2021/09/25 更新

写真a

ウエダ ヒロシ
植田 浩史
UEDA Hiroshi
所属
自然科学学域 准教授
職名
准教授
外部リンク

学位

  • 博士(工学) ( 早稲田大学 )

研究キーワード

  • 電磁界解析

  • 電気エネルギー工学(発生・変換・貯蔵・省エネルギーなど)

  • 超電導工学

  • 電気機器

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 電力工学

学歴

  • 早稲田大学   Graduate School of Science and Engineering  

    1999年4月 - 2004年3月

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    国名: 日本国

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  • 早稲田大学   School of Science and Engineering  

    1995年4月 - 1999年3月

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    国名: 日本国

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経歴

  • 岡山大学   学術研究院 自然科学学域   准教授

    2021年4月 - 現在

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    国名:日本国

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  • 岡山大学   大学院自然科学研究科   准教授

    2016年3月 - 2021年3月

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  • 大阪大学   核物理研究センター   特任助教

    2010年10月 - 2016年2月

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  • (財)国際超電導産業技術研究センター 超電導工学研究所   主任研究員

    2010年4月 - 2010年9月

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  • 早稲田大学   理工学術院   客員講師(専任扱い)

    2006年4月 - 2010年3月

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  • 早稲田大学   理工学術院   助手

    2003年4月 - 2006年3月

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所属学協会

委員歴

  • 電気学会   中国支部学会活動推進員  

    2020年4月 - 現在   

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    団体区分:学協会

  • 電気学会   中国支部学会活動推進員  

    2020年4月 - 現在   

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    団体区分:学協会

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  • 電気学会   全国大会グループ委員会 8グループ委員  

    2018年10月 - 現在   

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    団体区分:学協会

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  • 6th International Workshop on Numerical Modelling of High Temperature Superconductors   International Advisory Committee  

    2017年4月 - 2018年7月   

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    団体区分:学協会

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  • 電気学会   次世代高温超電導線材のコイル化技術調査専門委員会 委員  

    2015年4月 - 2018年3月   

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    団体区分:学協会

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  • 低温工学・超電導学会   International Workshop on Cooling system for HTS Applications, Local Committee  

    2015年2月 - 2015年11月   

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    団体区分:学協会

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  • 電気学会   イットリウム系高温超電導コイル化技術調査専門委員会 委員  

    2013年4月 - 2015年3月   

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    団体区分:学協会

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  • 電気学会   部門誌論文委員会(A1グループ)主査  

    2010年4月 - 2011年3月   

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    団体区分:学協会

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  • 低温工学・超電導学会   冷凍部会 庶務幹事  

    2009年5月 - 現在   

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    団体区分:学協会

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  • 電気学会「磁気力制御を利用した超電導技術の実用化と新たな展開」調査専門委員 委員  

    2009年4月 - 2011年3月   

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    団体区分:学協会

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  • 電気学会   A部門編修委員会 委員  

    2009年4月 - 2011年3月   

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    団体区分:学協会

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  • 電気学会   部門誌論文委員会(A1グループ) 副査  

    2009年4月 - 2010年3月   

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    団体区分:学協会

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  • 低温工学・超電導学会   冷凍部会 運営委員  

    2008年5月 - 現在   

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    団体区分:学協会

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  • NEDO   イットリウム系超電導電力機器技術開発 超電導電力貯蔵システム研究開発委員会 委員  

    2008年4月 - 2012年3月   

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    団体区分:その他

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  • NEDO   イットリウム系超電導電力機器技術開発 超電導電力ケーブル研究開発委員会 委員  

    2008年 - 2009年3月   

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    団体区分:その他

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  • 電気学会   部門誌論文委員会(A1グループ) 幹事  

    2007年4月 - 2008年3月   

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    団体区分:学協会

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  • 電気学会   超電導応用機器設計基礎技術調査専門委員会 幹事補  

    2004年4月 - 2006年3月   

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    団体区分:学協会

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  • 電気学会   論文誌編修専門第4部会 委員  

    2003年4月 - 2005年3月   

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    団体区分:学協会

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論文

  • Numerical evaluation of the deformation of REBCO pancake coil, considering winding tension, thermal stress, and screening-current-induced stress 査読 国際誌

    Hiroshi Ueda, Yuta Awazu, Keisuke Tokunaga, SeokBeom Kim

    Superconductor Science and Technology   34 ( 2 )   024003 - 024003   2021年2月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.1088/1361-6668/abcd24

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    その他リンク: https://iopscience.iop.org/article/10.1088/1361-6668/abcd24/pdf

  • Conceptual Design of Compact HTS Cyclotron for RI Production 査読 国際誌

    Hiroshi Ueda, Atsushi Ishiyama, So Noguchi, Tomonori Watanabe, Shigeo Nagaya, Jun Yoshida, Mitsuhiro Fukuda

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   29 ( 5 )   4101105   2019年8月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In autumn 2017, the project "Quantum Innovation for Safe and Smart Society (QiSS)" was started in Program on Open Innovation Platform with Enterprises, Research Institute and Academia (OPERA) by Japan Science and Technology Agency (JST). One of the key issues of this project is the advancement of compact cyclotron and beam irradiation device for stable supply of short-lived radioisotope (RI). We proposed the air-core cyclotron using high-temperature superconducting (HTS) technology, named Skeleton Cyclotron, as high intensity compact cyclotron. Currently, we are carrying out a feasibility study on a variable-energy multi-particle Skeleton Cyclotron for RI production. In this paper, key issues in HTS magnet technologies for Skeleton Cyclotron and the preliminary conceptual design of variable-energy multi-particle Skeleton Cyclotron are reported.

    DOI: 10.1109/TASC.2019.2903538

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  • Numerical Simulation on Magnetic Field Generated by Screening Current in 10-T-Class REBCO Coil 査読 国際誌

    Hiroshi Ueda, Yohei Imaichi, Tao Wang, Atsushi Ishiyama, So Noguchi, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   26 ( 4 )   4701205   2016年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In a REBCO superconducting magnet for magnetic resonance imaging (MRI) applications, the large screening current induced by a magnetic field perpendicular to the winding tape is a serious problem: it generates irregular magnetic field that deteriorates the spatial field homogeneity and temporal field stability in MRI applications. Therefore, we need to estimate the magnetic field generated by the screening current using electromagnetic field analysis to design and develop a REBCO magnet that generates highly accurate and stable magnetic field. Therefore, to examine the influence of the magnetic field generated by the screening current, we constructed cryocooler-cooled small bore-coil stacked pancake REBCO coils with an inner diameter of 50 mm. This coil generates a magnetic field of 10 T at the center. In this study, we report the evaluation of the current distribution and magnetic field in the REBCO coil using the developed 3-D numerical simulation code for electromagnetic field analysis in a REBCO tape using the finite-element method and fast multipole method. The numerical results agree well with the experimental results. Furthermore, we discuss the current distribution in the REBCO tape and the spatial and temporal behavior of the magnetic field on the basis of the results of the experiments and numerical simulation.

    DOI: 10.1109/TASC.2016.2535965

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  • Performance of Filters in Medical Protein Separation System Using Superconducting Magnet 査読 国際誌

    Hiroshi Ueda, Koh Agatsuma, Mitsuho Furuse, Shuichiro Fuchino, Kazuhiro Kajikawa, Yasuharu Kamioka, Tomohiro Iitsuka, Shuichi Nakamura

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   24 ( 3 )   3700405   2014年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Medical proteins such as monoclonal antibodies or immunoglobulin are important as medicine for cancer and other uses. Today, we can easily sort and analyze medical proteins using various types of commercially available affinity magnetic beads. However, separation systems for these medical proteins have a very low separation rate, and the cost of the product is extremely high. We successfully developed a high gradient magnetic separation system using a cryocooler-cooled low-temperature superconducting magnet and conducted experiments on separating affinity magnetic nanobeads. Our system demonstrated very high separation efficiency and can achieve low costs with a large production rate compared to systems now used in this field. The design of a filter to trap and recover the nanobeads is important to this application. In order to achieve a filter with a high trapping ratio of magnetic beads, the parameters need to be optimized because the ratio depends on the dimensions and arrangement of the filter made of fine magnetic metal fibers. In this study, we investigated the performance of filters in the high gradient magnetic separation system. The test results show 97.8% of the magnetic nanobeads in pure water were captured, and 94.1% of the total beads were collected.

    DOI: 10.1109/TASC.2013.2290374

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  • Numerical Evaluation on Electromagnetic and Thermal Stresses in Non-Circular REBCO Pancake Coils of Multi-Coil System For Skeleton Cyclotron 査読 国際誌

    Hiroshi Ueda, Yuta Miyake, Yuta Awazu, Ryota Inoue, SeokBeom Kim, So Noguchi, Tomonori Watanabe, Shigeo Nagaya, Mitsuhiro Fukuda, Atsushi Ishiyama

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   1 - 5   2021年8月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    We proposed the air-core cyclotron using high-temperature superconducting (HTS) technology, named Skeleton Cyclotron, as high intensity compact, variable-energy and multi-particle cyclotron for RI production. Skeleton Cyclotron consists of HTS split circular main coils generating the isochronous field and HTS non-circular sector coils generating the azimuthally varying field (AVF). Now, we are currently developing the small-scale cryocooler-cooled HTS coil system of Skeleton Cyclotron, which accelerates the proton up to energy of 5 MeV at an extraction radius of 20 cm. Skeleton cyclotron is multi-coil system consists of HTS split circular main NI (no-insulation) coils and HTS non-circular sector NI coils. Therefore, the electromagnetic, thermal, and mechanical behaviors are expected to be very complicated. In this study, the structure analysis based on finite element method using COMSOL Multiphysics is performed for a non-circular sector coil. The coils in Ultra-Baby Cyclotron are reinforced with YOROI-coil structure. Therefore, the effect of YOROI-coil structure was numerically investigated during cool-down process and excitation process. YOROI-coil structure is effective for non-circular sector coil against the electromagnetic force.

    DOI: 10.1109/tasc.2021.3072871

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  • Numerical Evaluation of Screening Current-Induced Magnetic Field Considering Variable Output Energy in REBCO Coil System of Skeleton Cyclotron for Cancer Therapy 査読 国際誌

    Takamitsu Ogata, Kodai Shirai, Atsushi Ishiyama, Hiroshi Ueda, So Noguchi, Tomonori Watanabe, Shigeo Nagaya, Mitsuhiro Fukuda

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   1 - 5   2021年8月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    We have been developing a new-generation accelerator named 'Skeleton Cyclotron', which is an ultra-compact and high-intensity accelerator for the stable production of 211At used for targeted alpha-particle therapy. Coil system for Skeleton Cyclotron consists of circular and noncircular high-temperature superconducting magnets and it can cause the output energy to vary without being bounded by the non-linearity of the iron core. This will enable not only the production of 211At, but also the production of radioisotopes for positron emission tomography and neutron irradiation for boron neutron capture therapy with a single accelerator. A high-precision magnetic field distribution and a high temporal stability are required for stable beam acceleration, but the screening current, which is induced in the REBa2Cu3Ox (REBCO, RE: Rare Earth) coated conductor, generates an irregular magnetic field and deteriorates the quality of the magnetic field spatially and temporally. In this study, we numerically evaluated the temporal stability and reproducibility of the screening current-induced field considering the variable energy operation for the Ultra-Baby Skeleton Cyclotron, which is a small demonstration model of Skeleton Cyclotron.

    DOI: 10.1109/tasc.2021.3059725

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  • Thermal Characteristics of REBCO Coil in a Wireless Power Transmission System for the Railway Vehicle in Liquid Nitrogen 査読 国際誌

    Ryota Inoue, Hiroshi Ueda, SeokBeom Kim, Makoto Tsuda

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   1 - 5   2021年8月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    A wireless power transmission (WPT) system using the high temperature superconducting (HTS) coil for a railway vehicle is required to transmit the electric power of several hundred kW in a short time (60 s). In order to design the WPT system using HTS coil with the thermal stability, and it is necessary to clarify the thermal characteristics of the HTS coil at the operating current in kHz band and the operating conditions considering thermal stability in the WPT system. We analyzed the frequency characteristics of the critical current in the HTS coil above 1 kHz and investigated the operating conditions considering thermal stability in the WPT system for the railway vehicle using HTS coil in liquid nitrogen. As a result, the critical current of the HTS coil in the kHz band decreased with the frequency. This is because the AC loss in the HTS coil increased with the frequency, and the critical current density of the HTS coil decreased with increasing the surface temperature. In order to design the HTS coil with thermal stability in the kHz band, and it is necessary to operate the HTS coil on alternating current less than about 50% of the critical current measured by direct current. We found that the thermally stable WPT system capable of fast charging for 60 seconds can be realized by operating current at the frequency of about 2 kHz.

    DOI: 10.1109/tasc.2021.3059234

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  • Numerical Evaluation of Thermal and Electromagnetic Stress in Frame-Reinforced Stacked REBCO Pancakes Coils 査読 国際誌

    Keisuke Tokunaga, SeokBeom Kim, Ryota Inoue, Hiroshi Ueda

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   4603505   2021年8月

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    To achieve high-field rare-earth barium copper oxide (REBCO) coils, the mechanism of the deterioration of or damage to such coils needs to be clarified. A REBCO coil experiences various stresses and strains during the winding, cooling down, charging, and discharging processes. Furthermore, the additional force and stress due to a screening current has become an issue in REBCO coils. To protect REBCO coils from large electromagnetic stress in a high field, a reinforcement structure called the Y-based oxide superconductor and reinforcing outer integrated (YOROI) coil was proposed. This study numerically evaluated the effect of the YOROI coil structures against thermal and electromagnetic stress using a two-dimensional axisymmetric structural analysis. This simulation considered the following: 1) the mechanical stress induced by 10 N of winding tension, 2) thermal stress during cooling from 300 K to 10 K, and 3) electromagnetic stress, which included the additional stress due to a screening current during the charging process. The mechanical behavior due to each process was investigated, and the effect of the YOROI structures was also examined.

    DOI: 10.1109/tasc.2021.3060702

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  • Numerical Evaluation of Screening Current-Induced Magnetic Field in No-Insulation REBCO Coil Systems 査読 国際誌

    Satomi Ueda, Atsushi Ishiyama, Hiroshi Ueda, So Noguchi

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   1 - 5   2021年8月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    We have been developing a no-insulation (NI) REBCO coil which is expected to be applied to medical accelerators and magnetic resonance imaging as a technology that can achieve both high thermal stability and high current density. Due to the flat shape and much greater, than the thickness, width of a REBCO-coated conductor, the screening currents are remarkably induced by changing the magnetic flux that penetrates the tape vertically. For insulated (INS) coils, this screening current causes an irregular magnetic field (screening current-induced magnetic field (SCIF)). Also, in the NI coil, an excitation delay occurs because of the current flowing in the radial direction with coil excitation. Therefore, as the cause of irregular magnetic field, it is necessary to simultaneously consider the influence of both the excitation delay and SCIF. In this study, we numerically investigate the magnetic field in the NI coil. The SCIF and an excitation delay reduce magnetic accuracy in the NI coil. Thus, we propose an energization waveform that can improve the magnetic field accuracy even if there is an excitation delay. Besides, we verified its effectiveness.

    DOI: 10.1109/tasc.2021.3064540

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  • Study on the Current Bypassing and Mechanical Properties of No-Insulation HTS Coil With Protection Ring 査読 国際誌

    Daisuke Nishikawa, Kohei Miyamoto, Hirotaka Kobayashi, Ryota Inoue, Hiroshi Ueda, SeokBeom Kim

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   4603405   2021年8月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    We have been studying no-insulation (NI) high temperature superconducting (HTS) coils that do not use turn-to-turn electrical insulation. The no-insulation winding technique can provide high stability of the HTS coils against the quenching, but it cannot prevent mechanical deterioration of the HTS coil due to electromagnetic force and multiple cooling. To solve these problems, we propose the installation of metal protection ring on the outermost turn of NI HTS coil to improve thermal, mechanical, and electrical stability. In this study, the current bypass characteristics in the transverse direction within an NI test coil wound with 37 turns of REBCO wire with/without copper protection ring were experimentally investigated for various amounts of heating by a heater and various heater positions. Eight repeated cooling experiments with liquid nitrogen proved that the proposed copper protection ring was effective against shape deformation of the NI test coil and deterioration of contact resistance between turns due to thermal stress.

    DOI: 10.1109/tasc.2021.3063654

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  • Performance of Epoxy-Impregnated Intra-Layer No-Insulation (LNI) REBCO Coils at 77 K 査読 国際誌

    Taisuke Yoshida, Yu Suetomi, Keisuke Takahashi, Tomoaki Takao, Yoshinori Yanagisawa, Hideaki Maeda, Hiroshi Ueda

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   2021年8月

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    掲載種別:研究論文(学術雑誌)  

    The intra-layer no-insulation (LNI) method is effective for protecting a layer-wound REBCO coil from a quench. However, a recently reported hoop stress modification (both increase and decrease) due to screening currents is a potential problem causing conductor degradation during charging. Epoxy impregnation can suppress the hoop stress modification and in this work, we develop prototypes of epoxy-impregnated LNI-REBCO coils to be charged at 77 K. Degradation of the coil performance due to cooling down can be prevented by mechanically isolating each layer. The coil shows a reasonably short field delay and current bypassing behavior, which are major technical benefits of the LNI-REBCO coil. A structural analysis with screening current-induced electromagnetic forces qualitatively suggests that the epoxy-impregnated LNI-REBCO coil can support a compressive hoop stress which causes conductor degradation due to buckling. The tensile hoop stress, however, is still very high at the upper and lower ends of each layer, causing fracture of a superconducting layer; i.e., additional reinforcement is required.

    DOI: 10.1109/TASC.2021.3065875

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  • Numerical Analysis of the Reduction of Screening-Current-Induced Magnetic Field in Copper-Plated and Striated REBCO-Coated Conductor Wound into Pancake Coils 査読 国際誌

    Hinako Ishizaki, Satomi Ueda, Takamitsu Ogata, Atsushi Ishiyama, Hiroshi Ueda, So Noguchi

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   2021年8月

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    掲載種別:研究論文(学術雑誌)  

    We aim to develop REBCO coil systems for high-magnetic-field whole-body magnetic resonance imaging and medical cyclotron for cancer therapy. These applications require high temporal stability and spatial uniformity of the generated magnetic field. Although the magnetic field generated during excitation changes very slowly, a screening-current-induced magnetic field (SCIF) is generated, which affects the required accuracy of the magnetic field. To reduce the SCIF, we focus on two methods: 1) a current control method, and 2) the use of striated coated conductors. When adopting a striated coated conductor, it is necessary to plate copper onto it in order to maintain its thermal stability and mechanical strength. However, in the copper-plated layer, changes in the magnetic field induce a coupling current, which flows between the filaments of the REBCO coated conductor. In this study, we apply the overshoot method with a plateau as a current control to eliminate the effect of coupling currents in the copper plating layer. We numerically analyzed the effectiveness of this overshoot method by visualizing the changes in the current distributions in a model pancake coil wound with a REBCO-coated conductor separated into two filaments. For that purpose, we used a three-dimensional nonlinear transient electromagnetic field computation in which the spiral arrangement of the pancake coil windings is appropriately considered.

    DOI: 10.1109/TASC.2021.3073634

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  • Turn-to-Turn Contact Resistance Measurement of No-Insulation REBCO Pancake Coil: External Field Dependence 査読 国際誌

    So Noguchi, Shunpei Mori, Takanobu Mato, Takahiro Tatsuta, Daisuke Nishikawa, Kohei Miyamoto, Ryota Inoue, Hiroshi Ueda, Seokbeom Kim

    IEEE Transactions on Applied Superconductivity   31 ( 5 )   2021年8月

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    掲載種別:研究論文(学術雑誌)  

    The characteristics of no-insulation high-temperature superconducting (HTS) manet is dominated by the magnitude of the turn-to-turn contact resistance. A few techniques have been proposed to increase the turn-to-turn contact resistance. The relation between the turn-to-turn contact resistance and the magnet stability has also been investigated in simulations. Although the turn-to-turn contact resistance measurement was only the sudden-discharging method before, we proposed a low-frequency-AC current (LFAC) method. Using our proposed method, it is possible to measure the turn-to-turn contact resistance under various conditions. In a previous paper, we measured it when charging DC current to a single pancake coil. In this paper, the turn-to-turn contact resistance was measured by the LFAC method when an external field of 1-3 T was applied to a single pancake coil. The coil strain was also measured, and the relation of the turn-to-turn contact resistance and the coil strain was also discussed.

    DOI: 10.1109/TASC.2021.3070232

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  • Influence of Coil Size and Operating Temperature on the Transient Stability of a Multi-Stacked No-Insulation REBCO Pancake Coil System 査読 国際誌

    H. Onoshita, Y. Yoshihara, H. Ueda, S. Noguchi, A. Ishiyama

    IEEE Transactions on Applied Superconductivity   30 ( 4 )   4702605   2020年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Study on the Effect of Metal Protection Rings in No-Insulation HTS Coils 査読 国際誌

    SeokBeom Kim, Takahiro Tatsuta, Daisuke Nishikawa, Kohei Miyamoto, Hiroshi Ueda

    IEEE Transactions on Applied Superconductivity   30 ( 4 )   1 - 4   2020年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2020.2976066

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  • Turn-to-Turn Contact Resistance Measurement of No-Insulation REBCO Pancake Coil at DC Current Operation 査読 国際誌

    So Noguchi, Takahiro Tatsuta, Daisuke Nishikawa, Hiroshi Ueda, SeokBeom Kim

    IEEE Transactions on Applied Superconductivity   30 ( 4 )   1 - 5   2020年6月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2020.2970381

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  • Design and Trial Production of Magnetic Filter for Medical Protein Screening System using High Gradient Magnetic Separation 査読 国際誌

    M. Mori, M. Kubota, T. Abe, S.B. Kim, H. Ueda

    Journal of Physics: Conf. Series   1293   012081   2019年10月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Turn-to-Turn Contact Resistance Measurement of No-Insulation REBCO Pancake Coils 査読 国際誌

    S. Noguchi, R. Miyao, H. Okusa, T. Tatsuta, H. Ueda, SB. Kim

    IEEE Transactions on Applied Superconductivity   29 ( 5 )   4601605   2019年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1109/TASC.2019.2903643

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  • A simple screening current-induced magnetic field estimation method for REBCO pancake coils 査読 国際共著 国際誌

    S. Noguchi, H. Ueda, S. Hahn, A. Ishiyama, Y. Iwasa

    Superconductor Science and Technology   32 ( 4 )   045007   2019年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1088/1361-6668/aafe26

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  • REBCOコイルにおける遮蔽電流不整磁場の抑制効果解析 ‐ 9.4 T 級ヒト全身用MRI コイルを対象として ‐ 査読

    伊東 慶太, 植田 浩史, 野口 聡, 石山 敦士

    低温工学   54 ( 2 )   119 - 126   2019年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2221/jcsj.54.119

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  • Numerical Simulation on Coupling Current for Multifilamentary HTS Wire 査読 国際誌

    T. Koizumi, E. Morikawa, SB. Kim, H. Ueda

    Journal of Physics: Conf. Series   1054   012039   2018年6月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1088/1742-6596/1054/1/012039

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  • Numerical Simulation on Behaviour of Magnetic Beads in Magnetic Filter for Medical Protein Screening System using High Gradient Magnetic Separation 査読 国際誌

    M. Kubota, Y. Mori, SB. Kim, H. Ueda

    Journal of Physics: Conf. Series   1054   012085   2018年6月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1088/1742-6596/1054/1/012085

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  • Development of HTS Bulk NMR Relaxometry with Ring-Shaped Iron 査読 国際誌

    Seokbeom Kim, Susumu Fukada, Ryota Nomura, Hiroshi Ueda

    IEEE Transactions on Applied Superconductivity   28 ( 3 )   4301205   2018年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers Inc.  

    The compact NMR magnets consisted of the stacked higherature superconducting (HTS) GdBCO bulk annuli trapped by field cooling (FC) method have been developed. The target values of strength and homogeneity of magnetic field for proposed NMR relaxometry are 1.5 T and 150 ppm/cm3, respectively, at liquid nitrogen temperature. Since last year, we have been developing a hardware and software to detect the NMR signals by ourselves. Therefore, we needed to determine the final structure of HTS bulk magnet to be used in the NMR relaxometry. We can obtain the trapped magnetic field over 1.5 T at 77.4 K experimentally. However, it is still difficult to obtain the magnetic field homogeneity under 150 ppm/cm3 experimentally, due to their different superconducting properties. Therefore, in this study, four types of HTS bulk magnets to determine the final structure of compact NMR relaxometry were designed and their field properties including the degraded HTS bulk were investigated using three-dimensional finite-element method analysis. The field properties of 10-stacked HTS bulk magnets with the ring-shaped irons for field compensation and the degraded HTS bulk were investigated experimentally.

    DOI: 10.1109/TASC.2017.2785260

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  • Current bypassing and transient stability in a partially insulated HTS coil 査読 国際誌

    SeokBeom Kim, Haruyoshi Okusa, Kentaro Tami, Hiroshi Ueda

    IEEE Transactions on Applied Superconductivity   28 ( 3 )   4603105   2018年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers Inc.  

    The no-insulation (NI) winding technique to improve the transient stability of high-temperature superconducting (HTS) magnets has been studied and a cowinding method using a metallic tape was tested. Normally, the operating current in NI HTS coils is bypassed into the transverse direction due to the normal region generated within the coils. Therefore, a method that controls such current bypassing into the turn-to-turn direction of NI HTS coils was investigated as a means to regulate the effective number of turns. In this study, we experimentally investigated the characteristics of current bypassing in the transverse direction within a test coil wound with a GdBCO tape. First, to find an optimized heater location, a 20-turn HTS pancake with two partial insulation shapes was prepared and tested experimentally. The current bypassing characteristics in the normal region created by heaters (strain gauges) were studied while varying the number of heaters, heater positions, and the amount of heating at liquid nitrogen temperature. Using both short and long heating periods, we found that we could effectively control the number of turns (coil inductance) via long-duration heating.

    DOI: 10.1109/TASC.2017.2787108

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  • An Extended Thin Approximation Method to Simulate Screening Current Induced in REBCO Coils 査読 国際共著 国際誌

    So Noguchi, Seungyong Hahn, Hiroshi Ueda, Seokbeom Kim, Atsushi Ishiyama

    IEEE Transactions on Magnetics   54 ( 3 )   7201904   2018年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers Inc.  

    Superconducting magnets wound with second-generation high-temperature superconductors, i.e., REBa2Cu3O7-x (REBCO, RE = Rare Earth) tapes, are desired to apply high magnetic field nuclear magnetic resonance, MRI, and accelerators. However, a major problem for practical application is an undesirable irregular magnetic field caused by screening currents induced in REBCO tapes. To investigate the screening current-induced magnetic field, a few simulation methods have been proposed. One of the effective simulation methods employs a finite-element method with a thin approximation method. Although the thin approximation method was developed to simulate eddy currents in magnetic steel sheets, and it is not applicable to REBCO tapes carrying a transport current. Therefore, the thin approximation method is extended to simulate screening currents in REBCO tapes considering a carrying transport current. To show the validity of the proposed extended thin approximation method, the screening currents of an REBCO magnet are computed, and the results are compared with the measurement and simulation results of the conventional thin approximation method. The more accurate solution is available by using the proposed methods.

    DOI: 10.1109/TMAG.2017.2752083

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  • Study on the Persistent Current Switch in HTS Coils Wound with 2G Wire for Compact NMR Magnets 査読

    K. Sugo, S. B. Kim, R. Nomura, H. Ueda

    Journal of Physics: Conference Series   871 ( 1 )   2017年7月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Institute of Physics Publishing  

    High temperature superconducting (HTS) magnets wound with REBCO wires are used in many applications, and the superconducting magnet which is operated in persistent current mode has many advantages. Therefore, we have been developing compact NMR relaxometry devices using HTS coils operated at liquid nitrogen temperature. The required strength and homogeneity of magnetic field of proposed NMR relaxometry devices are 1.5 T and 150 ppm/cm3 respectively. The proposed HTS magnet for NMR relaxometry device consists with stacked HTS double pancake coils wound with REBCO wires and operated by persistent current mode (PCM) using superconducting joint between REBCO wires. In PCM operation, the ability of persistent current switch (PCS) is very important, so, in this study, the thermal properties of YBCO wire against the various thermal inputs by heater were investigated experimentally to design the PCS for PCM HTS magnets. The thermal behaviors of the YBCO wires were measured as functions of amount of heat input using two types of epoxy resin. The current bypassing properties on the YBCO loop coil with developed PCS were studied experimentally.

    DOI: 10.1088/1742-6596/871/1/012087

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  • Current Behavior Simulation in Stacked NI REBCO Pancake Coils during Local Normal-State Transition 査読

    So Noguchi, Ryosuke Miyao, Katsutoshi Monma, Hajime Igarashi, Hiroshi Ueda, Atsushi Ishiyama

    IEEE Transactions on Applied Superconductivity   27 ( 4 )   4603205   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers Inc.  

    This paper presents the current behavior and axial Lorenz force of stacked no-insulation (NI) REBa2Cu3O7-x (REBCO, RE = Rare Earth) double-pancake coils during local normal-state transition. The NI winding technique enhances the thermal stability and increases the engineering current density in REBCO pancake coils. The high thermal stability of NI REBCO coil has been verified in experiments of overcurrent test. In addition, the numerical simulations of NI REBCO single-pancake coils have been performed to confirm the high stability. However, REBCO magnets usually consist of some stacked double-pancake coils to generate a high magnetic field for practical applications. When a normal-state transition occurs in one of the stacked pancake coils, it may affect the other pancake coils. For the more reliable verification, the current and electromagnetic force behavior of stacked NI REBCO pancake coils during a normal-state transition should be simulated. To examine the stacked NI REBCO pancake coils, we extend the previously proposed partial element equivalent circuit (PEEC) model to deal with a few double-pancake coils. In this paper, an NI REBCO double-pancake coil and their three stacked coils are simulated by using the extended PEEC model.

    DOI: 10.1109/TASC.2017.2656381

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  • Numerical Evaluation of the Reinforcing Effect of the Advanced YOROI Coil Structure for the HTS Coil 査読

    Yuji Kashiwazaki, Atsushi Ishiyama, Xudong Wang, Hiroshi Ueda, Tomonori Watanabe, Shigeo Nagaya

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   27 ( 4 )   4601804   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    REBCO coils applied to superconducting magnetic energy storage system, magnetic resonance imaging, medical accelerator, and so on, are expected to result in high efficiency and compactness due to the realization of higher magnetic field and current density. Because these devices require large coil radius, huge hoop stress "BJR" (= magnetic field x current density x coil radius) is produced in the coil winding and the damage to these devices is likely to cause. In our previous study, we proposed a novel coil structure called the Y-based oxide superconductor and reinforcing outer integrated (YOROI) structure to achieve a highstrength REBCO pancake coil. The YOROI structure comprises upper and lower plates and the outer frame of the winding outer periphery. The frames are forcibly expanded by the superconducting coil winding situated inside when the coil winding is subjected to an electromagnetic force. The outer frame is connected to the upper and lower plates and transfers a part of the electromagnetic force from the coil winding to the reinforcing outer plates. The reinforcing outer plates then support the coil to suppress the coil deformation against the electromagnetic forces. The YOROI structure achieved the resistance to a maximum hoop stress of 2 GPa, which was calculated from the BJR in an excitation test at 4.2 K in 8-T backup fields. In this study, we investigated the effect of the stress control structure to realize the HTS coil with a mechanical strength of over 2 GPa using a three-dimensional finite-element structural analysis.

    DOI: 10.1109/TASC.2017.2652918

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  • Progress in the Development of Conduction-Cooled REBCO Magnets for Ultrahigh-Field MRI Systems 査読

    Hiroshi Miyazaki, Sadanori Iwai, Tatsuro Uto, Yasumi Otani, Masahiko Takahashi, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shin-ichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   27 ( 4 )   4300805   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We started developing REBa2Cu3O7-delta (REBCO) magnets for ultrahigh-field magnetic resonance imaging (MRI) systems in 2013. Our final targets are 9.4 TMRI systems for whole-body and brain imaging. In this paper, a conduction-cooled 1.5 T REBCO MRI magnet having a room-temperature bore of 396 mm was fabricated and tested in order to evaluate the magnetic field homogeneity and stability. The magnet was composed of 60 single pancakes whose inner diameter was 500 mm. The total conductor length was 10.3 km, and the total inductance was 12.4 H. The size of the homogeneous magnetic field region was 200 mm diameter spherical volume. The central magnetic field was as high as 1.5 T at 192.7 A, and the current density of single pancakes was 301 A/mm(2). The magnet was cooled from room temperature to 4.7 K in 55 hours, and the temperature difference among the coils was 0.1 K or less during both initial cooling and excitation. The magnetic field inhomogeneity was 249.7 parts per million (ppm), and the Z(2) coefficient was largest at 579.6 ppm. The main reason for the error magnetic field was dimensional errors in the positions on the z-axis. The magnetic field inhomogeneity was improved to 4.1 ppm by passive shimming using iron pieces. The magnetic field stability was about 2 ppm/h because of a reduction in screening-current induced in the REBCO-coated conductors. Current sweep reversal improved the magnetic field stability from 2 ppm/h to 0.8 ppm/h.

    DOI: 10.1109/TASC.2017.2656858

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  • Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound With REBCO-Coated Conductors 査読

    Hiroshi Miyazaki, Sadanori Iwai, Tatsuro Uto, Yasumi Otani, Masahiko Takahashi, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shin-Ichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   27 ( 4 )   4701705   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Superconducting magnets for magnetic resonance imaging systems require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coils shape and positions. Furthermore, in REBa2Cu3O7-delta (REBCO) magnets, the screening-current-induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the most critical issues. In the work described here, a small REBCO coil that can generate a magnetic field of over 10 T was fabricated and tested. The small REBCO coil was composed of a stack of 22 single pancake coils whose inner and outer diameters were 50 mm and 130 mm, respectively. The total conductor length was 1.5 km. The small REBCO coil could generate a central magnetic field of 8.27 T at 10 K. A magnetic field of over 10 T was achieved by replacing 12 of the single pancake coils with new ones wound with the latest REBCO-coated conductors. The measured value of the central magnetic field at 10 K was 13.53 T, which was lower than the calculated value of 13.94 T obtained without taking account of the screening-current-induced magnetic field. Furthermore, it was examined whether the current sweep reversal would be effective for 10 T-class magnetic field conditions.

    DOI: 10.1109/TASC.2017.2657636

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  • Numerical Evaluation on Irregular Field Generated by Screening Current in High-Field REBCO Coil for Whole-Body MRI 査読

    Kohei Nakazono, Hiroshi Ueda, Atsushi Ishiyama, So Noguchi, Hiroshi Miyazaki, Taizo Tosaka, Tsutomu Kurusu, Shunji Nomura, Shinichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   27 ( 4 )   4400405   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In recent years, high-field magnets wound with RE-BCO tape and their applications to magnetic resonance imaging (MRI) have undergone considerable research and development. MRI coil systems require a highly accurate field in the imaging space. However, in REBCO coils, the irregular magnetic field generated by the screening current is induced by the radial component of the magnetic field in the REBCO tape, and may deteriorate the field quality both spatially and temporally. Therefore, a design process with consideration for the effect of the screening-current field is required for the reduction and correction of this field for a high-accuracy-field REBCO coil. In this study, the screening-current distribution in the REBCO tape and the irregular magnetic field were analyzed by using the simulation we developed for a REBCO model coil system for whole-body MRI. We additionally discuss the effect of the screening-current field in the REBCO coil based on the coil shape and arrangement to use it as feedback to the design stage.

    DOI: 10.1109/TASC.2016.2645839

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  • Loss Measurement in a Cryogen-Free Bi-2223 HTS Dipole Magnet for Beam Line Switching 査読

    Jun Yoshida, Takaaki Morie, Atsushi Hashimoto, Hitoshi Mitsubori, Yukio Mikami, Keiichi Watazawa, Kichiji Hatanaka, Hiroshi Ueda, Mitsuhiro Fukuda, Tetsuhiko Yorita

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   27 ( 4 )   4701905   2017年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    High-temperature superconducting (HTS) magnets have several advantages for ac and pulse operation due to having a high critical temperature. However, fast magnetic field changes generate severe ac losses and eddy current losses. Therefore, loss estimation and reduction is a significant issue for HTS magnet cooling design. For future cooling design, we have measured losses of a Bi-2223 HTS magnet for beamline switching in the cyclotron facility at the Research Center of Nuclear Physics, Osaka University. The time-varying magnetic field losses for triangular wave excitation with a perpendicular magnetic field amplitude of 0.8 T in wire and a minimum period of 42 s were obtained from measured cryocooler temperatures and preliminary measured cooling capacity curve. The eddy current losses of the metal components were calculated using transient electromagnetic finite element analysis. The ac losses of the Bi-2223 wire were derived from the measured time-varying magnetic field losses and the calculated eddy current losses. The frequency dependence of their losses indicates the importance of accurate evaluation and reduction of the eddy current losses for the future magnet with higher charging speed.

    DOI: 10.1109/TASC.2017.2653222

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  • Design of a conduction-cooled 9.4T REBCO magnet for whole-body MRI systems 査読

    Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    SUPERCONDUCTOR SCIENCE & TECHNOLOGY   29 ( 10 )   104001   2016年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    A project on the development of REBa2Cu3O7-delta (REBCO) magnets for ultra-high-field magnetic resonance imaging (MRI) was started in 2013. Since REBCO-coated conductors feature high mechanical strength under tensile stress and high critical current density, use of REBCO coils would allow superconducting magnets to be made smaller and lighter than conventional ones. In addition, a conduction-cooled superconducting magnet is simpler to use than one cooled by a liquid helium bath because the operation and maintenance of the cryogenic system become simpler, without the need to handle cryogenic fluid. Superconducting magnets for MRI require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coil shape and position. Moreover, in REBCO magnets, the screening-current- induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the critical issues. In order to evaluate the magnetic field homogeneity and the screening-current- induced magnetic field, a 1 T model magnet and some test coils were fabricated. From an evaluation of the 1 T model magnet, it was found that the main reason for magnetic field inhomogeneity was the tolerances in the z-axis positions of the coils, and therefore, it is important to control the gap between the single pancakes. In addition, we have already demonstrated the generation of an 8.27 T central magnetic field at 10 K with a small test coil. The screening-current-induced magnetic field was 0.43 T and was predictable by using an electromagnetic field simulation program. These results were reflected in the design of a conduction-cooled 9.4 T REBCO magnet for whole-body MRI systems. The magnet was composed of six main coils and two active shield coils. The total conductor length was 581 km, and the stored energy was 293 kJ. The field inhomogeneity was 24 ppm peak to peak and 3 ppm volume-root-mean-square (VRMS) for a 500 mm diameter spherical volume (DSV). The axial and radial 5 gauss line locations were less than 5 m and 4.2 m respectively.

    DOI: 10.1088/0953-2048/29/10/104001

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  • Developments of HTS Magnets towards Application to Accelerators

    K. Hatanaka, M. Fukuda, K. Kamakura, H. Ueda, Y. Yasuda, T. Yorita

    Proceedings of the 7th International Particle Accelerator Conference   1180 - 1182   2016年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.18429/JACoW-IPAC2016-TUPMB035

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  • Development of a Rapid Beam Emittance Measurement System using a Real-Time Beam Profile Monitor 査読

    Keita Kamakura, Kichiji Hatanaka, Mitsuhiro Fukuda, Tetsuhiko Yorita, Hiroshi Ueda, Takane Saito, Shunpei Morinobu, Keiichi Nagayama, Hitoshi Tamura, Yuusuke Yasuda

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   63 ( 3 )   1710 - 1714   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have developed a rapid beam emittance measurement system for the injection beam of the K140 azimuthally varying field (AVF) cyclotron at Research Center for Nuclear Physics (RCNP). So far, a conventional emittance monitor has been used in a section of a medium energy beam transport (MEBT) system to evaluate the quality of the injected beam to the K400 ring cyclotron. Two kinds of emittance monitors were supplemented in the low energy beam line for evaluation of ion beams from ion sources. One of them is a conventional type consisting of two sets of position-variable slits and a three-wire profile monitor (TPM), similar to the one installed in the MEBT system of the AVF cyclotron. It takes about 30 min to get emittances in both the horizontal and vertical planes. For quick emittance measurements, we have developed a new system equipped with a set of fast moving slits with a fixed gap and a real-time beam profile monitor (BPM83) with a rotating helical wire. With this system the measurement time was considerably reduced to 70 s for both the horizontal and vertical emittances. Moreover the data analysis and graphical processing were completely automated. The overall measurement and analysis time was successfully minimized within 75 s. This rapid emittance measurement system has contributed to improve the beam quality by optimizing parameters of ion sources and the beam transport system.

    DOI: 10.1109/TNS.2016.2542865

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  • Experiment and Simulation of Impregnated No-Insulation REBCO Pancake Coil 査読

    So Noguchi, Katsutoshi Monma, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   26 ( 4 )   4601305   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    It is important to investigate the stability and behavior of an epoxy-resin-impregnated no-insulation (NI) REBCO pancake coil to implement high-field applications, such as ultra-high-field magnetic resonance imaging. We have performed sudden discharging and overcurrent tests for the impregnated NI REBCO pancake coil. From the discharging test, the contact resistivity is estimated, and it changes depending on the initial current. From the overcurrent test, the high thermal stability of the impregnated NI REBCO pancake coil is confirmed. The REBCO pancake coil is charged up to 67 A though the critical current is only 46 A, and no degradation has been found. To investigate in detail the electromagnetic behavior of an impregnated NI REBCO pancake coil, the simulation is performed by means of the partial element equivalent circuit (PEEC) model. In the sudden discharging test, the simulation results for the case of lower initial current are in good agreement with the experimental data. As can be inferred from the simulation results, the current drastically decreases from the inside of the impregnated NI REBCO pancake coil. The result of the overcurrent simulation is almost identical to the experimental one. However, since the contact resistivity is presumed to be constant in the simulation, the difference is observed in the high current region.

    DOI: 10.1109/TASC.2016.2536736

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  • R&D Project on HTS Magnets for Ultrahigh-Field MRI Systems 査読

    Taizo Tosaka, Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   26 ( 4 )   4402505   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    An R&D project on high-temperature superconducting (HTS) magnets using (RE) Ba2Cu3O7 (REBCO; RE = rare earth) wires for ultrahigh-field (UHF) magnetic resonance imaging (MRI) systems is described. Our targets are 9.4-T MRI systems for whole-body imaging and brain imaging. REBCO wires are promising components for UHF-MRI because REBCO wires have high critical current density in high magnetic fields and high strength against hoop stresses, which allows MRI magnets to be smaller and lighter than conventional ones. The aim of the project is to establish basic magnet technologies for adapting REBCO coils for UHF-MRI. The project term is three years, and this year is the final year. We have already demonstrated the generation of an 8.27-T magnetic field with a small test coil composed of 22 REBCO pancake coils. A magnetic field spatial distribution with inhomogeneity of several hundreds of parts permillion within 100-mm diameter spherical volume (DSV) was demonstrated with a 1-T model magnet. A stable magnetic field of a few parts per million per hour was also demonstrated with the 1-T model magnet. The targets of the project, to be achieved by March 2016, are to demonstrate the generation of a 9.4-T field with the small REBCO coil, and to demonstrate a homogeneous magnetic field in 200-mm DSV with a 1.5-T magnet having three pairs of split coils. Imaging will be performed with the 1.5-T magnet.

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  • Evaluation of Irregular Magnetic Field Generated by Screening Current in REBCO Coils for High Accuracy Field 査読

    Ayako Matsumi, Hiroshi Ueda, So Noguchi, Tao Wang, Atsushi Ishiyama, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   26 ( 4 )   4702305   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In recent years, research and development of applications for a high field magnet wound with a REBCO tape into nuclear magnetic resonance and magnetic resonance imaging have been carried out. These applications require a very high accuracy field, that is, the spatial uniform and temporally stable field. However, in the REBCO coils, the irregular magnetic field is generated by the screening current, which is remarkably induced by the radial component of the magnetic field in a REBCO tape. Therefore, a nonconventional approach is required for the reduction or correction of the irregular magnetic field generated by the screening current in the stage of design for a high-accuracy-field REBCO coil. The prediction and improvement of the irregular magnetic field generated by the screening current is a serious issue for the development and design of REBCO coils and correction shims. In this study, we numerically investigated the screening current distribution in the winding and the irregular magnetic field generated by the screening current. Moreover, we discuss the irregular effect of the magnetic field generated by the screening current in the REBCO coil from the arrangement of the coil windings and excitation pattern.

    DOI: 10.1109/TASC.2016.2535966

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  • Evaluation of Magnetic Field Distribution by Screening Current in Multiple REBCO Coils 査読

    Ayumu Mochida, Hiroshi Ueda, So Noguchi, Tao Wang, Atsushi Ishiyama, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   26 ( 4 )   4702805   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Coil systems are fabricated with various combinations of multiple coils in order to generate homogenous fields for NMR and MRI applications. In multiple coil systems using REBCO coils, the behavior of the screening current, which deteriorates field homogeneity, depends on the patterns of the transport current, the charging sequence of the coils, and the various resulting magnetic fields. It is therefore important to investigate and clarify the behavior of the irregular magnetic field and screening current in multiple coil systems under different operating environments. In a previous study, we experimentally and numerically clarified the different behaviors of irregular magnetic fields based on the charging sequence of coils in multiple-model REBCO coils [1], [2]. In this paper, we constructed the multiple-model REBCO coils in order to obtain the fundamental data for reducing or improving the resulting irregular magnetic field. Furthermore, the distribution of the irregular magnetic field in terms of the screening current was measured by using the reversal current method [3], [4]. We also calculated the spatial and temporal behavior of the irregular magnetic field by using our developed 3-D numerical simulation. Based on the experimental and numerical results, we discuss the behavior of the magnetic field in terms of the screening current when using the current sweep reversal method in multiple-model REBCO coils.

    DOI: 10.1109/TASC.2016.2542980

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  • Experimental Results of Screening-Current Field With 10-T Class Small REBCO Coil 査読

    S. Iwai, H. Miyazaki, Y. Ohtani, T. Tosaka, K. Tasaki, S. Nomura, T. Kurusu, H. Ueda, S. Noguchi, A. Ishiyama, S. Urayama, H. Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   26 ( 4 )   4302305   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    A REBCO-coated conductor has a tape shape and is suitable for forming a stack of single pancakes for generating a high magnetic field. However, the magnetic flux going through the tape surface causes a screening current, which reduces the magnetic field in conventional coil designs. Magnetic resonance imaging systems need high uniformity of the magnetic field, both spatially and temporally, and thus, the screening field resulting from the screening current is one of the critical issues. In this paper, a 10-T class small test coil using REBCO-coated conductors was fabricated and tested in a conduction-cooled configuration from 10 to 60 K for investigating the effect of the screening field on the generated magnetic field in the inner space of the coil. The coil was composed of a stack of 22 single pancakes using 4-mm-wide REBCO tapes with an inner diameter of 50 mm, an outer diameter of 129 mm, and a height of 104 mm. For different stacking orders based on the coil critical currents, the measured values of the central magnetic field at 10 K were 7.66 and 8.27 T, which were lower than the calculated values of 8.07 and 8.70 T obtained without taking account of the screening-current fields.

    DOI: 10.1109/TASC.2016.2530301

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  • Performance Test of Cryogen-Free Bi-2223 HTS Dipole Magnet for Beam Line Switching 査読

    Jun Yoshida, Atsushi Hashimoto, Hitoshi Mitsubori, Yukio Mikami, Keiichi Watazawa, Kichiji Hatanaka, Hiroshi Ueda, Mitsuhiro Fukuda, Tetsuhiko Yorita, Eisaku Ueno, Takeshi Kato

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   26 ( 3 )   4005004   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have developed a Bi-2223 high-temperature superconducting dipole magnet for beam line switching at the cyclotron facility of the Research Center for Nuclear Physics, Osaka University. Exit beam lines are periodically switched by increasing and decreasing the magnetic field between 0 and 1.6 T with a switching time of 10 s. The magnet is equipped with two sets of Bi-2223 coil assemblies, which are conduction cooled by two 10-K Gifford-McMahon cryocoolers. We evaluated the superconducting property of the Bi-2223 coil assemblies in liquid nitrogen before installation in the cryostat. There were no degradation in wire performance during the assembly process. Magnetic field, strains, and temperatures of the coil assembly were investigated for performance verification after the magnet fabrication. The magnetic field and the temperatures meet specifications, and the deformation of the coil assembly is considered to be successfully suppressed by reinforcing structure. Furthermore, from a viewpoint of temperature, it is indicated that the magnet can make switching time and cycle time faster than that of the specified operation.

    DOI: 10.1109/TASC.2016.2528543

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  • Evaluation of Magnetic Field Homogeneity of a Conduction-Cooled REBCO Magnet With a Room-Temperature Bore of 200 mm 査読

    H. Miyazaki, S. Iwai, Y. Otani, M. Takahashi, T. Tosaka, K. Tasaki, S. Nomura, T. Kurusu, H. Ueda, S. Noguchi, A. Ishiyama, S. Urayama, H. Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   26 ( 3 )   7414412   2016年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Development of a high-temperature superconducting magnet wound with REBa2Cu3O7-delta (REBCO)-coated conductor for ultrahigh-field magnetic resonance imaging (MRI) is in progress. Our final targets are 9.4-T MRI systems for whole-body and brain imaging. Since REBCO-coated conductors feature high mechanical strength under a tensile stress and high critical current density, superconducting magnets could be made smaller by using REBCO coils. Superconducting magnets for MRI require homogeneous stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the size and current density of the coils. Furthermore, in REBCO magnets, the screening-currentinduced magnetic field that changes the magnetic field distribution of the magnet is one of the critical issues. In order to evaluate the magnetic field homogeneity and the screening-current-induced magnetic field of REBCO magnets, a conduction-cooled REBCO magnet with a room-temperature bore of 200 mm was fabricated and tested. The REBCO coils were composed of 12 single pancakes, and the size of the homogeneous magnetic field region was 100-mm diameter spherical volume (DSV). The central magnetic field was as high as 1 T at 285 A. The magnetic field distribution on the z-axis was measured by using an NMR probe. The maximum error magnetic field was 470 parts per million (ppm) in the range from -50 to +50 mm, as well as in the coefficients of the spherical harmonic expansion for a 100-mm DSV. The error magnetic fields due to the screening-current-induced magnetic field were less than 5 ppm, because there was a sufficient distance between the coil and the homogeneous magnetic field region. The main reason for the error magnetic field was dimensional errors in the outer diameters and positions on the z-axis.

    DOI: 10.1109/TASC.2016.2529841

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  • Optimal Configuration Design of MRI REBCO Magnet Taking into Account Superconducting Layer 査読

    So Noguchi, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    2016 IEEE CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION (CEFC)   2016年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    The development of ultra-high-field (similar to 10 T magnetic resonance imaging (MRI) device is underway. It is, therefore, required to achieve the extremely high field homogeneity at a magnet design stage, where the field homogeneity is evaluated using the Legendre polynomials. Commonly, it is supposed that the current uniformly flows on the cross section of coils. However, for REBCO magnet, the no-current-flowing region has to be taken into account, such as a copper stabilizer. In addition, the REBCO layer inside REBCO tape is very thin, 1 - 2 mu m, so the current-flowing region is 1/100 of the REBCO tape area. Therefore, it is necessary to consider that the current flows only in the REBCO layer, for accurate evaluation of field homogeneity.

    DOI: 10.1109/CEFC.2016.7815982

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  • R&D Progress of HTS Magnet Project for Ultrahigh-field MRI 査読

    Taizo Tosaka, Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    PROCEEDINGS OF THE 28TH INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS 2015)   81   145 - 148   2016年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    An R&D project on high-temperature superconducting (HTS) magnets using rare-earth Ba2Cu3O7 (REBCO) wires was started in 2013. The project objective is to investigate the feasibility of adapting REBCO magnets to ultrahigh field (UHF) magnetic resonance imaging (MRI) systems. REBCO wires are promising components for UHF-MRI magnets because of their superior superconducting and mechanical properties, which make them smaller and lighter than conventional ones. Moreover, REBCO magnets can be cooled by the conduction-cooling method, making liquid helium unnecessary. In the past two years, some test coils and model magnets have been fabricated and tested. This year is the final year of the project. The goals of the project are: (1) to generate a 9.4 T magnetic field with a small test coil, (2) to generate a homogeneous magnetic field in a 200 mm diameter spherical volume with a 1.5 T model magnet, and (3) to perform imaging with the 1.5 T model magnet. In this paper, the progress of this R&D is described. The knowledge gained through these R&D results will be reflected in the design of 9.4 T MRI magnets for brain and whole body imaging. (C) 2016 Published by Elsevier B.V.

    DOI: 10.1016/j.phpro.2016.04.034

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  • Electromagnetic Analysis on Magnetic Field and Current Distribution in High Temperature Superconducting Thin Tape in Coil Winding 査読 国際誌

    Hiroshi Ueda, SeokBeom Kim, So Noguchi, Atsushi Ishiyama, Hiroshi Miyazaki, Sadanori Iwai, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    2016 IEEE CONFERENCE ON ELECTROMAGNETIC FIELD COMPUTATION (CEFC)   2016年

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

    High temperature superconducting (HTS) wires are high aspect ratio cross-section tapes. Therefore, the applications of HTS tapes lead to various problems such as AC loss, nonuniform current, and screening current. In practice, we must investigate the detail of current distribution in HTS tapes using the electromagnetic analysis technique dealing with high aspect ratio tape and nonlinearity of superconductor. We developed the numerical simulation code of electromagnetic field analysis in HTS tape using a finite element method (FEM) and fast multipole method (FMM).

    DOI: 10.1109/CEFC.2016.7816041

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  • Development of Non-Circular REBCO Pancake Coil for High-Temperature Superconducting Cyclotron 査読

    Xudong Wang, Hirotaka Umeda, Atsushi Ishiyama, Masaki Tashiro, Hiroshi Yamakawa, Hiroshi Ueda, Tomonori Watanabe, Shigeo Nagaya

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   4601904   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    A series of feasibility studies are carried out on the applications of a high-temperature superconducting (HTS) magnet system to a heavy-ion accelerator for particle cancer therapy. A novel HTS cyclotron is expected to be more compact and have higher efficiency than a conventional heavy ion synchrotron accelerator. A high current density is required for the HTS magnet to realize a compact HTS cyclotron. Further, a high-strength reinforcing structure is absolutely essential for the HTS magnet owing to the large Lorentz force caused by the high current density to prevent the magnet deformation and maintain the required high accuracy field. In a previous study, a novel coil structure called the Y-based oxide superconductor and reinforcing outer integrated "YOROI coil" was proposed and tested at 4.2 K in 8-T backup fields. The YOROI model coil exhibited no degradation after the excitation test with a maximum hoop stress of 1.7 GPa determined by the product of the magnetic field, current density, and coil radius. The mechanism of stress sharing between the coil winding and the reinforcing structures of the YOROI coil was numerically determined. In addition, the electromagnetic and mechanical properties of a reinforcing structure based on the YOROI coil for circular REBCO coils assuming part of the HTS cyclotron magnet system was also numerically simulated in the previous paper. In this study, a new reinforcing structure is proposed on the basis of the YOROI coil for a non-circular REBCO coil assuming part of the HTS cyclotron magnet system. The electromagnetic andmechanical properties for the new reinforcing structure are numerically determined. As a result, the proposed reinforcing structure has great ability to reduce the stress and strain acting on the coil winding to maintain the coil shape and prevent degradation in the REBCO wire.

    DOI: 10.1109/TASC.2014.2365626

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  • Developments of hts magnets

    K. Hatanaka, M. Fukuda, K. Kamakura, H. Ueda, T. Yorita, T. Saito, Y. Yasuda

    Proceedings of the 6th International Particle Accelerator Conference   2905 - 2907   2015年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Reduction of Irregular Magnetic Field Generated by Screening Current in REBCO Coil 査読 国際誌

    Hiroshi Ueda, Jun Saito, Yuta Ariya, Ayumu Mochida, Tao Wang, Xudong Wang, Koh Agatsuma, Atsushi Ishiyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   6603205   2015年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In REBCO coils, the screening current flows in the tape in response to the normal component of the linkage flux to the tape's wide face. Generally, the radial component of the magnetic field is large at both ends of the coil winding. Therefore, changes in the winding arrangement may be expected to reduce screening current induction. Furthermore, multifilamentary or narrow REBCO tapes with widths of a few millimeters can be also expected to reduce the magnitude of the screening current. Based on the above considerations, in this paper, we numerically investigated the reduction effect on a magnetic field generated by a screening current in a REBCO coil, due to thinning tape width and varying coil winding arrangements. It was found that the screening field is inversely proportional to the number of tape filaments, whereas a smaller coil winding aspect ratio leads to a decrease in the screening field.

    DOI: 10.1109/TASC.2014.2375953

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  • Evaluation of Magnetic-Field Distribution by Screening Current in Multiple REBCO Coils 査読 国際誌

    Hiroshi Ueda, Atsushi Ishiyama, Yuta Ariya, Tao Wang, Xudong Wang, Koh Agatsuma, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   4700705   2015年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In a superconducting coil using a REBCO tape, a large screening current is induced by the magnetic field perpendicular to the tape. The irregular magnetic field generated by this screening current affects the magnetic-field distribution in high-field magnet applications, which require a magnetic field with high accuracy and temporal stability. Therefore, in these applications of the REBCO coil, we have to investigate and suppress the influence of the screening current in the REBCO tapes. In this study, we carried out experiments and numerical simulations focusing on the irregular magnetic field generated by the screening currents in multiple-REBCO-coil models assuming real operations in magnetic applications such as NMR/MRI system. The results of the numerical simulation are in good agreement with the behaviors of the screening field observed in the experimental results. In addition, we discussed the differences in the screening field for various excitation conditions using the numerical results of the current distribution in the coil.

    DOI: 10.1109/TASC.2014.2371133

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  • Project Overview of HTS Magnet for Ultra-high-field MRI System 査読

    Taizo Tosaka, Hiroshi Miyazaki, Sadanori Iwai, Yasumi Otani, Masahiko Takahashi, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shinichi Urayama, Hidenao Fukuyama

    Proceedings of the 27th International Symposium on Superconductivity (ISS 2014)   65   217 - 220   2015年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:ELSEVIER SCIENCE BV  

    A project to develop an ultra-high-field magnetic resonance imaging (MRI) system based on HTS magnets using (RE)Ba2Cu3O7 (REBCO; RE=rear earth) coils is underway. The project is supported by the Japanese Ministry of Economy, Trade and Industry and aims to establish magnet technologies for a whole-body 9.4 T MRI system. REBCO wires have high critical current density in high magnetic fields and high strength against hoop stresses, and therefore, MRI magnets using REBCO coils are expected to have cryogenic systems that are smaller, lighter, and simpler than the conventional ones. A major problem in using REBCO coils for MRI magnets is the huge irregular magnetic field generated by the screening current in REBCO tapes. Thus, the main purpose of this project is to make the influence of this screening current predictable and controllable. Fundamental technologies, including treatment of the screening currents, were studied via experiments and numerical simulations using small coils. Two types of model magnets are planned to be manufactured, and the knowledge gained in the development of the model magnets will be reflected in the magnet design of a whole-body 9.4 T MRI system. (C) 2015 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

    DOI: 10.1016/j.phpro.2015.05.122

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  • Influence of Winding Accuracy on Magnetic Field Distribution in YBCO Pancake Coil for Cyclotron Application 査読

    Tao Wang, Hiraku Karino, Kenta Michitsuji, Xudong Wang, Atsushi Ishiyama, Hiroshi Ueda, Mitsuhiro Fukuda, Tomonori Watanabe, Shigeo Nagaya

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   24 ( 3 )   9002005   2014年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In recent years, YBCO high-temperature superconducting (HTS) tapes have been expected to be applied to devices in power systems or in other industrial applications, owing to their rapidly improving quality and productivity. Our objective is to develop an HTS cyclotron with a compact body, high efficiency of output power, and high performance in heavy particle radiotherapy. In such an application, extremely high precision is required in the range 0.01% to 0.1% of magnetic field, both spatially and temporally. An isochronous field along with an azimuthally varying field is generated by an air-core pancake coil system during construction. Therefore, developing a technology for extremely high coil-winding accuracy is very important. In this study, we constructed an experimental model of a YBCO pancake coil using a high-precision coil winding machine. Then, the winding error in the radial and axial directions was experimentally evaluated using a pair of laser displacement meters and a surface roughness tester. We also developed a numerical simulation model to analyze the influence of winding error on the magnetic field distribution. The relationship between the winding error and the magnetic field of the meter-class YBCO coil assuming a real system was also evaluated by numerical simulation.

    DOI: 10.1109/TASC.2013.2297317

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  • Measurement and Simulation of Magnetic Field Generated by Screening Currents in HTS Coil 査読 国際誌

    Hiroshi Ueda, Mitsuhiro Fukuda, Kichiji Hatanaka, Kenta Michitsuji, Hiraku Karino, Tao Wang, Xudong Wang, Atsushi Ishiyama, So Noguchi, Yoshinori Yanagisawa, Hideaki Maeda

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   24 ( 3 )   4701505   2014年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In coils wound with high-temperature superconducting (HTS) tapes, large screening currents are induced in the tape by the radial component of the magnetic field. Furthermore, when a transport current is supplied to the HTS tape under a magnetic field, the total current (which consists of the transport and screening currents) flows inhomogeneously. The magnetic field generated by the screening currents affects the magnetic field distribution in cyclotron applications. Investigating the effects of the screening currents on the reduction, hysteresis, and drift of the magnetic field in the HTS coil is therefore necessary. In our previous studies, we have developed a novel simulation code for a three-dimensional electromagnetic field with the aim of clarifying these effects. In the present study, we measured the reduction and hysteresis of the magnetic field generated by the screening currents for a small model of HTS pancake coil. Additionally, we numerically investigated the influence of the screening current in the Furs coil on the spatial and temporal behavior of the magnetic field using our developed simulation code, which considers the nonlinear voltage-current characteristics.

    DOI: 10.1109/TASC.2014.2299537

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  • Development of Degaussing System of Magnetic Filters for High Gradient Magnetic Separation to Improve Recovery Ratio of Trapped Magnetic Nanobeads 査読

    Kazuhiro Kajikawa, Hiroshi Ueda, Yasuharu Kamioka, Koh Agatsuma, Shuichiro Fuchino, Mitsuho Furuse, Tomohiro Iitsuka, Shuichi Nakamura

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   24 ( 3 )   4400305   2014年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have successfully developed a high-gradient magnetic separation system for medical proteins using affinity magnetic nanobeads. Our system shows very high separation efficiency and can also be expected to realize lower cost due to larger production rate compared to the conventional system. The developed system consists of a 3-T superconducting magnet and a filter made of fine magnetic metal fibers. The superconducting magnet is wound with a NbTi twisted multifilamentary wire, and cooled by a 4-K Gifford-McMahon cryocooler. In order to achieve high recovery ratio of the magnetic nanobeads trapped on the filter located in a room-temperature clear bore of the cryostat, the ac degaussing system for the filter is fabricated using an inductance capacitance resonance circuit composed of a series connection with the superconducting magnet and an additional capacitor. To perform the inductance capacitance resonance more than a few cycles between superconducting magnet and capacitor, the superconducting magnet has a slit in the bobbin to prevent an eddy current coupled with an alternating magnetic field. It also has a control system for a high-speed switching circuit. This magnet can successfully generate a magnetic field of 3.0 T in the clear bore of the cryostat with a diameter of 30 mm in a relatively fast sweep time of 150 s due to the slit in the magnet bobbin. Using our degaussing system, a high recovery ratio of the nanobeads in pure water has been performed about 94.1%.

    DOI: 10.1109/TASC.2013.2281364

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  • Development of Superconducting High Gradient Magnetic Separation System for Medical Protein Separation 査読

    Shuichiro Fuchino, Mitsuho Furuse, Koh Agatsuma, Yasuharu Kamioka, Tomohiro Iitsuka, Shuichi Nakamura, Hiroshi Ueda, Kazuhiro Kajikawa

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   24 ( 3 )   4400204   2014年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Medical proteins such as monoclonal antibodies and immunoglobulins are important substances for the manufacture of medicines for cancer, etc. However, the conventional separation system for these medical proteins has very low separation rate and the cost is extremely high. To address these issues, we have developed a high gradient magnetic separation system for medical proteins using affinity magnetic nanobeads. Our system shows very high separation efficiency and can achieve low cost owing to its large production rate compared with conventional systems. The system consists of a 3T superconducting magnet cooled by a cryocooler, a filter made of fine magnetic metal fibers of about 30 mu m in diameter with demagnetization circuit and liquid circulation pump for the solvent containing the medical proteins. Reducing the size of the system entails reduction of the cryocooler size, thereby resulting in reduced cooling capacity. Therefore, the heat load on the cryocooler has been considered carefully in the design of the cryogenic system. The calculated heat load of the 1st and 2nd stages was made to satisfy the cooling capacity of the cryocooler. As a result, a magnet temperature of 4.2 K and a thermal shield temperature of 60 K have been achieved, enabling smooth operation and good performance of the HGMS separation system.

    DOI: 10.1109/TASC.2013.2281020

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  • Present Status of the RCNP Cyclotron Facility

    K. Hatanaka, M. Fukuda, K. Kamakura, S. Morinobu, T. Saito, H. Tamura, H. Ueda, Y. Yasuda, T. Yorita

    Proceedings of the 20th International Conference on Cyclotrons and their Applications   40 - 42   2014年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Developments of Ion Source Complex for Highly Intense Beam at RCNP

    T. Yorita, M. Fukuda, K. Hatanaka, K. Kamakura, S. Morinobu, A. Tamii, H. Ueda, Y. Yasuda

    Proceedings of the 20th International Conference on Cyclotrons and their Applications   189 - 191   2014年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Development of a New Active-Type Gradient Corrector for an AVF Cyclotron

    M. Fukuda, N. Hamatani, K. Hatanaka, K. Kamakura, S. Morinobu, K. Nagayama, T. Saito, H. Tamura, H. Ueda, Y. Yasuda, T. Yorita

    Proceedings of the 20th International Conference on Cyclotrons and their Applications   230 - 232   2014年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Developments of HTS Magnets at RCNP

    K. Hatanaka, M. Fukuda, K. Kamakura, S. Takemura, H. Ueda, Y. Yasuda, K. Yokoyama, T. Yorita, T. Kawaguchi

    Proceedings of the 20th International Conference on Cyclotrons and their Applications   242 - 244   2014年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Development of Rapid Emittance Measurement System

    K. Kamakura, M. Fukuda, N. Hamatani, K. Hatanaka, M. Kibayashi, S. Morinobu, K. Nagayama, T. Saito, H. Tamura, H. Ueda, H. Yamamoto, Y. Yasuda, T. Yorita

    Proceedings of the 20th International Conference on Cyclotrons and their Applications   171 - 173   2014年3月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Studies of extraction and transport system for highly charged ion beam of 18 GHz superconducting electron cyclotron resonance ion source at Research Center for Nuclear Physics 査読

    T. Yorita, K. Hatanaka, M. Fukuda, H. Ueda, Y. Yasuda, S. Morinobu, A. Tamii, K. Kamakura

    REVIEW OF SCIENTIFIC INSTRUMENTS   85 ( 2 )   02A741   2014年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    An 18 GHz superconducting electron cyclotron resonance ion source is installed to increase beam currents and to extend the variety of ions especially for highly charged heavy ions which can be accelerated by cyclotrons of Research Center for Nuclear Physics (RCNP), Osaka University. The beam production developments of several ions from B to Xe have been already done [T. Yorita, K. Hatanaka, M. Fukuda, M. Kibayashi, S. Morinobu, H. Okamura, and A. Tamii, Rev. Sci. Instrum. 79, 02A311 (2008) and T. Yorita, K. Hatanaka, M. Fukuda, M. Kibayashi, S. Morinobu, H. Okamura, and A. Tamii, Rev. Sci. Instrum. 81, 02A332 (2010)] and the further studies for those beam extraction and its transport have been done in order to increase the beam current more. The plasma electrode, extraction electrode, and einzel lens are modified. Especially extraction electrode can be applied minus voltage for the beam extraction and it works well to improve the extracted beam current. The extraction voltage dependences of transmission and emittance also have been studied for beam current improvement which is injected into azimuthally varying field cyclotron at RCNP. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4849675

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  • 医薬用タンパク質の超電導高勾配磁気分離装置の開発 査読

    植田 浩史, 柁川 一弘, 上岡 泰晴, 我妻 洸, 淵野 修一郎, 古瀬 充穂, 飯塚 倫尋, 中村 秀一

    低温工学   49 ( 1 )   25 - 34   2014年1月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2221/jcsj.49.25

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  • Medical Protein Separation System Using High Gradient Magnetic Separation by Superconducting Magnet

    Y. Kamioka, K. Agatsuma, K. Kajikawa, H. Ueda, M. Furuse, S. Fuchino, T. Iitsuka, S. Nakamura

    ADVANCES IN CRYOGENIC ENGINEERING   1573   1129 - 1134   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    A high gradient magnetic separation system for medical protein using affinity magnetic nano-beads has been developed. Medical protein such as monoclonal antibody or immunoglobulin is an important substance as a medicine for cancer etc. However; the separation system of these medical protein has very low separation rate and the cost of product is extremely high. The developed system shows very high separation efficiency and can achieve low cost by large production rate compared to the system now using in this field. The system consists of a 3T superconducting magnet cooled by a cryo-cooler, a filter made of fine magnetic metal wires of about 30 mu m diameter and a demagnetization circuit and a liquid circulation pump for solvent containing medical protein. Affinity magnetic nano-beads is covered with the medical protein after agitation of solvent containing the protein and nano-beads, then the solvent flows through the system and the beads are trapped in the filters by high gradient magnetic field. The beads are released and flow out of the system by the AC demagnetization of the filters using LC resonance circuits after discharge of the magnet. The test results shows 97.8% of the magnetic nano-beads in pure water were captured and 94.1% of total beads were collected.

    DOI: 10.1063/1.4860832

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  • Development of a Rapid Beam Emittance Measurement System using a Real-Time Beam Profile Monitor

    Keita Kamakura, Kichiji Hatanaka, Mitsuhiro Fukuda, Tetsuhiko Yorita, Hiroshi Ueda, Takane Saito, Shunpei Morinobu, Keiichi Nagayama, Hitoshi Tamura, Yuusuke Yasuda

    2014 19TH IEEE-NPSS REAL TIME CONFERENCE (RT)   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE  

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  • Spatial and Temporal Behavior of Magnetic Field Distribution Due to Shielding Current in HTS Coil for Cyclotron Application 査読 国際誌

    Hiroshi Ueda, Mitsuhiro Fukuda, Kichiji Hatanaka, Tao Wang, Atsushi Ishiyama, So Noguchi

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   23 ( 3 )   4100805   2013年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We intend to develop and obtain a compact, high-efficiency and high-performance cyclotron using the high-temperature superconducting (HTS) magnet technology. In cyclotron applications, a high-accuracy magnetic field distribution with an isochronous field and an azimuthally varying field is spatially and temporally required for an HTS coil. In coils wound with HTS tapes, large shielding currents are induced in the HTS tape by the radial component of the magnetic field. The magnetic field generated by the shielding current affects the magnetic field distribution in the cyclotron application in the following issues: (1) field reduction by the shielding current, (2) accuracy of the field distribution, (3) temporal stability of the time-dependent shielding currents, and (4) field repeatability after charge and discharge repetitions. These effects are very critical in cyclotron applications. We developed a novel numerical simulation based on the finite element method, boundary integral equation, and fast multipole method. We investigated the spatial and temporal behavior of the magnetic field attributed to the shielding current in the HTS coil for the HTS cyclotron application.

    DOI: 10.1109/TASC.2012.2234813

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  • HTS magnet to polarize ultra cold neutrons

    K. Hatanaka, M. Fukuda, N. Hamatani, K. Kamakura, T. Saito, H. Ueda, T. Yorita, Y. Yasuda, T. Kawaguchi

    Proceedings of the 4th International Particle Accelerator Conference   3522 - 3524   2013年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

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  • Conceptual Design of Next Generation HTS Cyclotron 査読 国際誌

    Hiroshi Ueda, Mitsuhiro Fukuda, Kichiji Hatanaka, Tao Wang, Xudong Wang, Atsushi Ishiyama, So Noguchi, Shigeo Nagaya, Naoji Kashima, Nobuyuki Miyahara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   23 ( 3 )   4100205   2013年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In recent years, the quality of high-temperature superconducting (HTS) tapes has been improving rapidly, becoming available in sufficient quantity and length, and can be applied to devices for power systems and industrial applications. Therefore, we are carrying out a feasibility study on the application of HTS coil to a medical accelerator system for particle cancer therapy, and designing a new HTS cyclotron that is to be compact, highly efficient, is able to extract high-energy beam and consume less power. In this paper, we report our effort to develop a conceptual magnetic design of a "next generation HTS cyclotron" using high-temperature superconducting technology.

    DOI: 10.1109/TASC.2012.2232955

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  • Numerical simulation of screening current distribution in HTS tape of high field magnet 査読

    Ryusei Itoh, Yuki Oga, So Noguchi, Hajime Igarashi, Hiroshi Ueda

    Physica C: Superconductivity and its Applications   484   300 - 304   2013年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In recent years, properties of high temperature superconducting (HTS) tapes, especially in-field performance and mechanical strength, have been continuously improved. The HTS tapes have been widely used for high field (&gt
    20 T) magnet researches and there are several technical challenges including field attenuation of an HTS magnet by screening currents induced within the HTS tapes. Several publications reported that the screening currents, induced by penetration of self magnetic fields into HTS tapes within an HTS magnet, weakened a field constant of the HTS magnet. The result may demonstrate that the screening current changes an overall current density distribution in HTS tapes and, as a consequence, the generated magnetic field. Therefore, it is necessary to investigate the screening current distribution in an HTS tape. This paper reports numerical simulation of the screening current distribution in an HTS tape of high field magnets using 2D finite element method with the E-J characteristic of the HTS tape taken into account. Self magnetic field distribution and its orientation to the HTS tape are also considered to compute critical currents and locally generated electric fields, two key components to figure out the distribution of screening currents.

    DOI: 10.1016/j.physc.2012.03.040

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  • 応用電磁気学:超電導機器応用のための電磁界数値解析I -電磁界数値解析の基礎- 招待 査読

    植田 浩史, 石山 敦士

    低温工学   47 ( 11 )   623 - 632   2012年11月

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    記述言語:日本語  

    DOI: 10.2221/jcsj.47.623

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  • Quench Detection and Protection of Cryocooler-Cooled YBCO Pancake Coil for SMES 査読 国際誌

    Hiroshi Ueda, Atsushi Ishiyama, Kazuki Muromachi, Takahiro Suzuki, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   22 ( 3 )   4702804   2012年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In this paper, we focus on the quench detection and protection of a cryocooler-cooled pancake coil for SMES wound with a YBCO bundle conductor composed of laminated electrically insulated YBCO-coated conductors. Because the normal-zone propagation velocity is much slower in a high-temperature superconducting (HTS) coil than in a low-temperature superconducting (LTS) coil, the detection of the non-recovering normal zone using a voltage signal is quite difficult. Quench detection is considered to be more difficult during SMES operation because of the noise of the converter or other equipment. Therefore, a quench must be detected using some other method. In the previous paper, we showed that a quench in the coil could be detected by observing the transposition of the current in the bundle conductor caused by local normal transition. In this paper, based on this quench detection method, we investigate the transposition of current and the thermal behavior during the quench detection and the dumping of the stored energy by an external resistance in coils wound with a YBCO laminated bundle conductor for SMES and determine the appropriate stabilizer thickness of the YBCO-coated conductors.

    DOI: 10.1109/TASC.2011.2174578

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  • Transport and emittance study for 18 GHz superconducting-ECR ion source at RCNP 査読

    T. Yorita, K. Hatanaka, M. Fukuda, H. Ueda, M. Kibayashi, S. Morinobu, A. Tamii

    REVIEW OF SCIENTIFIC INSTRUMENTS   83 ( 2 )   2012年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    As the upgrade program of the azimuthally varying field (AVF) cyclotron is at the cyclotron facility of the RCNP, Osaka University for the improvement of the quality, stability, and intensity of accelerated beams, an 18 GHz superconducting (SC) ECR ion source has been installed to increase beam currents and to extend the variety of ions, especially for highly charged heavy ions which can be accelerated by RCNP AVF cyclotron. The production development of several ions such as B, O, N, Ne, Ar, Ni, Kr, and Xe has been performed by Yorita et al. [Rev. Sci. instrum. 79, 02A311(2008); 81, 02A332 (2010)]. Further studies for the beam transport have been done in order to improve the beam current more for injection of cyclotron. The effect of field leakage of AVF main coil is not negligible and additional steering magnet has been installed and then beam transmission has been improved. The emittance monitor has also been developed for the purpose of investigating correlation between emittance of beam from ECR ion sources and injection efficiency. The monitor consists with :BPM82 with rotating wire for fast measurement for efficient study. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3671748]

    DOI: 10.1063/1.3671748

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  • Transport and emittance study for 18 GHz superconducting-ECR ion source at RCNP 査読

    T. Yorita, K. Hatanaka, M. Fukuda, H. Ueda, M. Kibayashi, S. Morinobu, A. Tamii

    Review of Scientific Instruments   2012年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Evaluation of Positional Stability in Active Magnetic Levitation Using Spherical HTS Bulk for Inertial Nuclear Fusion 査読

    Tao Wang, Hiroshi Ueda, Koh Agatsuma, Atsushi Ishiyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   21 ( 3 )   1579 - 1583   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Fuel supply is a fundamental issue in application of inertial nuclear fusion. To address this issue, we propose the use of an HTS superconductor capsule containing nuclear fuel, which can levitate in a magnetic field. During magnetic levitation, positional stability is important because it affects levitation accuracy to the focal point of giant lasers. We have developed a numerical simulation program based on a 3-D hybrid finite element and boundary element method to evaluate positional stability during magnetic levitation. Moreover, we have optimally designed and constructed a multi-coil system wherein spherical HTS bulk of 5 mm diameter can levitate stably. Finally, we have conducted the experiments for the evaluation of magnetic levitation, and compared the results with our simulation.

    DOI: 10.1109/TASC.2010.2098383

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  • Current Margin Against the Fault Current in REBCO Coated Conductors 査読

    Atsusi Ishiyama, Hiroshi Momotari, Xudong Wang, Michio Arai, Hiroshi Ueda, Masayoshi Ohya, Kazuya Ohmatsu, Noboru Fujiwara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   21 ( 3 )   3033 - 3036   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    The application of yttrium barium copper oxide (YBCO) coated conductors in power cables is anticipated. In practical applications, high-temperature superconducting (HTS) cables can be subjected to short-circuit fault current and are expected to operate for over 30 years. In order to safeguard the current margin of YBCO coated conductors against fault current, we carried out preliminary experiments on overcurrent characteristics using an HTS model cable. Meanwhile, we performed numerical simulations to clarify the electromagnetic and thermal behaviors of the HTS model cable. In this study, we numerically simulated the fault current waveform in each YBCO coated conductor that constitutes an entire cable. We then carried out experiments focusing on the current-voltage (I - V) characteristics and the current margin without causing critical current (I(c)) degradation against the fault current by varying the amplitude of the waveform obtained numerically. Furthermore, we repeatedly applied the fault current to a YBCO coated conductor to experimentally investigate the I(c) degradation caused by iterative fault current.

    DOI: 10.1109/TASC.2010.2086413

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  • Degradation of YBCO Coated Conductors Due to an Over-Current Pulse 査読

    Atsushi Ishiyama, Michio Arai, Hiroshi Momotari, Xudong Wang, Hiroshi Ueda, Takashi Saito, Yuji Aoki, Masashi Yagi, Takato Machi, Noboru Fujiwara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   21 ( 3 )   3025 - 3028   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    YBCO coated conductors are candidate materials for future electric power devices such as transmission cables, transformers, and fault current limiters. In practical applications, YBCO coated conductors are subject to short-circuit fault currents greater than the operating current. These fault currents cause heat generation, resulting in degradation of the characteristics of YBCO coated conductors. It is therefore necessary to identify the maximum temperatures under which YBCO coated conductors can operate without suffering degradation. To date, we have carried out preliminary experiments on the degradation of YBCO coated conductors due to an over-current pulse. We also focused on the relationship between increases in temperature and Ic degradation. In this study, we prepared YBCO coated conductors fabricated by TFA-MOD method. We also carried out over-current tests to investigate the Ic degradation and performed numerical simulations on thermal stress to estimate the stress and strain acting on the YBCO layer.

    DOI: 10.1109/TASC.2010.2092396

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  • Quench Behavior and Protection in Cryocooler-Cooled YBCO Pancake Coil for SMES 査読

    Atsushi Ishiyama, Hiroshi Ueda, Yoshiaki Aoki, Koji Shikimachi, Naoki Hirano, Shigeo Nagaya

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   21 ( 3 )   2398 - 2401   2011年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    The thermal behavior of a high-temperature superconducting (HTS) coil is significantly different from that of low-temperature superconducting (LTS) coil because it has a greater volumetric heat capacity at the temperature required for practical use. Therefore, the possibility of quench in HTS coils is much lower than that in LTS coils. In the application of the YBCO coil to Superconducting Magnetic Energy Storage (SMES) system, electrical charging and discharging are repeated; therefore, the superconducting characteristics of the YBCO coated conductor may deteriorate as a result of cyclic subjection to tensile strain. To enhance the reliability and safety of HTS coil, protection scheme assuming a quench is also required for HTS coil. In this study, we focus on the coil wound with YBCO laminated bundle (parallel) conductor supposing SMES application and investigate the characteristics of normal-zone propagation and the thermal behavior within the coil during a quench by using a newly developed computer code based on the finite element method and an equivalent circuit. And we also propose a quench detection method using observation of nonuniform current in YBCO laminated bundle conductor and discuss the validity of the detection method comparing with conventional quench-voltage detection.

    DOI: 10.1109/TASC.2010.2093491

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  • Degradation characteristics of YBCO coated conductors due to fault-current in power cable applications 査読

    H. Kono, X. Wang, H. Ueda, A. Ishiyama, T. Saitoh, Y. Aoki, M. Yagi, S. Mukoyama, N. Fujiwara

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   470 ( 20 )   1334 - 1337   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    In high temperature superconductor applications used in electric power devices, YBCO coated conductors may be subjected to short-circuit fault-currents that are 10-30 times the normal operating current. These over-currents cause heat generation, resulting in 1, degradation of the YBCO coated conductor. Therefore, it is necessary to fully investigate the degradation characteristics of YBCO coated conductors. We previously conducted preliminary experiments on the degradation of YBCO sample tapes resulting from the over-current pulse drive.
    In this study, we analyzed the waveform of fault-current that is supposed to flow into the YBCO coated conductor when a short-circuit fault occurs in a power cable application, by using a newly developed numerical simulation program. We also carried out experiments in which an over-current with the analyzed fault-current waveform was applied to two YBCO sample tapes. We then investigated the degradation characteristics, focusing on the amount of current permitted. Experimental results showed that both the sample tapes (initial I(c) = 118.6 A and 123.2 A) were degraded by applying an over-current with a peak value of 320 A. (C) 2010 Published by Elsevier B.V.

    DOI: 10.1016/j.physc.2010.05.106

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  • Design and evaluation of 66 kV class RE-123 superconducting cable 査読

    T. Minamino, M. Ohya, H. Yumura, T. Masuda, T. Nagaishi, Y. Shingai, X. Wang, H. Ueda, A. Ishiyama, N. Fujiwara

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   470 ( 20 )   1576 - 1579   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    In the new national project, as wire and cable development, Sumitomo Electric Industries, Ltd. (SEI) is trying to develop a 66 kV/5 kArms high temperature superconducting (HIS) cable with its own REBa(2)Ca(3)O(x) (RE-123, RE = rare earth element) coated conductors. In an actual power grid, an inflow of current higher than the normal rated power (fault-current) can occur. The maximum fault-current condition is set at 31.5 kArms for 2s for 66 kV-class transmission system in this project. Therefore, one of the technical targets in this project is to design the wires and cables to survive at this fault-current condition. As the first step, the prototype HIS cable was designed against the fault-current condition of 31.5 kArms for 2 s. The wires have copper plating as a stabilizer layer not to be damaged by over-currents. The designed HIS cable has a copper former and copper shield layers in parallel with the HIS conducting layers and HTS shield layers, respectively, to control the temperature rises in the cable core at fault-current conditions. As the second step, a sample HIS cable core was fabricated and fault-current tests were conducted to check its soundness. The temperature rises in the cable core were measured under various fault-current conditions. The critical current of the cable core was measured before and after the fault-current tests, and no deterioration in the critical current characteristics was observed. However, there was slight degradation of the n value. The investigation will be conducted, and the results will be fed back to designs of the RE-123 wires and cables. (C) 2010 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.physc.2010.05.165

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  • Computer simulation of fault current characteristics in 275 kV class YBCO power cable 査読

    S. Sato, X. Wang, H. Ueda, A. Ishiyama, M. Yagi, S. Mukoyama, T. Saitoh, Y. Aoki, N. Fujiwara

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   470 ( 20 )   1572 - 1575   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    In japan, the development of a 275 kV class YBCO power cable was started in 2008 with the support of the New Energy and Industrial Technology Development Organization (NEDO). In the designing of 275 kV YBCO power cable, the thickness of insulator is required to be 26 mm. Thus, in order to design the 275 kV YBCO power cable, it is important to estimate the thermal diffusion through the electrical insulation layer for designing the high-voltage YBCO power cable. Furthermore, YBCO power cables might be subjected to short-circuit fault currents that are 10-30 times a normal operating current. Therefore, in order to ensure stability and feasibility of superconducting power cables, we need to investigate the thermal characteristics and current distribution in the cable in the normal and fault conditions. The objective of this study is to investigate the thermal characteristics and dielectric performance in 275 kV class power cables. We carried out experiments on dummy cables in a steady state to clarify the distribution of temperature. In order to estimate the thermal conductivity and the heat capacity of the insulation layer, we performed numerical simulations using a developed computer program on the basis of the 3D finite element method. We also measured a tans and permittivity of an insulation layer in order to investigate the dielectrical performance. (C) 2010 Published by Elsevier B.V.

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  • Numerical simulation on fault current condition in 66 kV class RE-123 superconducting cable 査読

    X. Wang, H. Ueda, A. Ishiyama, M. Ohya, H. Yumura, N. Fujiwara

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   470 ( 20 )   1580 - 1583   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The new Japanese national project of development of 66 kV/5 kA high-temperature superconducting (HIS) power cables has been started since 2008. In an AC power system, a fault current may flow in the event of a short circuit accident. The maximum fault current condition is defined to be 31.5 kA(rms) for duration of 2 s for 66 kV class transmission line in this project. Therefore, one of the technical targets in this project is to design the HIS power cable to survive at this fault current condition. The coated conductors have copper layer as a stabilizer not to be damaged by over-currents. The HIS cable has a copper former and copper shield layers in parallel with the HIS conductor layers and HIS shield layers, respectively, to control the temperature rises in the HIS cable at a fault accident. In this study, we simulated the maximum temperature rises in the HIS power cable at the fault current condition of 31.5 kA(rms) for 25 in order to design the copper stabilizer and copper shield layers by using a computer program we developed on the basis of 3D finite element method (FEM) and electrical circuit model. (C) 2010 Published by Elsevier B.V.

    DOI: 10.1016/j.physc.2010.05.166

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  • Determination of stabilizer thickness for YBCO coated conductors based on coil protection 査読

    Y. Kawai, A. Ishiyama, H. Ueda, S. Nagaya, K. Shikimachi, N. Hirano

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   470 ( 20 )   1865 - 1869   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The possibility of the occurrence of quench caused by mechanical disturbance in high-temperature superconductors (HTS's) is much lower than that in low-temperature superconductors. However, to enhance the reliability and safety of HTS coils, it is necessary to establish a stability criterion and a protection scheme on the basis of the assumption that the quench is caused by the failure in power supply, cooling systems, etc. In this study, we assume that the stored magnetic energy in the HTS coil is dissipated by an external resistance that acts as a quench protection. Under this assumption, we derive a function that examines the heat balance of quenching YBCO coil under an adiabatic condition and propose a criterion using the derived function to determine an appropriate stabilizer thickness of YBCO conductors. (C) 2010 Published by Elsevier B.V.

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  • Improvement of a High-Gradient Magnetic Separation System for Trapping Immunoglobulin in Serum 査読 国際誌

    Hiroshi Ueda, Koh Agatsuma, Shuichiro Fuchino, Tomohiro Imura, Mitsuho Furuse, Kazuhiro Kajikawa, Atsushi Ishiyama, Tatsuo Koizumi, Shinichiro Miyake

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   20 ( 3 )   949 - 952   2010年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Recently, affinity magnetic beads have been widely used in immunomagnetic cell sorting (IMCS) technology. Today, we can easily sort and analyse DNA and antibodies (immunoglobulin) using various types of affinity magnetic beads available in the market. The diameters of the affinity magnetic beads used in immunomagnetic cell sorting are above approximately 1 mu m because of the low magnetic fields induced by permanent magnets. At present, nanosized affinity magnetic beads are strongly desired to achieve high resolutions. We have been studying and attempting to develop a high-gradient magnetic separation (HGMS) system that employs a superconducting magnet to induce a considerably higher magnetic field than that induced by a permanent magnet. The objective is to trap smaller nanosized affinity magnetic beads using a filter made of fine stainless steel wool. In a previous study, we constructed a prototype of a desktop-type HGMS system using a cryocooler-cooled LTS magnet; we conducted preliminary experiments on trapping nanosized magnetic particles and investigated the magnetic field distribution and magnetic force around a magnetic wire in the filter by means of a numerical simulation.
    In this study, we succeeded in producing prototype nanobeads covered with the biosurfactant of a high-affinity ligand system for immunoglobulin G and M. Furthermore, we attempted to improve the recovery of nanobeads by adding a resonance circuit to the HGMS system. In practice, the trapped nanobeads attract one another and agglomerate due to their remaining magnetization when the magnetic field is decreased to 0 T. Therefore, the nanobeads and wire are demagnetized in the AC magnetic field by the resonance circuit, making good use of the superconducting magnet of the HGMS system.

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  • Thermal Characteristics of 275 kV/3 kA Class YBCO Power Cable 査読

    Xudong Wang, Hiroshi Ueda, Atsushi Ishiyama, Masashi Yagi, Takashi Saitoh, Yuji Aoki, Noboru Fujiwara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   20 ( 3 )   1264 - 1267   2010年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    In Japan, the development of a 275 kV/3 kA class YBa(2)Cu(3)O(7) (YBCO) power cable was started in 2008. A high-temperature superconducting (HTS) power cable typically consists of a copper former, HTS conductor layers, an electrical insulation layer, HTS shield layers, and copper shield layers. 275 kV/3 kA class YBCO power cables may be subjected to a fault current of 63 kA(rms) for 0.6 s. Therefore, in order to ensure stability and feasibility of superconducting power cables, we need to investigate the thermal characteristics and current distribution in the cable under fault conditions. In this study, we performed numerical simulations on a YBCO model cable under fault conditions by using a computer program we developed on the basis of 3D finite element method (FEM) and electrical circuit model.

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  • Numerical Simulation of Critical Current Performance in Nb3Sn Strand Subjected to Periodic Bending Deformation 査読

    Haruyuki Murakami, Hiroshi Ueda, Atsushi Ishiyama, Norikiyo Koizumi, Kiyoshi Okuno

    ELECTRICAL ENGINEERING IN JAPAN   171 ( 3 )   7 - 15   2010年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    In the ITER Engineering Design Activity (EDA), four NB3Sn model coils were developed and successfully tested. However, it was revealed that the critical current of the conductor degraded with the increase of electromagnetic force. One of the explanations of this phenomenon is a strand bending caused by enormous electromagnetic force. The authors therefore developed a simulation code using the distributed circuit model to investigate dependency of the critical current performance on the periodic bending deformation. The simulation results were in good agreement with the experiments. The dependence of the critical current on the periodic transverse load, temperature, periodic load pitch, thickness of Ta barrier which prevents Cu stabilizer from being contaminated by Sn, twist pitch of the strand, and RRR of the bronze matrix was investigated using the developed code. The results showed that the critical current degraded less with decreasing the pitch of the transverse load and increasing the Ta barrier thickness. It suggests that the shorter cabling pitch and the larger bending stiffness prevent the critical current degradation. (C) 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 171(3): 7-15, 2010; Published online in Wiley Inter Science (www.interscience.wiley.com). DOI 10.1002/eej.20923

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  • Over-current characteristics of YBCO superconducting cable 査読

    X. Wang, H. Ueda, A. Ishiyama, M. Yagi, S. Mukoyama, N. Kashima, S. Nagaya, Y. Shiohara

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   469 ( 15-20 )   1717 - 1721   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    To achieve large current capacity and high mechanical flexibility, YBa(2)Cu(3)O(7) (YBCO) superconducting cables consist of a number of YBCO coated conductors that are assembled and wound spirally on a Cu former. In practical applications, superconducting cables are vulnerable to short-circuit fault currents that are 10-30 times greater than the operating current. Therefore, in order to ensure the stability of YBCO superconducting cables in such a situation and to protect them from the fault currents, it is important to investigate the redistribution of the transport current and electromagnetic coupling between the conductor layer, shield layer, and Cu former. In this study, we carried out experiments on a 10-m-long YBCO model cable, which was manufactured by Furukawa Electric. An over-current with a peak of 31.8 kA(rms) and a duration of 2.02 s was applied to the model cable. We performed numerical simulations using a novel computer program developed using the 3D finite element method to elucidate the electromagnetic and thermal behavior of the YBCO model cable in the presence of an over-current. (C) 2009 Published by Elsevier B.V

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  • Design and Test of Filter of High Gradient Magnetic Separation System for Trapping Immunoglobulin in Serum 査読 国際誌

    Hiroshi Ueda, Koh Agatsuma, Kazuhiro Kajikawa, Mitsuho Furuse, Shuichiro Fuchino, Atsushi Ishiyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   19 ( 3 )   2157 - 2161   2009年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Recently, affinity magnetic beads have been widely used in immunomagnetic cell sorting (IMCS) technology. Today, we can easily sort and analyze DNA and antibodies (immunoglobulin) using various types of affinity magnetic beads available in the market. The diameters of these affinity magnetic beads used in immunomagnetic cell sorting are limited to above approximately 1 because of the low magnetic fields induced by permanent magnets. Now, nano-sized affinity magnetic beads are strongly desired to achieve high resolutions. We have been studying and attempting to develop a high-gradient magnetic separation (HGMS) system that employs a superconducting magnet to induce a considerably higher magnetic field than that induced by a permanent magnet in order to trap smaller nano-sized affinity magnetic beads by a filter made of fine stainless steel wool. In this study, we constructed a prototype of a desktop-type HGMS system using a cryocooler-cooled LTS magnet and conducted preliminary experiments on trapping the nano-sized magnetic particles. Furthermore, we investigated the magnetic field distribution and magnetic force around a magnetic wire in the filter by means of a numerical simulation.

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  • Over-Current Characteristics of a 20-m-Long YBCO Model Cable 査読

    Xudong Wang, Hiroshi Ueda, Atsushi Ishiyama, Masashi Yagi, Shinichi Mukoyama, Masayoshi Ohya, Takato Masuda, Naoji Kashima, Shigeo Nagaya, Yuh Shiohara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   19 ( 3 )   1722 - 1726   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    To achieve large current capacity and mechanical flexibility, high-temperature superconductor (HTS) power transmission cables consist of a number of YBCO coated conductors, which are assembled and wound spirally on a Cu former. In practical applications, superconducting cables might be subjected to short-circuit fault currents that are 10 to 30 times the operating current. Therefore, in order to ensure the stability and feasibility of HTS power cables and protect them from fault currents, it is important to estimate the redistribution of the transport current and electromagnetic coupling among the conductor layer, shield layer, and Cu former. In this study, we carried out experiments on a 20-m-long YBCO model cable, which was composed of two jointed 10-m-long YBCO model cables. Over-current with a peak of 31.8 kA(rms) and a duration of 2.02 s was applied to the model cable. We performed numerical simulations using a newly developed computer program based on the 3D finite element method (FEM) in order to clarify the electromagnetic and thermal behaviors of the YBCO model cable in the presence of an over-current.

    DOI: 10.1109/TASC.2009.2018316

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  • Degradation Characteristics of YBCO-Coated Conductors Subjected to Overcurrent Pulse 査読

    Atsushi Ishiyama, Yukiyasu Nishio, Hiroshi Ueda, Naoji Kashima, Masami Mori, Tomonori Watanabe, Shigeo Nagaya, Masashi Yagi, Shinichi Mukoyama, Takato Machi, Yuh Shiohara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   19 ( 3 )   3483 - 3486   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    YBCO tapes are expected to be used in future high temperature superconducting (HTS) applications because of their good characteristics at high temperatures and in high applied magnetic fields. In applications to electric power devices such as transmission cables, transformers, and fault current limiters, the HTS conductors will be subjected to short-circuit fault currents that are 10 to 30 times the normal operating current. These overcurrents are greater than the critical current, and degrade or burn-out the HTS conductors. Therefore, it is important to clarify the mechanism of the degradation caused by such overcurrent pulses. We carried out preliminary experiments on damage caused by overcurrent pulse drive, focusing on the temperature limitation without suffering degradation for overcurrent pulse operation. A 10-mm-wide YBCO tape was cut into 2-mm-wide sample tapes by a laser beam, and the sample tapes were soldered on silver-deposited 100-thick copper plates. Overcurrent tests were carried out on these sample tapes and I(c) degradation was investigated. In addition the contact interface between YBCO and the Ag layer or buffer layer before and after the overcurrent drives has been investigated in order to clarify the correlation between the degradation and delamination of sample tapes.

    DOI: 10.1109/TASC.2009.2018734

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  • Radioactivity of YBCO and Bi-2223 Tapes Under Low Energy Neutron Flux 査読 国際誌

    Hiroshi Ueda, Atsushi Ishiyama, Nobuyuki Miyahara, Naoji Kashima, Shigeo Nagaya

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   19 ( 3 )   2872 - 2876   2009年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    The quality of high-temperature superconductors ( HTSs) is rapidly increasing, and they can be used in power systems such as SMES systems and in industries as Si single-crystal growth pullers. In the future, HTS conductors are expected to be used for the magnets in nuclear fusion reactors or accelerators. In such applications, HTS conductors will be exposed to radiation. As a result, HTS conductors become radioactive making the operation and maintenance of the reactors or accelerators difficult; this also leads to an increase in the amount of nuclear waste generated. Therefore, we carry out experiments on the radiation damage in HTS conductors to study the characteristics of HTS conductors in radiation environments and to create an industrial database of the radiation effects on HTSs. We also carry out radioactive analyses on HTS conductors in order to clarify the relationship between the irradiation dose and the activity of HTS conductors. In this study, we prepared YBCO and Bi-2223 tapes and carried out the following preliminary experiments: ( a) irradiation of the sample HTS tapes with 2-MeV neutrons at room temperature without transport current and (b) study of neutron-induced radioactivity by gamma-ray spectrometry using a Ge detector after the irradiation.

    DOI: 10.1109/TASC.2009.2017713

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  • Accurate Position Control of Active Magnetic Levitation Using Sphere-Shaped HTS Bulk for Inertial Nuclear Fusion 査読

    Yoshihiro Ishigaki, Hiroshi Ueda, Koh Agatsuma, Atsushi Ishiyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   19 ( 3 )   2133 - 2136   2009年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have been developing an active magnetic levitation system, which is composed of a field-cooled disk-shaped or sphere-shaped high-temperature superconducting bulks (HTS bulks) and vertically piled ring-shaped electromagnets without an iron core. We suppose that this active magnetic levitation system can be applied to inertial nuclear fusion. In inertial nuclear fusion, one of the most important issues is to achieve high-accuracy position control of the fusion fuel, which consists of deuterium and tritium in order to evenly illuminate the entire surface of the target. Therefore, active magnetic levitation is applied to the levitation and position control of a sphere-shaped superconducting capsule containing nuclear fusion fuel. In this study, we designed and constructed a three-coil position control system in order to achieve the stable levitation of the sphere-shaped HTS bulk with a diameter of 5 mm by using the numerical simulation based on the hybrid finite element and boundary element analysis. Then, we carried out the experiments on the position control and restoring force characteristics of the sphere-shaped HTS bulk in the constructed levitation system.

    DOI: 10.1109/TASC.2009.2017898

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  • 数値シミュレーションによるNb3Sn素線の波状曲げ変形時の超電導特性の評価 査読

    村上陽之, 植田浩史, 石山敦士, 小泉徳潔, 奥野清

    電気学会論文誌B(電力・エネルギー部門誌)   128-B ( 6 )   853 - 859   2008年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1541/ieejpes.128.853

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  • Transient stability characteristics of a 1-m single-layer YBCO cable 査読 国際誌

    Atsushi Ishiyama, Xudong Wang, Hiroshi Ueda, Masashi Yagi, Shinichi Mukoyama, Naoji Kashima, Shigeo Nagaya, Yuh Shiohara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   18 ( 2 )   1228 - 1231   2008年6月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    YBCO tapes are expected to be used in future high temperature superconductor (HTS) applications as they have better J(c) characteristics at high temperatures and in high magnetic fields. For power applications such as transmission cables, YBCO tapes and a copper former are connected in parallel and they might be subjected to a short-circuit fault current that is 10 to 30 times the normal operating current. Therefore the over-current behavior, including the hot-spot and the distribution of transport current between the copper-laminated YBCO tapes and the copper former, is very important to examine the stability and feasibility of the cable. This paper describes the experimental results for over-current pulses of a 1-m single-layer cable fabricated with five copper-laminated YBCO tapes and a copper former. Further, we performed numerical simulations by using a newly developed computer program based on the 3D finite element method.

    DOI: 10.1109/TASC.2008.920610

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  • Assessment of Cryogenic Thermography System Using Commercial Fluorescent Paints on Their Applicability to Visualization of Normal-Zone Propagation in YBCO Coated Conductor 査読 国際誌

    Atsushi Ishiyama, Motokazu Tsuchiya, Hiroshi Ueda, Yuh Shiohara

    IEEE Transactions on Applied Superconductivity   17 ( 2 )   3765 - 3768   2007年6月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2007.899124

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  • Numerical Simulation of Critical Current and n-Value in ${\rm Nb}_{3}{\rm Sn}$ Strand Subjected to Bending Strain 査読 国際誌

    H. Murakami, A. Ishiyama, H. Ueda, N. Koizumi, K. Okuno

    IEEE Transactions on Applied Superconductivity   17 ( 2 )   1394 - 1397   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2007.898113

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  • A Criterion for Determining Stabilizer Thickness of YBCO Coated Conductors Based on Coil Protection 査読 国際誌

    Atsushi Ishiyama, Hiroshi Ueda, Taketoshi Ando, Hironori Naka, Sadanori Bamba, Yuh Shiohara

    IEEE Transactions on Applied Superconductivity   17 ( 2 )   2430 - 2433   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2007.897998

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  • Degradation of YBCO Coated Conductors Due to Over-Current Pulse 査読 国際誌

    Atsushi Ishiyama, Yasutake Tanaka, Hiroshi Ueda, Yuh Shiohara, Takato Machi, Yasuhiro Iijima, Takashi Saitoh, Naoji Kashima, Masami Mori, Tomonori Watanabe, Shigeo Nagaya

    IEEE Transactions on Applied Superconductivity   17 ( 2 )   3509 - 3512   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2007.899708

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  • Transient Stability Characteristics of Parallel-Connected YBCO Coated Conductors for Power Transmission Cables 査読 国際誌

    Atsushi Ishiyama, Takuya Iwata, Hiroshi Ueda, Shinichi Mukoyama, Yuh Shiohara

    IEEE Transactions on Applied Superconductivity   17 ( 2 )   1672 - 1675   2007年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2007.898005

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  • Development of Pipeline Transporter System Using Pinning Effect of High-Temperature Superconducting Bulks 査読 国際誌

    H.. Ueda, M.. Tsuchiya, A.. Ishiyama

    IEEE Transactions on Applied Superconductivity   17 ( 2 )   2323 - 2326   2007年6月

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    担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2007.899966

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  • Fundamental characteristics and 3D electromagnetic analysis for magnetic levitation transporter using YBCO superconductors 査読 国際誌

    Hiroshi Ueda, Mami Iwamoto, Yuhya Kudo, Atsushi Ishiyama

    ELECTRICAL ENGINEERING IN JAPAN   159 ( 2 )   44 - 54   2007年4月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SCRIPTA TECHNICA-JOHN WILEY & SONS  

    A magnetic levitation device with two-dimensional movement, the so-called "levitating X-Y transporter," has been developed. In order to develop a working levitating X-Y transporter, it is necessary to clarify the levitation characteristics, such as the lift force, levitation height, and stability against mechanical disturbances. In this paper, we examine the lift and the restoring force experimentally and propose a new simulation program based on the three-dimensional hybrid finite and boundary element method to analyze the dynamic behavior of electromagnetic characteristics of YBCO bulk. Using the numerical simulation and experiments, we investigated a suitable arrangement of permanent magnets to enhance the levitation characteristics. We also designed a levitating transporter which can carry a load of 200 kg with a gap of 16 mm. (C) 2007 Wiley Periodicals, Inc.

    DOI: 10.1002/eej.20220

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  • Numerical Simulation of the Critical Current and n-Value ${\rm Nb}_{3}{\rm Sn}$ Strand Subjected to Bending Strain 査読 国際誌

    M. Hirohashi, H. Murakami, A. Ishiyama, H. Ueda, N. Koizumi, K. Okuno

    IEEE Transactions on Applied Superconductivity   16 ( 2 )   1721 - 1724   2006年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2006.871310

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  • 3D Electromagnetic Analysis of Levitating Transporter Using Bulk Superconductor 査読 国際誌

    H. Ueda, S. Azumaya, S. Tsuchiya, A. Ishiyama

    IEEE Transactions on Applied Superconductivity   16 ( 2 )   1092 - 1095   2006年6月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2006.871280

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  • Lift and Restoring Force Characteristics Evaluation of Levitating X-Y Transporter Using HTS Bulks 査読 国際誌

    Y. Kudou, H. Ueda, A. Ishiyama

    IEEE Transactions on Appiled Superconductivity   15 ( 2 )   2230 - 2233   2005年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2005.850567

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  • Operational Characteristics of Linear Synchronous Actuator With Field-Cooled HTS Bulk Secondary 査読 国際誌

    A. Sato, H. Ueda, A. Ishiyama

    IEEE Transactions on Appiled Superconductivity   15 ( 2 )   2234 - 2237   2005年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2005.849619

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  • Transient Thermal Characteristics of Cryocooler-Cooled HTS Coil for SMES 査読 国際誌

    A. Ishiyama, M. Yanai, T. Morisaki, H. Ueda, S. Akita, S. Kouso, Y. Tatsuta, H. Abe, K. Tasaki

    IEEE Transactions on Appiled Superconductivity   15 ( 2 )   1879 - 1882   2005年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2005.849321

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  • Lift and restoring force characteristics of a levitating X–Y transporter using high-temperature superconducting bulks 査読 国際誌

    M Iwamoto, H Ueda, A Ishiyama

    Superconductor Science and Technology   17 ( 8 )   1042 - 1045   2004年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.1088/0953-2048/17/8/017

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  • Preliminary experiments of a tubular linear actuator in the vertical direction using YBCO bulk 査読 国際誌

    A Sugawara, H Ueda, A Ishiyama

    Superconductor Science and Technology   17 ( 5 )   S176 - S179   2004年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.1088/0953-2048/17/5/017

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  • Dynamic characteristics and finite element analysis of a magnetic levitation system using a YBCO bulk superconductor 査読 国際誌

    H Ueda, A Ishiyama

    Superconductor Science and Technology   17 ( 5 )   S170 - S175   2004年5月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP Publishing  

    DOI: 10.1088/0953-2048/17/5/016

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  • YBCO線材の常電導転移・伝播特性評価 査読

    石山敦士, 柳井正浩, 植田浩史, 飯島康裕, 斉藤隆, 塩原融

    低温工学   39 ( 2 )   560 - 566   2004年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2221/jcsj.39.560

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  • 着磁されたバルク超電導体の交流磁界印加特性 査読

    植田浩史, 森崎徹, 石山敦士

    電気学会論文誌B(電力・エネルギー部門誌)   124 ( 11 )   1357 - 1364   2004年

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    担当区分:筆頭著者, 責任著者   記述言語:日本語  

    DOI: 10.1541/ieejpes.124.1357

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  • バルク超電導体を用いた磁気浮上装置のための基礎特性評価と3次元電磁界解析 査読

    植田浩史, 岩本真実, 久藤勇哉, 石山敦士

    電気学会論文誌B(電力・エネルギー部門誌)   124 ( 10 )   1200 - 1208   2004年

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1541/ieejpes.124.1200

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  • A new type of active-Maglev system using YBCO bulk and multiple electromagnets 査読 国際誌

    R. Kamoshida, H. Ueda, A. Ishiyama

    IEEE Transactions on Appiled Superconductivity   13 ( 2 )   2157 - 2160   2003年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2003.813023

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  • Performance evaluation of continuous levitation in an active-maglev system using YBCO bulk and multiple electromagnets 査読 国際誌

    H Ueda, H Hayashi, A Ishiyama, M Tsuda

    ELECTRICAL ENGINEERING IN JAPAN   141 ( 2 )   25 - 33   2002年11月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SCRIPTA TECHNICA-JOHN WILEY & SONS  

    We have designed and constructed a new type of active-maglev system using YBCO bulk and two electromagnets and have demonstrated that levitation height was remarkably improved by continuous levitation. In the active-maglev system, however, the upper and lower coils differed in the coil size and an iron plate beneath the lower coil was used to enhance the magnetic field around the bulk. Considering the real application to maglev transporter in the axial direction, we must realize continuous leviation using a larger number of electromagnets without such iron plate and enable the levitation height to be controlled freely. In this paper, we demonstrate continuous levitation while controlling the leviation height using three- and five-electromagnet systems and investigate electromagnetic behavior within the bulk using an FEM computer program. (C) 2002 Wiley Periodicals, Inc.

    DOI: 10.1002/eej.10055

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  • 6.6kV級磁気遮へい型超電導限流器の試設計と有限要素法による動作特性評価 査読

    門裕之, 市川路晴, 植田浩史, 石山敦士

    電気学会論文誌B(電力・エネルギー部門誌)   122-B ( 8 )   944 - 950   2002年8月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1541/ieejpes1990.122.8_944

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  • Characteristics of active-maglev system using YBCO bulk and multiple electromagnets 査読 国際誌

    H Ueda, H Hayashi, A Ishiyama, M Tsuda

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   372 ( 3 )   1466 - 1469   2002年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    One useful feature of the active-maglev system is that levitation height is adjustable by varying operating current in electromagnets. To improve the levitation height, we have designed and constructed a new type of active-maglev system with two electromagnets instead of using a larger single electromagnet. The levitation height, as well as stability, was remarkably improved by adjusting the operating current of each electromagnet individually. Although the bulk is levitated up to high position, the lower electromagnet is continued to operate in continuous levitation using multiple electromagnets. It is waste that the lower electromagnet is continued to operate. The required energy for the electromagnet operation should be minimized. In this paper, we tried to realize continuous levitation with keeping the total operating current constant in five-electromagnet active-maglev system and investigate electromagnetic behavior within the bulk using a newly developed FEM computer program. Continuous levitation was successfully achieved under the desired operating condition. Agreements between experiment and analysis were excellent. (C) 2002 Published by Elsevier Science B.V.

    DOI: 10.1016/S0921-4534(02)01050-X

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  • Trapped field characteristics of Y-Ba-Cu-O bulk in time-varying external magnetic field 査読

    H Shimizu, H Ueda, M Tsuda, A Ishiyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   12 ( 1 )   820 - 823   2002年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    It is very important to clarify characteristics of trapped field in HTS bulk exposed to an external AC magnetic field in application of high-temperature superconducting bulk to motors, magnetic levitation systems, bulk magnets and so on. We have experimentally investigated the transition of trapped field while applying external AC magnetic field to a disk-shaped YBCO bulk. The observed trapped-field attenuation is different from that by flux creep, i.e., zero external field. It may be considered that the trapped-field attenuation is affected by external AC magnetic field, particularly temperature rise due to AC loss. In this paper, electromagnetic behaviors within the bulk exposed to external AC magnetic field, especially supercurrent distribution, are investigated numerically using a simulation code based on the finite element method (FEM) considering voltage-current (E-J) characteristic. We focus on the relationship between the transition of supercurrent distribution within the bulk while applying external AC magnetic field and both n-value of E-J characteristic and temperature rise by AC loss.

    DOI: 10.1109/TASC.2002.1018527

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  • Trial production and experiment of linear actuator with double-sided primary and HTS bulk secondary 査読

    S Sadakata, H Ueda, M Tsuda, A Ishiyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   12 ( 1 )   824 - 827   2002年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    It is expected that HTS bulk materials are applied to various electric devices. In a previous work we have fabricated and tested a linear actuator with single-sided primary and HTS bulk secondary. The linear actuator was comprised of zero-field-cooled YBCO bulk for secondary (mover) and copper windings with iron core (primary). The primary was excited by a three-phase VVVF power source to provide sinusoidal traveling field. To improve the characteristics of the linear actuator, we newly designed and fabricated a linear actuator with double-sided primary and zero-field-cooled HTS bulk secondary. We measured starting thrust force and magnetic field distribution in the air gap between the bulk and the primary iron core at the stationary state. To evaluate dynamic characteristics of the linear actuator, we numerically investigated electromagnetic behavior within the bulk exposed to time-varying magnetic field using a simulation program based on the finite element method (FEM) taking the voltage-current (E-J) characteristic into consideration. Computed starting thrust force, displacement characteristic and field distribution between the bulk and the primary iron core were compared with the experimental results. Agreement between experiments and analyses was good. We also investigated the electromagnetic characteristics as a linear synchronous actuator with double-sided primary and field-cooled HTS bulk secondary.

    DOI: 10.1109/TASC.2002.1018528

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  • Static and dynamic characteristics in levitating X-Y transporter using HTS bulks 査読 国際誌

    Y. Teranishi, H. Ueda, M. Tsuda, A. Ishiyama

    IEEE Transactions on Applied Superconductivity   12 ( 1 )   911 - 914   2002年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1109/tasc.2002.1018548

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  • A new type of active-maglev system using YBCO bulk and multiple electromagnets 査読

    Hayashi, H., Ueda, H., Tsuda, M., Ishiyama, A., Hamajima, K.

    IEEE Transactions on Applied Superconductivity   12 ( 1 )   907 - 910   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We present a, new type of active-maglev system consisting of a disk-shaped superconducting bulk (YBCO) and multiple electromagnets. Using the active-maglev system composed of five electromagnets, we demonstrated. continuous levitation and verified that the levitation height, as well as stability, could be remarkably improved by adjusting operating current of electromagnet individually. Electromagnetic behavior within the bulk was investigated numerically by the finite element method (FEM) adopting the Bean model. Agreements of levitation force and height between experiment and analysis were good. Suitable electromagnet operation for continuous levitation in terms of consumed operating energy was also investigated. It was found in analysis that continuous levitation could be realized efficiently by adopting a three-electromagnet operation and the operating procedure is applicable to multiple-electromagnet system. Therefore, based on the assumption of constant total operating current of three electromagnets, we numerically investigated the relationship between the operating procedure and levitation force in a five-electromagnet system as a function of levitation height. Maximum allowable weight of float (superconducting bulk and load) was evaluated through the estimation of minimum levitation force during continuous levitation as a function of air gap between electromagnets.

    DOI: 10.1109/TASC.2002.1018547

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  • バルク超電導体と複数の電磁石による鉛直方向連続アクティブ磁気浮上の特性評価 査読

    植田浩史, 林浩幹, 石山敦士, 津田理

    電気学会論文誌B(電力・エネルギー部門誌)   121-B ( 10 )   1331 - 1338   2001年10月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1541/ieejpes1990.121.10_1331

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  • Characteristics of lift and restoring force in HTS bulk - Application to two-dimensional Maglev transporter 査読

    Y Sanagawa, H Ueda, M Tsuda, A Ishiyama, S Kohayashi, S Haseyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   11 ( 1 )   1797 - 1800   2001年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    One of the advantages of magnetic levitation using high-temperature superconducting (BTS) bulk is that stable levitation can be achieved without any control systems. We have been investigating the electromagnetic behaviors of HTS bulk to realize a two-dimensional magnetic levitating transporter without any aired guides, The characteristics of lift and stability are key parameters to design and optimize such a device. We measured the lift and the restoring force of a YBCO bulk, displaced by a distance in lateral direction, for various field-cooling conditions and permanent-magnet arrangements, Both lift and restoring force are closely related to the air gap in the field-cooling process, distance between the permanent magnets, number of permanent magnets, and permanent magnet arrangement, that is, external magnetic field distribution. The most suitable arrangement of permanent magnets depends on the required levitation height and the weight of the levitating part. It can be considered that the size of the levitating part and geometry are also very important to determine the optimal arrangement in the maglev device.

    DOI: 10.1109/77.920135

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  • 複数の電磁石を用いたバルク超電導体の連続アクティブ磁気浮上 査読

    津田理, 真川康弘, 林浩幹, 植田浩史, 石山敦士

    低温工学   36 ( 2 )   68 - 78   2001年2月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2221/jcsj.36.68

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  • バルク超電導体特性の温度・磁界依存性と磁気遮へい型超電導限流器の動作特性解析 査読

    門裕之, 市川路晴, 植田浩史, 石山敦士

    低温工学   35 ( 5 )   246 - 254   2000年5月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2221/jcsj.35.246

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▼全件表示

書籍等出版物

  • 次世代高温超電導線材のコイル化技術

    次世代高温超電導線材のコイル化技術調査専門委員会( 担当: 分担執筆)

    電気学会  2019年2月 

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    総ページ数:28   記述言語:日本語 著書種別:調査報告書

    高磁場での高い臨界電流特性と高い機械的強度を併せ持つ次世代高温超電導線材技術が進展し、これを用いた広範な機器応用が期待されている。2015 年に設置された「次世代高温超電導線材のコイル化技術調査専門委員会」では、次世代高温超電導線材を用いた最新のコイル化技術のうち、特に(a)最新の次世代高温超電導線材の諸特性、(b)遮蔽電流磁場解析法、(c)高温超電導コイルの安定性と保護の考え方、を中心に調査を行った。本報告書はこれら最新の技術動向をまとめたものである。

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  • イットリウム系高温超電導マグネット技術の研究開発動向

    イットリウム系高温超電導コイル化技術調査専門委員会( 担当: 分担執筆)

    電気学会  2016年3月 

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    総ページ数:55   記述言語:日本語 著書種別:調査報告書

    イットリウム系高温超電導線材は,高磁場での超電導特性と機械的特性が優れており,広範な機器への応用が期待されている。ところがイットリウム系高温超電導マグネットはコイル化技術が十分に体系化されていない。そこで,2013年に「イットリウム系高温超電導コイル化技術調査専門委員会」を設立し,イットリウム系高温超電導線材のコイル化技術の調査を実施した。本報告書は,その調査結果をまとめたものである。最初に,イットリウム系超電導マグネットの基礎技術的な課題として,超電導特性の劣化,遮蔽電流磁場,コイル保護,永久電流接続を中心に,現状と課題をまとめた。次に,イットリウム系高温超電導機器を実装する際に出会う技術課題をまとめた。最後に,イットリウム系高温超電導機器の開発状況と課題をまとめた。斬新な内容も含む技術報告書に仕上がったものと自負している。

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MISC

  • 無絶縁REBCO パンケーキ・コイルにおける数値解析技術 ‐解析手法の比較および解析事例‐ 招待 査読

    野口聡, 植田浩史, 石山敦士

    低温工学   54 ( 2 )   103‐110(J‐STAGE)   2019年3月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2221/jcsj.54.103

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  • 高温超電導応用機器の数値解析技術の現状 招待 査読

    植田浩史, 野口聡, 石山敦士

    低温工学   54 ( 2 )   2019年3月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2221/jcsj.54.89

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  • 応用電磁気学:超電導機器応用のための電磁界数値解析III -超電導特性と電磁界解析- 招待 査読

    植田 浩史, 石山 敦士

    低温工学   48 ( 9 )   472 - 484   2013年9月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2221/jcsj.48.472

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  • 高温超電導コイルの安定性評価基準とクエンチ検出・保護 -SMES 用伝導冷却YBCO コイルを例として- 招待 査読

    石山 敦士, 植田 浩史, 王 旭東, 長屋 重夫, 渡部 智則

    低温工学   48 ( 4 )   141 - 150   2013年4月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2221/jcsj.48.141

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  • 応用電磁気学:超電導機器応用のための電磁界数値解析II -有限要素法と境界要素法- 招待 査読

    植田 浩史, 石山 敦士

    低温工学   48 ( 2 )   83 - 94   2013年2月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2221/jcsj.48.83

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  • 応用電磁気学:超電導機器応用のための電磁界数値解析I -電磁界数値解析の基礎- 招待 査読

    植田 浩史, 石山 敦士

    低温工学   47 ( 11 )   623 - 632   2012年11月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2221/jcsj.47.623

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  • 「スケルトン・サイクロトロン」用REBCOコイルシステムの開発

    石山敦士, 野口聡, 植田浩史, 渡部智則, 長屋重夫, 福田光宏

    電気学会研究会資料(Web)   ( MC-21-001-008/ASC-21-001-008 )   2021年7月

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  • REBCO線材の優れた特性を活かすコイル化技術

    石山敦士, 野口聡, 植田浩史, 渡部智則, 長屋重夫, 福田光宏

    電気学会研究会資料(Web)   ( MC-21-001-008/ASC-21-001-008 )   2021年7月

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  • 無絶縁REBCOコイルシステムにおける励磁遅れを考慮した遮蔽電流磁場の低減法

    小久保早希, 村上将吾, 石山敦士, 植田浩史, 野口聡

    電気学会研究会資料(Web)   ( MC-21-001-008/ASC-21-001-008 )   2021年7月

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  • 高温超電導スケルトンサイクロトロンにおける可変出力エネルギーを考慮した遮蔽電流磁場の数値解析

    日比祐太, 白井航大, 緒方隆充, 石山敦士, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 福田光宏

    電気学会全国大会講演論文集(CD-ROM)   2021   2021年3月

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  • 無絶縁REBCO高温超電導コイルシステムにおける励磁遅れを考慮した遮蔽電流磁場解析

    小久保早希, 上田聡美, 村上将吾, 石山敦士, 植田浩史, 野口総

    電気学会全国大会講演論文集(CD-ROM)   2021   2021年3月

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  • 高温超電導スケルトンサイクロトロンにおけるREBCO線材細線化による遮蔽電流磁場低減の検討

    糸日谷浩平, 白井航大, 石山敦士, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 福田光宏

    電気学会全国大会講演論文集(CD-ROM)   2021   2021年3月

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  • コイル最外層に金属リングを施した無絶縁高温超電導コイルの熱的安定性に関する研究

    西川大亮, 小林大剛, 宮本康平, 井上良太, 植田浩史, KIM SeokBeom

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 積層REBCO導体で巻線された高温超電導コイルの結合電流・遮蔽電流分布解析

    植田浩史, 徳永佳祐, 内藤敬介, 井上良太, KIM SeokBeom

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 無絶縁高温超電導コイルの反復窒素冷却による巻線間接触抵抗測定に関する検討

    宮本康平, 小林大剛, 西川大亮, 井上良太, 植田浩史, KIM SeokBeom, 野口聡

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 無絶縁REBCO超電導コイルにおける磁場精度向上のための通電波形の提案

    村上将吾, 上田聡美, 石山敦士, 植田浩史, 野口聡

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 高温超電導スケルトンサイクロトロンにおける可変出力エネルギーを考慮した遮蔽電流磁場の数値解析

    白井航大, 緒方隆充, 石山敦士, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 福田光宏

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 永久電流1.3GHz(30.5T)NMRマグネットの技術開発

    柳澤吉紀, PIAO Renzhong, 武田泰明, 山崎俊夫, 末富佑, 濱田衛, 斉藤一功, 西島元, 北口仁, 植田浩史, 山口高史, 大木康太郎, 永石竜起, 下山淳一, 前田秀明

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 分散型遺伝的アルゴリズムを用いた小型MRI用HTSマグネットの基本形状の検討

    大澤慶博, 井上雄太, 廣瀬瞭, 井上良太, 植田浩史, KIM SeokBeom

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 新開発柔軟性極細Nb<sub>3</sub>Al超電導線材の臨界特性測定

    福田響, 木村諒, 井上良太, 植田浩史, KIM SeokBeom, 菊池章弘, 飯嶋安男

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年12月

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  • 超極細Nb<sub>3</sub>Al単芯線及び撚線

    菊池章弘, 飯嶋安男, 平田和人, 二森茂樹, 西島元, 北口仁, 瀧川博幸, 土谷悦子, 山本優, 河野雅俊, 木村基良, 今仁順也, 永松純, 大坪正人, 一瀬中, 大内徳人, 有本靖, WANG Xudong, ZONG Zanguo, 土屋清澄, 青木和之, 川井正徳, KIM SeokBeom, 植田浩史, 井上良太, 木原工, 中村武恒

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 高磁場REBCO無絶縁コイルの電磁・熱応力解析による補強構造評価

    徳永佳祐, 内藤敬介, 井上良太, KIM SeokBeom, 植田浩史

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • HTSコイルを用いた鉄道用非接触給電システムの熱的安定性を考慮した運転条件の検討

    井上良太, 植田浩史, KIM SeokBeom, 津田理

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 巻線・冷却・励磁過程を考慮した高磁場REBCOコイルの応力・ひずみ分布の数値解析評価

    植田浩史, 徳永佳祐, 内藤敬介, 井上良太, KIM SeokBeom

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 高温超電導スケルトン・サイクロトロンにおける非円形無絶縁REBCOコイルの補強構造に関する検討

    三宅雄大, 仲井悠貴, 井上良太, KIM Seokbeom, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 福田光宏, 石山敦士

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 伝導冷却超電導応用機器に向けた柔軟性極細Nb<sub>3</sub>Al超電導線材の臨界特性測定

    木村諒, 福田響, 井上良太, 植田浩史, KIM SeokBeom, 菊池章弘, 飯嶋安男

    低温工学・超電導学会講演概要集   100th   2020年12月

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  • 高温超電導体移動子を用いた三次元アクチュエータの駆動電流波形による動的特性

    木庭駿, 前田裕貴, 井上良太, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • 小型MRI用高温超電導マグネットの線材使用量を考慮した基本形状設計に関する研究

    井上雄太, 大澤慶博, 井上良太, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • サイクロトロン応用に向けた非円形高温超電導コイルの補強構造に関する検討

    仲井悠貴, 三宅雄大, KIM SeokBeom, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 福田光宏, 石山敦士

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • 医薬用タンパク質の高勾配磁気分離用磁性フィルターの開発

    KIM UiYeong, 森優輝, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • 高温超電導コイルにおける遮蔽電流に起因する不均一電磁応力の分布解析

    内藤敬介, 徳永佳祐, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • 交流通電による無絶縁高温超電導コイルの巻線間接触抵抗測定

    小林大剛, 宮本康平, 西川大亮, 井上良太, 植田浩史, KIM SeokBeom, 野口聡

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • 小型NMR用高温超電導バルク体マグネットの磁場特性向上に関する基礎研究

    佐々木晟人, 河村康平, 井上良太, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • 小型単板磁気試験器による炭素鋼鋼管材の磁気特性測定

    SONG Chaeeun, 久米一輝, 井上良太, 植田浩史, KIM SeokBeom, 廿日出好

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • 高温超電導コイルを用いた非接触給電システムの商用周波数における電力伝送特性

    高宮裕志, 井上良太, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • サイクロトロン応用に向けた非円形コイルの熱応力を考慮した補強構造の検討

    三宅雄大, 仲井悠貴, KIM SeokBeom, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 福田光宏, 石山敦士

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   71st   2020年10月

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  • スケルトン・サイクロトロン開発のための高温超電導コイルの要素技術開発

    久松万里子, 福田光宏, 依田哲彦, 神田浩樹, 中尾政夫, 安田裕介, 友野大, KOAY Hui Wen, 森田泰之, 武田佳次朗, 原隆文, 大本恭平, CHONG Tsunhim, 石山敦士, 野口聡, 植田浩史, 福井聡, 鎌倉恵太, 松原雄二, 三上行雄, 鶴留武尚, 高橋伸明, 吉田潤, 平山貴士, 長屋重夫, 渡部智則

    日本加速器学会年会(Web)   17th   2020年9月

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  • 高温超電導スケルトンサイクロトロンにおける遮蔽電流磁場低減法の検討

    白井航大, 緒方隆充, 稲垣善太, 石山敦士, 植田浩史, 野口聡

    電気学会全国大会講演論文集(CD-ROM)   2020   2020年3月

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  • 無絶縁REBCO超電導コイルの励磁特性に関する解析評価

    村上将吾, 稲垣善太, 上田聡美, 石山敦士, 植田浩史, 野口聡

    電気学会全国大会講演論文集(CD-ROM)   2020   2020年3月

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  • 高勾配磁気分離を利用した医薬用タンパク質精製装置の開発

    植田浩史, KIM SeokBeom

    Annual Report of the Okayama Foundation for Science and Technology   ( 28 )   2019年10月

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  • 小型NMR/MRI装置用高温超電導コイルの形状設計に関する基礎研究

    大澤慶博, 石井翔己, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   70th   2019年10月

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  • REBCOコイル励消磁時の遮蔽電流に起因する電磁力解析

    細谷野里香, 徳永佳祐, 盛川瑛亮, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   70th   2019年10月

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  • 三次元超電導アクチュエータにおける動的安定性向上のための固定子形状に関する研究

    前田裕貴, 中嶋淳夫, 植田浩史, KIM SeokeBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   70th   2019年10月

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  • サイクロトロン用高温超電導マグネットの巻線精度が発生磁場に及ぼす影響

    三宅雄大, 粟津佑太, KIM SeokBeom, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 吉田潤, 福田光宏, 石山敦士

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   70th   2019年10月

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  • 保護用金属テープを施した無絶縁高温超電導コイルの熱的安定性向上に関する研究

    宮本康平, 西川大亮, 立田貴裕, 植田浩史, KIM SeokBoem

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   70th   2019年10月

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  • 核医学治療用高温超電導スケルトン・サイクロトロンの開発(1)―REBCOコイルシステムの開発課題―

    石山敦士, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 吉田潤, 福田光宏, 東達也

    低温工学・超電導学会講演概要集   98th   77   2019年5月

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  • MRI用REBCOコイルシステムにおける遮蔽電流に起因する不整磁場の低減法:電流制御波形の最適化について

    緒方隆充, 稲垣善太, 石山敦士, 植田浩史, 野口聡

    低温工学・超電導学会講演概要集   98th   123   2019年5月

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  • 核医学治療用高温超電導スケルトン・サイクロトロンの開発(4)―実証用高温超電導小型マルチコイルシステムの機械特性解析―

    粟津佑太, KIM SeokBeom, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 吉田潤, 福田光宏, 石山敦士

    低温工学・超電導学会講演概要集   98th   80   2019年5月

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  • 核医学治療用高温超電導スケルトン・サイクロトロンの開発(3)―実証用高温超電導小型マルチコイルシステムの遮蔽電流解析―

    植田浩史, 粟津佑太, KIM SeokBeom, 野口聡, 渡部智則, 長屋重夫, 吉田潤, 福田光宏, 石山敦士

    低温工学・超電導学会講演概要集   98th   79   2019年5月

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  • 銅メッキを施した細線化REBCO線材で巻線された超電導コイルの遮蔽電流磁場低減法:電流制御法適用時の挙動解析

    石崎比奈子, 上田聡美, 稲垣善太, 石山敦士, 植田浩史, 野口聡

    低温工学・超電導学会講演概要集   98th   121   2019年5月

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  • 銅メッキを施した細線化REBCO線材で巻線された超電導コイルの遮蔽電流磁場低減法:電流制御法適用時の不整磁場低減効果

    上田聡美, 稲垣善太, 石山敦士, 植田浩史, 野口聡

    低温工学・超電導学会講演概要集   98th   122   2019年5月

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  • 核医学治療用高温超電導スケルトン・サイクロトロンの開発(2)―実証用高温超電導小型マルチコイルシステムの設計―

    野口聡, 植田浩史, 粟津佑太, KIM SeokBeom, 渡部智則, 長屋重夫, 吉田潤, 福田光宏, 石山敦士

    低温工学・超電導学会講演概要集   98th   78   2019年5月

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  • MRI用REBCOコイルシステムにおける遮蔽電流による不正磁場の低減法(その1):細線化と電流制御併用法の効果

    上田聡美, 伊東慶太, 稲垣善太, 石山敦士, 植田浩史, 野口聡

    電気学会全国大会講演論文集(CD-ROM)   2019   ROMBUNNO.5‐169   2019年3月

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  • MRI用REBCOコイルシステムにおける遮蔽電流に起因する不整磁場の低減法(その3):ヒステリシスを利用したオーバーシュート法

    石崎比奈子, 稲垣善太, 伊東慶太, 石山敦士, 植田浩史, 野口聡

    電気学会全国大会講演論文集(CD-ROM)   2019   ROMBUNNO.5‐171   2019年3月

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  • MRI用REBCOコイルシステムにおける遮蔽電流に起因する不整磁場の低減法(その2):細線化と電流制御の併用法の最適化

    緒方隆充, 稲垣善太, 伊東慶太, 石山敦士, 植田浩史, 野口聡

    電気学会全国大会講演論文集(CD-ROM)   2019   ROMBUNNO.5‐170   2019年3月

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  • 完全非接触でのSQUID式超音波ガイド波検査技術の開発-その1-

    横内祐紀, 東雄貴, 窪田章吾, 寺若友博, 植田浩史, KIM S.B., 廿日出好

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   66th   2019年3月

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  • 次世代医療用スケルトンサイクロトロンに用いる高温超電導コイルシステムの電磁力解析

    粟津佑太, KIM SeokBeom, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 吉田潤, 福田光宏, 石山敦士

    低温工学・超電導学会講演概要集   97th   88   2018年11月

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  • 無絶縁REBCOマグネットのターン間接触抵抗の測定方法

    野口聡, 野口聡, 立田貴裕, 植田浩史, KIM Seokbeom, 石山敦士

    低温工学・超電導学会講演概要集   97th   98   2018年11月

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  • ヒステリシスを利用したオーバーシュート法による遮蔽電流不整磁場の低減法:9.4T級ヒト全身用MRIコイルを対象として

    稲垣善太, 伊東慶太, 石山敦士, 植田浩史, 野口聡

    低温工学・超電導学会講演概要集   97th   79   2018年11月

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  • 高強度小型多機能スケルトンサイクロトロンの開発―超電導コイルシステム要求仕様―

    石山敦士, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 吉田潤, 鶴留武尚, 高橋伸明, 三上行雄, 福田光宏

    低温工学・超電導学会講演概要集   96th   52   2018年5月

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  • 高強度小型多機能スケルトンサイクロトロンの開発―遮蔽電流磁場解析―

    粟津佑太, KIM SeokBeom, 植田浩史, 野口聡, 石山敦士, 渡部智則, 長屋重夫, 吉田潤, 鶴留武尚, 高橋伸明, 三上行雄, 福田光宏

    低温工学・超電導学会講演概要集   96th   78   2018年5月

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  • REBCOコイルにおける部分的細線化による遮蔽電流磁場低減効果:9.4‐T級ヒト全身用MRIコイルを対象として

    稲垣善太, 小曽根裕一, 伊東慶太, 石山敦士, 植田浩史, 野口聡

    低温工学・超電導学会講演概要集   96th   71   2018年5月

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  • 高強度小型多機能スケルトンサイクロトロンの開発―超電導コイル設計―

    野口聡, 植田浩史, 石山敦士, 渡部智則, 長屋重夫, 吉田潤, 鶴留武尚, 高橋伸明, 三上行雄, 福田光宏

    低温工学・超電導学会講演概要集   96th   79   2018年5月

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  • 高強度小型多機能スケルトンサイクロトロンの開発―全体概要―

    福田光宏, 石山敦士, 植田浩史, 野口聡, 渡部智則, 長屋重夫, 吉田潤, 鶴留武尚, 高橋伸明, 三上行雄

    低温工学・超電導学会講演概要集   96th   51   2018年5月

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  • 9.4T‐MRIにおけるREBCO線材の細線化による遮蔽電流磁場への影響の解析

    稲垣善太, 伊東慶太, 小曽根裕一, 石山敦士, 植田浩史, 野口聡

    電気学会全国大会講演論文集(CD-ROM)   2018   ROMBUNNO.5‐161   2018年3月

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  • サイクロトロン用高温超電導マグネットの遮蔽電流磁場評価

    粟津佑太, KIM Seok Beom, 植田浩史, 野口聡, 石山敦士, 渡部智則, 長屋重夫, 吉田潤, 鶴留武尚, 高橋伸明, 三上行雄, 福田光宏

    電気学会全国大会講演論文集(CD-ROM)   2018   ROMBUNNO.5‐160   2018年3月

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  • 医薬用タンパク質の高勾配磁気分離用磁性フィルターの断面形状設計

    安部拓郎, 窪田幹久, 森優輝, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   69th   2018年

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  • 医薬用タンパク質の高勾配磁気分離用磁性フィルターの周囲の磁性粒子の挙動解析

    森優輝, 窪田幹久, KIM Seok Beom, 植田浩史

    電気学会全国大会講演論文集(CD-ROM)   2018   2018年

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  • 500MHz LTS/REBCO NMRの遮蔽電流磁場解析

    盛川瑛亮, 小泉智暉, KIM SeokBeom, 植田浩史, 濱田衞, 柳澤吉紀, 前田秀明

    低温工学・超電導学会講演概要集   96th   2018年

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  • 500MHz LTS/REBCO NMRにおける遮蔽電流磁場解析による磁場均一度評価

    盛川瑛亮, 徳永佳祐, 小泉智暉, KIM SeokBeom, 植田浩史, 柳澤吉紀

    低温工学・超電導学会講演概要集   97th   2018年

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  • 高温超電導コイルの巻線内電磁力解析

    植田浩史, 徳永佳祐, 盛川瑛亮, 小泉智暉, KIM SeokBeom

    低温工学・超電導学会講演概要集   97th   2018年

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  • REBCOコイルの遮蔽電流に起因する巻線内電磁力解析

    徳永佳祐, 盛川瑛亮, 小泉智暉, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   69th   2018年

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  • 高勾配磁気分離を利用した医薬用タンパク質精製装置の開発

    植田浩史

    岡山工学振興会ニュース   ( 111 )   2018年

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  • マルチフィラメント高温超電導線材で巻線された高温超電導コイルの結合電流解析

    植田浩史, 小泉智暉, 盛川瑛亮, KIM SeokBeom

    電気学会研究会資料   ( MC-18-001-023/ASC-18-001-023 )   2018年

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  • 高温超電導コイルの小型化とインダクタンス制御に関する研究

    西川大亮, 立田貴裕, 大草晴義, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   69th   2018年

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  • 単板磁気試験器を用いた電磁鋼板の2Hコイル法による磁界強度測定法の検討

    太田葵, 藤本賢哉, 大原慎也, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   69th   2018年

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  • Halbach配列の永久磁石によるシリンダ形状マグネットの磁場均一度向上に関する研究

    廣瀬瞭, 喜来雅人, 富坂良和, 石井翔己, 小谷健斗, 植田浩史, KIM Seok Beom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   69th   2018年

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  • A new thin approximation simulation method of screening current in REBCO tape considering tape's thickness

    S. Noguchi, A. Ishiyama, H. Ueda

    2017 IEEE International Magnetics Conference, INTERMAG 2017   2017年8月

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    記述言語:英語   出版者・発行元:Institute of Electrical and Electronics Engineers Inc.  

    An extremely high field homogeneity is required for applications of NMR and MRI magnets.

    DOI: 10.1109/INTMAG.2017.8007825

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  • Study on the Rotation Properties and the Design Issue of Non-Contact Rotating System Using HTS Bulks and Permanent Magnets

    R. Okamura, S. B. Kim, Y. Ozaki, H. Ueda

    Journal of Physics: Conference Series   871 ( 1 )   702 - 709   2017年7月

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    記述言語:英語   出版者・発行元:Institute of Physics Publishing  

    In previous study, non-contact rotating system consisting of the ring-shaped high temperature superconducting (HTS) bulks, ring-shaped permanent magnets (PMs) and stator coil was proposed. In this system, HTS bulks were magnetized by PMs and PMs were levitated with strong restoring force. In our previous study, we have constructed the rotating system with the ring-shaped HTS bulks with ID 20 mm, OD 60 mm, and 15-mm thickness. However, since these bulks costs too much, we switched to use HTS bulks with ID 20 mm, OD 60 mm, and 5-mm-thickness to miniaturize the system. However, this system have potential to fail the radial stability of rotating shaft. Therefore, we focused on the rotating and the radial restoring force in terms of the stability of the rotating shaft in the rotating system with 5-mm thickness HTS bulks.

    DOI: 10.1088/1742-6596/871/1/012096

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  • Numerical study to obtain the improved field homogeneity of HTS bulk magnet with enlarged inner diameter for compact NMR

    S. Fukada, S. B. Kim, T. Nakagawa, R. Nomura, H. Ueda

    Journal of Physics: Conference Series   871 ( 1 )   1488 - 1495   2017年7月

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    記述言語:英語   出版者・発行元:Institute of Physics Publishing  

    The strength and homogeneity of the magnetic field required for NMR relaxometry device are 1.5 T and 150 ppm/cm3 respectively. It is relatively easy to generate the trapped magnetic field over 1.5 T at 77.4 K using the stacked HTS bulks, and 150 ppm/cm3 field homogeneity was obtained using the fabricated field compensation methods on HTS bulks magnet with 20 mm inner diameter. However, it is still hard to obtain 150 ppm/cm3 field homogeneity without field compensation methods. In this paper, in order to improve the trapped magnetic field homogeneity, the HTS bulk magnet with enlarged inner diameter was proposed and studied as the functions of size and shape of HTS bulk. The analytical study based on FEM was carried out to optimize the shape of HTS bulk magnet with enlarged inner diameter.

    DOI: 10.1088/1742-6596/871/1/012088

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  • Fundamental study on the magnetic field control method using multiple HTS coils for Magnetic Drug Delivery System

    R. Hirano, S. B. Kim, T. Nakagawa, Y. Tomisaka, H. Ueda

    Journal of Physics: Conference Series   871 ( 1 )   969 - 976   2017年7月

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    記述言語:英語   出版者・発行元:Institute of Physics Publishing  

    The magnetic drug delivery system (MDDS) is a key technology to reduce the side effects in the medical applications, and the magnetic force control is very important issue in MDDS. In this application, the strength of magnetic field and gradient required to MDDS devices are 54 mT and 5.5 T/m, respectively. We proposed the new magnetic force control system that consists of the multiple racetrack HTS magnets. We can control the magnetic field gradient along the longitudinal direction by the arrangement of the multiple racetrack HTS magnets and operating current of each magnet. When the racetrack HTS magnets were used, the critical current was reduced by the self-magnetic field. Therefore, the shape design of HTS magnet to reduce the magnet field into the surface of HTS tapes was required. Therefore, the electromagnetic analysis based on finite element method (FEM) was carried out to design and optimize the shape of multiple racetrack HTS magnet. We were able to suppress the reduction of critical current by placing the magnetic substance at upper and lower side of the HTS magnets. It was confirmed that obtained maximum values of magnetic field strength and field gradient were 33 mT and 0.18 T/m, respectively.

    DOI: 10.1088/1742-6596/871/1/012104

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  • 高磁場コイルシステムの研究開発 ―高磁場MRI用高温超電導磁石の開発― 招待 査読

    宮﨑 寛史, 岩井 貞憲, 戸坂 泰造, 野村 俊自, 来栖 努, 植田 浩史, 野口 聡, 石山 敦士, 浦山 慎一, 福山 秀直

    低温工学   52 ( 4 )   224 - 233   2017年7月

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    記述言語:日本語   掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.2221/jcsj.52.224

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  • 9.4T級ヒト全身用MRI用コイルにおける遮蔽電流による不整磁場の解析・評価

    伊東慶太, 石山敦士, 植田浩史, 野口聡, 宮崎寛史, 戸坂泰造, 野村俊自, 来栖努

    低温工学・超電導学会講演概要集   94th   133   2017年5月

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  • REBCOパンケーキコイルの遮蔽電流磁場簡易計算法

    宮尾亮介, 植田浩史, 石山敦士, HAHN Seungyoung, 野口聡

    低温工学・超電導学会講演概要集   94th   9   2017年5月

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  • 銅メッキ付き多芯REBCO線材における遮蔽電流による不整磁場の低減効果

    武藤優真, 石山敦士, 小泉智暉, 植田浩史, KIM Seok Beom, 野口聡

    低温工学・超電導学会講演概要集   94th   7   2017年5月

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  • 9.4T級ヒト全身用MRI用コイルにおける遮蔽電流による不整磁場の解析

    伊東慶太, 中園浩平, 石山敦士, 植田浩史, 野口聡, 宮崎寛史, 戸坂泰造, 野村俊自, 来栖努, 浦山慎一, 福山秀直

    電気学会全国大会講演論文集(CD-ROM)   2017   ROMBUNNO.5‐115   2017年3月

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  • 高磁場コイルシステムの研究開発

    宮﨑 寛史, 岩井 貞憲, 戸坂 泰造, 野村 俊自, 来栖 努, 植田 浩史, 野口 聡, 石山 敦士, 浦山 慎一, 福山 秀直

    低温工学   52 ( 4 )   224 - 233   2017年

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    記述言語:日本語   出版者・発行元:公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)  

    &lt;p&gt;A project for developing of RE&lt;sub&gt;1&lt;/sub&gt;Ba&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;7-&amp;delta;&lt;/sub&gt; (REBCO) magnets to be utilized in ultrahigh-field magnetic resonance imaging (MRI) was started in 2013. Our final targets are 9.4 T MRI systems for whole-body and brain imaging. In this project, two different development approaches towards the final target were planned. One is a small REBCO coil that can generate 10 Tclass magnetic fields, which is the same level as the target magnetic field. The other is a conduction-cooled 1.5 T REBCO MRI magnet that has a room-temperature bore of 396 mm, which is as large as those of mid-sized model magnets. These results were reflected in the design of a conduction-cooled 9.4 T REBCO magnet for whole-body MRI systems.&lt;/p&gt;

    DOI: 10.2221/jcsj.52.224

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  • 銅メッキ付き多芯REBCOテープ線材で巻線された高温超電導コイルの遮蔽電流評価実験と解析

    植田浩史, 石山敦士, 柳澤吉紀, 前田秀明

    低温工学・超電導学会講演概要集   94th   2017年

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  • 医療用タンパク質の高勾配磁気分離用磁性フィルターの周囲の磁性粒子の挙動解析

    森優輝, 窪田幹久, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • 超電導接合を用いた永久電流1.3GHz NMRに向けて(1)~磁石の概念設計と要素技術開発~

    柳澤吉紀, 斉藤一功, 濱田衞, 西島元, 北口仁, 松本真治, 野口隆志, 植田浩史, 永石竜起, PIAO Renzhong, 高橋雅人, 前田秀明

    低温工学・超電導学会講演概要集   95th   2017年

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  • REBCOコイルにおける細線化処理による遮蔽電流不整磁場低減効果の解析:9.4T級ヒト全身用MRIコイルを対象として

    伊東慶太, 石山敦士, 植田浩史, 野口聡

    低温工学・超電導学会講演概要集   95th   2017年

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  • マルチフィラメント高温超電導線材で巻線された高温超電導コイルの遮蔽電流解析

    植田浩史, 小泉智暉, 盛川瑛亮, KIM SeokBeom

    低温工学・超電導学会講演概要集   95th   2017年

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  • 三次元超電導アクチュエータの床・壁走行間の高温超電導バルク体移動子の動的特性に関する研究

    山崎尊雄, 平塚祐介, 中嶋淳夫, 植田浩史, KIM SeokBeom

    低温工学・超電導学会講演概要集   95th   2017年

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  • 無絶縁高温超電導コイルを想定した高温超電導線材間の電気的接触抵抗の圧力依存性に関する研究

    立田貴裕, 大草晴義, 民健太郎, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • REBCO線材における細線化による遮蔽電流に起因する不整磁場の低減効果

    武藤優真, 中園浩平, 小曽根裕一, 石山敦士, 植田浩史

    電気学会全国大会講演論文集(CD-ROM)   2017   2017年

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  • 銅メッキ付き多芯REBCOテープ線材における遮蔽電流磁場の低減効果

    植田浩史, 武藤優真, 小曽根裕一, 石山敦士

    電気学会金属・セラミックス研究会資料   MC-17 ( 1-20 )   2017年

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  • サイクロトロン応用のための高温超電導マグネットの発生磁場精度評価

    粟津佑太, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • 単板磁気試験器を用いた電磁鋼板の磁気特性測定方法に関する研究

    藤本賢哉, 中川拓弥, 大原慎也, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • 小型NMR装置用のハルバッハ配列永久磁石の磁場均一度向上に関する研究

    美濃孝明, 野村亮太, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • 連結高温超電導バルク体移動子を用いた三次元アクチュエータの動的特性に関する研究

    中嶋淳夫, 平塚祐介, 山崎尊雄, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • 小型NMR relaxometry装置用の高温超電導マグネットの形状に関する基礎研究

    石井翔己, 菅生圭登, 喜来雅人, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • 核変換による高レベル放射性廃棄物の大幅な低減・資源化(加速器技術)(3)核変換のための高強度小型サイクロトロンの概念検討

    福田光宏, 土岐博, 関亮一, 篠塚勉, 依田哲彦, 神田浩樹, 畑中吉治, 植田浩史, 安田裕介, 久米世大

    日本原子力学会秋の大会予稿集(CD-ROM)   2017   2017年

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  • 高温超電導バルク体による積層構造小型NMR装置用マグネットの試料測定空間拡張に関する基礎研究

    乙倉孝輔, 深田進, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • 鉄リングによる超電導マグネットの磁場補正に関する研究

    有岡直紀, 野村亮太, 富坂良和, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • 銅メッキ付きマルチフィラメント化REBCO線材の電流分布解析

    盛川瑛亮, 小泉智暉, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   68th   2017年

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  • REBCOマルチコイルにおける遮蔽電流による不整磁場の低減法 (金属・セラミックス 超電導機器合同研究会・超電導応用ならびに材料関連技術)

    小曽根 裕一, 中園 浩平, 王 韜, 石山 敦士, 植田 浩史, 野口 聡, 宮崎 寛史, 戸坂 泰造, 野村 俊自, 来栖 努

    電気学会研究会資料. MC   2016 ( 13 )   43 - 47   2016年6月

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    記述言語:日本語   出版者・発行元:電気学会  

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  • 高磁場MRI用高温超電導磁石の開発 (金属・セラミックス 超電導機器合同研究会・超電導応用ならびに材料関連技術)

    宮崎 寛史, 岩井 貞憲, 戸坂 泰造, 野村 俊自, 来栖 努, 植田 浩史, 野口 聡, 石山 敦士, 浦山 慎一, 福山 秀直

    電気学会研究会資料. MC   2016 ( 13 )   49 - 51   2016年6月

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    記述言語:日本語   出版者・発行元:電気学会  

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  • (50T・500A/mm<sup>2</sup>・5GPa)‐REBCO超電導コイルシステムの開発

    石山敦士, 我妻洸, 齋藤隆, 野口聡, 植田浩史, KIM SeokBeom, 渡部智則, 長屋重夫

    低温工学・超電導学会講演概要集   93rd   114   2016年5月

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  • 高磁場MRI用高温超電導磁石の開発(16年春)―工業製品化を前提とするMRI用REBCOコイルシステムの開発―

    石山敦士, 植田浩史, 植田浩史, 野口聡, 野口聡, 浦山慎一, 福山秀直, 宮崎寛史, 戸坂泰造, 野村俊自, 来栖努

    低温工学・超電導学会講演概要集   93rd   6   2016年5月

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  • 高磁場MRI用高温超電導磁石の開発(16年春)―9.4T高温超電導MRI磁石設計―

    宮崎寛史, 岩井貞憲, 宇都達郎, 大谷安見, 戸坂泰造, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 植田浩史, 野口聡, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   93rd   3   2016年5月

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  • 高磁場MRI用高温超電導磁石の開発(‘16年春)―9.4Tヒト全身用MRIコイルの最適化設計と不整磁場評価―

    植田浩史, 植田浩史, 野口聡, 野口聡, 石山敦士, 岩井貞憲, 戸坂泰造, 宮崎寛史, 野村俊自, 来栖努, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   93rd   5   2016年5月

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  • 高磁場MRI用高温超電導磁石の開発(16年春)―REBCOマルチコイルにおける遮蔽電流による不整磁場の低減法―

    小曽根裕一, WANG Tao, 石山敦士, 植田浩史, 野口聡, 宮崎寛史, 戸坂泰造, 野村俊自, 来栖努

    低温工学・超電導学会講演概要集   93rd   4   2016年5月

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  • 高磁場MRI用高温超電導磁石の開発(16年春)―伝導冷却1.5T‐MRI磁石の試験結果―

    宮崎寛史, 岩井貞憲, 宇都達郎, 大谷安見, 戸坂泰造, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 植田浩史, 野口聡, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   93rd   2   2016年5月

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  • 高磁場MRI用高温超電導磁石の開発(16年春)―全体概要―

    戸坂泰造, 宮崎寛史, 岩井貞憲, 宇都達郎, 大谷安見, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 植田浩史, 野口聡, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   93rd   1   2016年5月

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  • 9.4Tヒト全身用MRIコイルにおける遮蔽電流による不整磁場と磁場均一度の評価

    中園浩平, 松見絢子, WANG Tao, 石山敦士, 植田浩史, 野口聡, 宮崎寛史, 戸坂泰造, 野村俊自, 来栖努, 浦山慎一, 福山秀直

    電気学会超電導機器研究会資料   ASC-16 ( 1-12 )   1‐6   2016年2月

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  • 小型NMR用高温超電導バルクマグネットの挿入コイルによる磁場均一度向上に関する研究

    山本雅彦, 深田進, 北条勝也, 野村亮太, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   67th   2016年

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  • 医療用タンパク質の高勾配磁気分離装置用磁性フィルターの開発に関する基礎検討

    窪田幹久, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   67th   2016年

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  • 3次元超電導アクチュエータの連続回転動作に伴う捕捉磁場減衰特性と移動子の動的特性

    平塚祐介, 山崎尊雄, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   67th   2016年

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  • 無絶縁高温超電導コイルの熱擾乱に対する過渡安定性向上とコイルの小型化に関する研究

    大草晴義, 民健太郎, 金本太石, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   67th   2016年

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  • REBCO超電導コイルの線材内電流分布解析

    小泉智暉, 植田浩史, KIM SeokBeom

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   67th   2016年

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  • 非接触型超電導回転機の回転数向上のための固定子コイル設計に関する基礎研究

    小崎裕介, 岡村亮太, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   67th   2016年

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  • 複数の高温超電導レーストラックコイルを用いたMDDS用マグネット開発のための基礎研究

    富坂良和, 平野亮磨, 中川拓弥, KIM Seokbeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   67th   2016年

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  • ハルバッハ配列永久磁石を用いた小型NMR用マグネットの磁場校正用磁石による磁場均一度向上に関する研究

    大原慎也, 北条勝也, 野村亮太, 深田進, KIM SeokBeom, 植田浩史

    電気・情報関連学会中国支部連合大会講演論文集(CD-ROM)   67th   2016年

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  • 10T級MRI用高温超電導磁石の開発-REBCOマルチコイルにおける遮蔽電流による不整磁場の評価試験と解析-

    小曽根裕一, 持田歩, WANG Tao, 石山敦士, 植田浩史, 宮崎寛史, 戸坂泰造, 野村俊自, 来栖努

    電気学会全国大会講演論文集(CD-ROM)   2016   2016年

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  • 高磁場MRI用高温超電導磁石開発の進捗(15年秋)―極小口径10Tコイルの開発―

    岩井貞憲, 宮崎寛史, 大谷安見, 宇都達郎, 戸坂泰造, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 植田浩史, 野口聡, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   92nd   184   2015年12月

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  • 高磁場MRI用高温超電導磁石開発の進捗(15年秋)―進捗概要―

    戸坂泰造, 宮崎寛史, 岩井貞憲, 宇都達郎, 大谷安見, 高橋政彦, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 植田浩史, 野口聡, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   92nd   183   2015年12月

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  • 高磁場MRI用高温超電導磁石開発の進捗(15年秋)9.4Tヒト全身用MRIコイルにおける遮蔽電流による不整磁場と磁場均一度の評価

    松見絢子, WANG Tao, 石山敦士, 植田浩史, 野口聡, 宮崎寛史, 戸坂泰造, 野村俊自, 来栖努

    低温工学・超電導学会講演概要集   92nd   186   2015年12月

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  • 高磁場MRI用高温超電導磁石開発の進捗(15年秋)―伝導冷却1.5T‐MRI磁石の開発―

    宮崎寛史, 岩井貞憲, 宇都達郎, 大谷安見, 戸坂泰造, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 植田浩史, 野口聡, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   92nd   185   2015年12月

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  • 高磁場MRI用高温超電導磁石開発の進捗(‘15年春)―極小口径10Tコイルの遮蔽電流磁場解析―

    植田浩史, 石山敦士, 野口聡, 岩井貞憲, 戸坂泰造, 宮崎寛史, 野村俊自, 来栖努, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   91st   150   2015年5月

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  • 高磁場MRI用高温超電導磁石開発の進捗(15年春)―1/2サイズコイル試験―

    宮崎寛史, 岩井貞憲, 大谷安見, 高橋政彦, 戸坂泰造, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   91st   148   2015年5月

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  • 高磁場MRI用高温超電導磁石開発の進捗(15年春)―均一磁場コイル最適化設計―

    野口聡, 石山敦士, 植田浩史, 宮崎寛史, 戸坂泰造, 野村俊自, 来栖努, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   91st   151   2015年5月

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  • 高磁場MRI用高温超電導磁石開発の進捗(15年春)―含浸無絶縁コイル試験―

    岩井貞憲, 宮崎寛史, 大谷安見, 戸坂泰造, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   91st   149   2015年5月

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  • 高磁場MRI用高温超電導磁石開発の進捗(15年春)―プロジェクト進捗概要―

    戸坂泰造, 宮崎寛史, 岩井貞憲, 大谷安見, 高橋政彦, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 野口聡, 浦山慎一, 福山秀直

    低温工学・超電導学会講演概要集   91st   147   2015年5月

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  • 高磁場MRI用高温超電導マグネットの開発

    戸坂泰造, 宮崎寛史, 岩井貞憲, 大谷安見, 高橋政彦, 田崎賢司, 野村俊自, 来栖努, 石山敦士, 植田浩史, 野口聡, 浦山慎一, 福山秀直

    電気学会全国大会講演論文集(CD-ROM)   2015   ROMBUNNO.5-S8-4   2015年3月

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    低温工学・超電導学会講演概要集   87th   2013年

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    低温工学・超電導学会講演概要集   87th   2013年

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    低温工学・超電導学会講演概要集   87th   2013年

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  • 次世代超電導サイクロトロンの開発:遮へい電流の影響の検討

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  • 次世代超電導サイクロトロンの開発:コイル形状の設計最適化

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    大嶽晃, 岩熊成卓, 佐藤寿洋, 長谷吉二, 富岡章, 和泉輝郎, 塩原融, 山田穣, 植田浩史

    低温工学・超電導学会講演概要集   86th   2012年

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  • 次世代超電導サイクロトロンの開発:高温超電導線材の中性子照射特性(放射化評価)

    宮原信幸, 狩野開, 道辻健太, 矢崎真二郎, 柄澤彰良, WANG Xudong, 石山敦士, 植田浩史

    低温工学・超電導学会講演概要集   86th   2012年

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  • 次世代超電導サイクロトロンの開発:YBCOパンケーキモデルコイルにおける巻線精度評価

    狩野開, 道辻健太, 矢崎真二郎, 柄澤彰良, WANG Xudong, 石山敦士, 宮原信幸, 植田浩史, 鹿島直二, 長屋重夫

    低温工学・超電導学会講演概要集   86th   2012年

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  • 次世代超電導サイクロトロンの開発:YBCOパンケーキコイルの磁場精度解析

    WANG Tao, 石山敦士, 植田浩史, 福田光宏, 畑中吉治, 長屋重夫, 鹿島直二, 宮原信幸

    低温工学・超電導学会講演概要集   86th   2012年

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  • 風力用5MW Y系超伝導同期発電機の設計検討

    大嶽晃, 岩熊成卓, 長谷吉二, 佐藤寿洋, 富岡章, 山田穣, 植田浩史, 和泉輝郎, 塩原融

    電気関係学会九州支部連合大会講演論文集(CD-ROM)   65th   2012年

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  • SMES用Y系超電導コイルにおけるクエンチ検出方法の検討

    増井裕太, 室町和輝, 鈴木貴裕, 大西秀明, 石山敦士, 渡部智則, 平野直樹, 長屋重夫, 植田浩史

    電気学会全国大会講演論文集   2012 ( 5 )   2012年

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  • 加速器応用を想定した高温超電導コイルの遮へい電流と発生磁場分布の3次元解析

    植田浩史, 福田光宏, 畑中吉治, 石山敦士

    電気学会全国大会講演論文集   2012 ( 5 )   2012年

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  • 次世代超電導サイクロトロンの開発:パンケーキコイルの高精度巻線技術

    石山敦士, WANG Xudong, 長屋重夫, 鹿島直二, 植田浩史

    低温工学・超電導学会講演概要集   86th   2012年

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  • SMES用YBCOコイルを想定した伝導冷却下での銅モデルコイルの伝熱特性評価

    増井裕太, 琴寄拓哉, 石山敦士, 渡部智則, 平野直樹, 長屋重夫, 植田浩史

    低温工学・超電導学会講演概要集   86th   2012年

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  • 次世代超電導サイクロトロンの開発:高温超電導線材の中性子照射特性(超電導特性)

    道辻健太, 狩野開, 矢崎真二郎, 柄澤彰良, WANG Xudong, 石山敦士, 植田浩史, 宮原信幸

    低温工学・超電導学会講演概要集   86th   2012年

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  • SMES用伝導冷却YBCOコイルにおける常電導転移検出実験

    増井裕太, 大西秀明, 石山敦士, 渡部智則, 平野直樹, 長屋重夫, 植田浩史

    低温工学・超電導学会講演概要集   86th   2012年

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  • 医薬用たんぱく質の高速分離・精製・回収用高勾配磁気分離システムのフィルターの検討

    植田浩史, 我妻洸, 古瀬充穂, 淵野修一郎, 柁川一弘, 石山敦士, 小泉達雄

    低温工学・超電導学会講演概要集   84th   2011年

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  • 中性子照射による高温超電導体への影響

    琴寄拓哉, 神林佑, 柄澤彰良, 矢崎真二郎, 石山敦士, 宮原信幸, 植田浩史

    低温工学・超電導学会講演概要集   85th   2011年

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  • 500kW REBCO超電導同期モータの設計検討

    友田慎一朗, 緒方俊之, 岩熊成卓, 長谷吉二, 佐藤寿洋, 富岡章, 今野雅行, 山田穣, 植田浩史, 和泉輝郎, 塩原融

    電気学会全国大会講演論文集   2011 ( 5 )   2011年

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  • Y系高温超電導モータの開発

    山田穣, 植田浩史, 和泉輝郎, 齊藤隆, 塩原融, 岩熊成卓, 石山敦士

    低温工学・超電導学会講演概要集   85th   2011年

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  • 次世代高温超電導サイクロトロンのための高温超電導コイルの遮へい電流による磁場の空間的・時間的変化-(2)計算例-

    植田浩史, 福田光宏, 畑中吉治, 石山敦士

    低温工学・超電導学会講演概要集   85th   2011年

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  • SMES用YBCO超電導コイルのクエンチ検出と保護に関する数値解析評価

    石山敦士, 大西秀明, WANG Xudong, 植田浩史, 渡部智則, 平野直樹, 長屋重夫

    低温工学・超電導学会講演概要集   85th   2011年

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  • SMES応用を想定したYBCOコイルのクエンチ検出と保護

    大西秀明, 青木佳明, 鈴木貴裕, 室町和輝, WANG Xudong, 石山敦士, 式町浩二, 平野直樹, 長屋重夫, 植田浩史

    低温工学・超電導学会講演概要集   84th   2011年

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  • 次世代超電導サイクロトロンの設計:電磁応力評価

    柄澤彰良, 石山敦士, 植田浩史, 福田光宏, 畑中吉治, 長屋重夫, 鹿島直二, 宮原信幸

    低温工学・超電導学会講演概要集   85th   2011年

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  • 次世代高温超電導サイクロトロンの試設計

    石山敦士, WANG Xudong, 植田浩史, 福田光宏, 畑中吉治, 長屋重夫, 鹿島直二, 宮原信幸, 横田渉

    低温工学・超電導学会講演概要集   84th   2011年

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  • 次世代高温超電導サイクロトロンの開発

    石山敦士, WANG Xudong, 植田浩史, 福田光宏, 畑中吉治, 長屋重夫, 鹿島直二, 宮原信幸, 横田渉

    低温工学・超電導学会講演概要集   84th   2011年

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  • SMES用YBCO超電導コイルのクエンチ検出実験

    大西秀明, WANG Xudong, 石山敦士, 植田浩史, 渡部智則, 平野直樹, 長屋重夫

    低温工学・超電導学会講演概要集   85th   2011年

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  • 次世代重粒子線がん治療用超電導加速器「先進ハイブリッドサイクロトロン」の開発

    石山敦士, WANG Xudong, 福田光宏, 植田浩史, 畑中吉治, 長屋重夫, 鹿島直二, 宮原信幸, 横田渉

    電気学会全国大会講演論文集   2011 ( 5 )   2011年

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  • 高温超電導技術を活用した「先進ハイブリッド・サイクロトロン」の開発

    石山敦士, WANG Xudong, 福田光宏, 畑中吉治, 植田浩史, 長屋重夫, 鹿島直二, 宮原信幸

    電気学会超電導応用電力機器研究会資料   ASC-11 ( 1-14 )   2011年

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  • SMES応用を想定したYBCOコイルのクエンチ検出と保護

    石山敦士, WANG Xudong, 室町和輝, 式町浩二, 平野直樹, 長屋重夫, 植田浩史

    電気学会超電導応用電力機器研究会資料   ASC-11 ( 25-33 )   2011年

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  • 次世代重粒子線がん治療用超電導加速器「先進ハイブリッドサイクロトロン」の試設計

    石山敦士, WANG Xudong, 福田光宏, 植田浩史, 畑中吉治, 長屋重夫, 鹿島直二, 宮原信幸, 横田渉

    電気学会全国大会講演論文集   2011 ( 5 )   2011年

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  • 次世代高温超電導サイクロトロンのための高温超電導コイルの遮へい電流による磁場の空間的・時間的変化-(1)3次元電磁場解析モデルおよび定式化-

    植田浩史, 福田光宏, 畑中吉治, 石山敦士

    低温工学・超電導学会講演概要集   85th   2011年

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  • 超伝導線材ならびにコイル構成材料の耐放射線性に関する研究

    石山敦士, 植田浩史, 陸旭東, 青木徹, 神林佑, 宮原信幸

    NIRS-M (National Inst. of Radiological Sciences)   ( 233 )   2010年

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  • 次世代超電導サイクロトロンの開発

    石山敦士*, 植田浩史, 福田光宏, 鹿島直二, 長屋重夫, 畑中吉治, 宮原信幸, 横田渉

    電気学会超電導応用電力機器研究会資料   ASC-10 ( 17-27.29-39.41 )   2010年

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  • 66kV系統REBCO超電導モデルケーブルの過電流通電特性評価

    WANG Xudong, 植田浩史, 石山敦士, 大屋正義, 藤原昇

    低温工学・超電導学会講演概要集   82nd   2010年

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  • REBCO超電導線材の過電流パルス通電による特性劣化要因について

    金光雅也, 新井道生, WANG Xudong, 植田浩史, 石山敦士, 斉藤隆, 大松一也, 大屋正義, 和泉輝郎, 藤原昇

    低温工学・超電導学会講演概要集   82nd   2010年

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  • REBCO超電導線材の交流過電流通電特性

    児島健太郎, 百足弘史, WANG Xudong, 植田浩史, 石山敦士, 大屋正義, 大松一也, 藤原昇

    低温工学・超電導学会講演概要集   82nd   2010年

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  • SMES用伝導冷却Y系超電導モデルコイルの通電・伝熱特性評価

    鈴木貴裕, 室町和輝, 青木佳明, 植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    低温工学・超電導学会講演概要集   82nd   2010年

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  • 高温超電導線材の中性子照射実験

    神林佑, 青木徹, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 宮原信幸

    低温工学・超電導学会講演概要集   82nd   2010年

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  • 500kW REBCO超電導同期モータの設計検討

    友田慎一朗, 緒方俊之, 岩熊成卓, 長谷吉二, 佐藤寿洋, 富岡章, 今野雅行, 山田穣, 植田浩史, 和泉輝郎, 塩原融

    低温工学・超電導学会講演概要集   83rd   2010年

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  • 66kV系統超電導電力ケーブルの短絡事故を想定したREBCO超電導線材の交流過電流通電特性評価

    児島健太郎, 百足弘史, WANG Xudong, 植田浩史, 石山敦士, 大屋正義, 大松一也, 大熊武, 丸山修

    低温工学・超電導学会講演概要集   83rd   2010年

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  • 500kW REBCO超電導モータの設計検討

    友田慎一朗, 緒方俊之, 岩熊成卓, 長谷吉二, 佐藤寿洋, 富岡章, 山田穣, 植田浩史, 和泉輝郎, 塩原融

    電気関係学会九州支部連合大会講演論文集(CD-ROM)   63rd   2010年

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  • Y系coated conductorを用いたSMESコイルの交流損失評価

    柁川一弘, 船木和夫, 植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    超伝導システム科学研究センター報告   7   2010年

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  • YBCO超電導線材の交流過電流通電特性

    児島健太郎, 新井道生, 河野秀太郎, WANG Xudong, 植田浩史, 石山敦士, 大屋正義, 湯村洋康, 藤原昇

    電気学会全国大会講演論文集   2010 ( 5 )   2010年

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  • YBCO超電導線材の過電流パルス通電による特性劣化評価

    金光雅也, 新井道生, 百足弘史, WANG Xudong, 植田浩史, 石山敦士, 斉藤隆, 青木祐治, 八木正史, 藤原昇

    電気学会全国大会講演論文集   2010 ( 5 )   2010年

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  • 275kV系統YBCO超電導ケーブルの定常運転時の伝熱特性

    神谷侑司, 百足弘史, 佐藤俊祐, WANG Xudong, 植田浩史, 石山敦士, 八木正史, 藤原昇

    電気学会全国大会講演論文集   2010 ( 5 )   2010年

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  • 球状バルク超電導体のアクティブ磁気浮上における安定性評価

    WANG Tao, 陸旭棟, 青木徹, 阿部昂機, 植田浩史, 我妻洸, 石山敦士, 岩本晃史, 柳長門, 三戸利行

    電気学会全国大会講演論文集   2010 ( 5 )   2010年

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  • 粒子線がん治療用加速器応用を想定した高温超電導線材の中性子照射実験

    陸旭棟, 青木徹, 神林佑, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 宮原信幸

    電気学会超電導応用電力機器研究会資料   ASC-10 ( 1.3-9.11-16 )   2010年

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  • トロイダル配置された冷凍機伝導冷却SMES用YBCO超電導コイルの安定性と保護

    植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    電気学会超電導応用電力機器研究会資料   ASC-10 ( 1.3-9.11-16 )   2010年

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  • SMES用伝導冷却YBCO超電導コイルのクエンチ特性と保護

    石山敦士, 植田浩史, 式町浩二, 平野直樹, 長屋重夫

    電気学会超電導応用電力機器研究会資料   ASC-10 ( 17-27.29-39.41 )   2010年

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  • 銅メッキYBCO超電導線材の疲労特性試験

    鈴木貴裕, 川井優季, 青木佳明, 植田浩史, 石山敦士, 鹿島直二, 渡辺智則, 平野直樹, 山本潔

    電気学会全国大会講演論文集   2010 ( 5 )   2010年

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  • SMES用冷凍機伝導冷却Y系超電導コイルを想定した銅ダミーコイルの熱特性評価解析

    室町和輝, 青木佳明, 川井優季, 植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    電気学会全国大会講演論文集   2010 ( 5 )   2010年

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  • 高温超電導線材の中性子照射実験

    青木徹, 陸旭棟, 神林佑, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 宮原信幸

    電気学会全国大会講演論文集   2010 ( 5 )   2010年

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  • SMES用伝導冷却高温超電導コイルのクエンチ保護

    室町和輝, 鈴木貴裕, 青木佳明, 植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    低温工学・超電導学会講演概要集   82nd   2010年

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  • 医薬用たんぱく質の高速分離・精製・回収用高勾配磁気分離システムの回収率改善の検討

    植田浩史, 石山敦士, 我妻洸, 古瀬充穂, 淵野修一郎, 柁川一弘, 小泉達雄

    低温工学・超電導学会講演概要集   80th   2009年

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  • 医薬用たんぱく質の高速分離・精製・回収用高勾配磁気分離システムの回収率改善の検討

    植田浩史, 石山敦士, 我妻洸, 古瀬充穂, 淵野修一郎, 柁川一弘, 小泉達雄

    低温工学・超電導学会講演概要集   81st   2009年

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  • 高温超電導線材の疲労特性評価試験装置

    青木佳明, 川井優季, 植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    低温工学・超電導学会講演概要集   80th   2009年

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  • スラッシュ窒素の電気絶縁特性

    淵野修一郎, 古瀬充穂, 名取尚武, 池内正充, 大野隆介, 石山敦士, 植田浩史

    電気学会全国大会講演論文集   2009 ( 5 )   2009年

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  • スラッシュ窒素冷却下における高温超電導線材の過電流通電特性

    百足弘史, 瓜生季邦, 佐藤俊祐, WANG Xudong, 植田浩史, 石山敦士, 淵野修一郎, 古瀬充穂, 池内正充, 大野隆介

    低温工学・超電導学会講演概要集   80th   2009年

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  • コイル巻線化されたYBCO集合化導体の常電導伝播特性解析

    植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    低温工学・超電導学会講演概要集   80th   2009年

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  • トロイダル配置されたY系SMESコイルの保護動作

    植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    低温工学・超電導学会講演概要集   81st   2009年

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  • 66kV系統YBCO超電導ケーブルの過電流通電特性解析

    WANG Xudong, 植田浩史, 石山敦士, 大屋正義, 湯村洋康, 藤原昇, 塩原融

    低温工学・超電導学会講演概要集   80th   2009年

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  • YBCO超電導線材の過電流パルス通電による特性劣化試験

    新井道生, WANG Xudong, 植田浩史, 石山敦士, 斉藤隆, 青木祐治, 八木正史, 向山晋一, 吉積正晃, 和泉輝郎, 山田穣, 塩原融

    低温工学・超電導学会講演概要集   80th   2009年

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  • YBCO超電導線材の交流過電流通電特性

    百足弘史, 新井道生, 河野秀太郎, WANG Xudong, 植田浩史, 石山敦士, 斎藤隆, 青木裕治, 八木正史, 藤原昇

    低温工学・超電導学会講演概要集   81st   2009年

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  • 66kV系統高温超電導ケーブルの過電流通電特性評価

    瓜生季邦, 百足弘史, 佐藤俊祐, WANG Xudong, 植田浩史, 石山敦士, 大屋正義, 増田孝人, 藤原昇

    低温工学・超電導学会講演概要集   81st   2009年

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  • 断面構造の異なるNb<sub>3</sub>Sn素線のCIC導体内における超電導特性の評価

    梶谷秀樹, 植田浩史, 石山敦士, 村上陽之, 小泉徳潔, 奥野清

    低温工学・超電導学会講演概要集   80th   2009年

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  • 275kV級YBCO超電導電力ケーブルを想定した伝熱特性評価-絶縁層における誘電損失の影響-

    WANG Xudong, 植田浩史, 石山敦士, 八木正史, 藤原昇

    電気学会超電導応用電力機器研究会資料   ASC-09 ( 20-39 )   2009年

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  • 数値シミュレーションによるTFコイル用CIC導体内の電流分布解析

    梶谷秀樹, 植田浩史, 石山敦士, 村上陽之, 小泉徳潔, 奥野清

    低温工学・超電導学会講演概要集   81st   2009年

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  • 医薬用たんぱく質の高速分離・精製・回収用アフィニティー磁性ナノビーズ

    我妻洸, 淵野修一郎, 井村知弘, 古瀬充穂, 植田浩史, 石山敦士, 柁川一弘, 三宅新一, 五十嵐弘

    低温工学・超電導学会講演概要集   80th   2009年

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  • 球状バルク超電導体の浮上安定性評価

    植田浩史, 陸旭棟, 青木徹, 石山敦士, 岩本晃史, 柳長門, 三戸利行

    低温工学・超電導学会講演概要集   80th   2009年

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  • 275kV系統YBCO超電導ケーブルの定常運転時の伝熱特性

    瓜生季邦, 百足弘史, 佐藤俊祐, WANG Xudong, 植田浩史, 石山敦士, 八木正史, 齊藤隆, 青木裕治, 藤原昇, 塩原融

    低温工学・超電導学会講演概要集   80th   2009年

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  • YBCO超電導線材の過電流パルス通電による特性劣化試験

    新井道生, 百足弘史, 河野秀太郎, WANG Xundong, 植田浩史, 石山敦士, 斉藤隆, 青木祐治, 八木正史, 藤原昇

    低温工学・超電導学会講演概要集   81st   2009年

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  • 球状バルク超電導体のアクティブ磁気浮上における安定性評価

    WANG Tao, 陸旭棟, 青木徹, 阿部昂機, 植田浩史, 我妻洸, 石山敦士, 岩本晃史, 柳長門, 三戸利行

    低温工学・超電導学会講演概要集   81st   2009年

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  • YBCO超電導コイルの安定性と保護

    植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    低温工学・超電導学会講演概要集   81st   2009年

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  • 高温超電導線材の中性子照射実験

    青木徹, 陸旭棟, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 宮原信幸

    低温工学・超電導学会講演概要集   81st   2009年

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  • 275kV系統YBCO超電導ケーブルの過電流通電特性解析

    WANG Xudong, 植田浩史, 石山敦士, 八木正史, 藤原昇

    低温工学・超電導学会講演概要集   81st   2009年

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  • 銅メッキYBCO超電導線材の疲労特性試験

    青木佳明, 川井優季, 植田浩史, 石山敦士, 鹿島直二, 渡辺智則, 平野直樹, 山本潔

    低温工学・超電導学会講演概要集   81st   2009年

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  • YBCO超電導線材の過電流パルス通電による特性劣化-細線化・銅複合化の影響-

    新井道生, 河野秀太郎, 西尾幸恭, 植田浩史, 石山敦士, 塩原融, 鹿島直二, 長屋重夫, 八木正史, 向山晋一

    電気学会全国大会講演論文集   2009 ( 5 )   2009年

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  • YBCO超電導ケーブルの過電流通電特性

    WANG Xudong, 植田浩史, 石山敦士, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    電気学会全国大会講演論文集   2009 ( 5 )   2009年

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  • スラッシュ窒素冷却下における高温超電導線材の過電流通電特性(実験)

    瓜生季邦, 百足弘史, 佐藤俊祐, WANG Xudong, 植田浩史, 石山敦士, 淵野修一郎, 古瀬充穂, 池内正充, 大野隆介

    電気学会全国大会講演論文集   2009 ( 5 )   2009年

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  • YBCO超電導線材の疲労特性

    青木佳明, 田中洋輔, 川井優季, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 塩原融

    電気学会全国大会講演論文集   2009 ( 5 )   2009年

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  • YBCO超電導線材の過電流パルス通電試験前後における層間接触評価

    梶谷秀樹, 新井道生, 河野秀太郎, 西尾幸恭, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 八木正史, 向山晋一, 加藤英幸, 塩原融

    電気学会全国大会講演論文集   2009 ( 5 )   2009年

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  • スラッシュ窒素冷却下における高温超電導線材の過電流通電特性(数値解析)

    百足弘史, 瓜生季邦, 佐藤俊祐, WANG Xudong, 植田浩史, 石山敦士, 淵野修一郎, 古瀬充穂, 池内正充, 大野隆介

    電気学会全国大会講演論文集   2009 ( 5 )   2009年

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  • 高温超電導線材の耐放射線損傷試験

    宮原信幸, 石山敦子, 植田浩史, 鹿島直二, 長屋重夫

    NIRS-M (National Inst. of Radiological Sciences)   ( 224 )   2009年

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  • トロイド配置したY系SMES用パンケーキコイルの交流損失評価

    柁川一弘, 船木和夫, 植田浩史, 石山敦士, 式町浩二, 平野直樹, 長屋重夫

    電気学会超電導応用電力機器研究会資料   ASC-09 ( 20-39 )   2009年

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  • Transient stability characteristics of a 1-m single-layer YBCO cable

    Atsushi Ishiyama, Xudong Wang, Hiroshi Ueda, Masashi Yagi, Shinichi Mukoyama, Naoji Kashima, Shigeo Nagaya, Yuh Shiohara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   18 ( 2 )   1228 - 1231   2008年6月

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    YBCO tapes are expected to be used in future high temperature superconductor (HTS) applications as they have better J(c) characteristics at high temperatures and in high magnetic fields. For power applications such as transmission cables, YBCO tapes and a copper former are connected in parallel and they might be subjected to a short-circuit fault current that is 10 to 30 times the normal operating current. Therefore the over-current behavior, including the hot-spot and the distribution of transport current between the copper-laminated YBCO tapes and the copper former, is very important to examine the stability and feasibility of the cable. This paper describes the experimental results for over-current pulses of a 1-m single-layer cable fabricated with five copper-laminated YBCO tapes and a copper former. Further, we performed numerical simulations by using a newly developed computer program based on the 3D finite element method.

    DOI: 10.1109/TASC.2008.920610

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  • 球体バルク超電導体を用いたアクティブ磁気浮上の位置制御

    菅兼治, 植田浩史, 我妻洸, 石山敦士

    電気学会超電導応用電力機器研究会資料   97 ( 16-35.37-38 )   2008年

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  • Fatigue tests of YBCO coated conductors

    S. Bamba, Y. Tanaka, T. Ando, H. Ueda, A. Ishiyama, Y. Yamada, Y. Shiohara

    8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'07)   97   2008年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    In this paper, we report the fatigue characteristics of IBAD/PLD YBCO coated conductors. A YBCO coated conductor used in the superconducting coil of a SMES system is repeatedly subjected to mechanical tensile or compressive strain due to the Lorentz force during electrical charging or discharging. The superconducting characteristic of this conductor may deteriorate because of this cyclic strain. Therefore, it is necessary to investigate the effect of cyclic strain on the superconducting characteristics of YBCO coated conductors that have a laminated structure. We developed an experimental apparatus with a U-shaped sample holder in order to apply cyclic strain to the sample tape. This apparatus was used to perform the fatigue tests on YBCO coated conductors in liquid nitrogen in the absence of an external magnetic field. The strain cycles with the maximum strain epsilon(max) (zero external strain -&gt; epsilon(max) -&gt; zero external strain) were applied and repeated up to 5000 times, and the I-c measurements were performed at epsilon(max). Therefore, the application of cyclic strain with emax ranging from 0.3% to 0.5% did not result in any significant deterioration of the superconducting characteristics of the conductor.

    DOI: 10.1088/1742-6596/97/1/012170

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  • 蛍光剤を用いた2次元温度分布可視化システムによるYBCO超電導線材の常電導転移・伝播の可視化

    石山敦士, 土屋元計, 植田浩史, 加藤英幸, 奈良広一, 塩原融

    電気学会超電導応用電力機器研究会資料   97 ( 18-34 )   2008年

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  • Visualization of Normal-zone initiation and Propagation using Fluorescent Paints

    A. Ishiyama, H. Murakami, M. Tsuchiya, H. Ueda, H. Kato, K. Nara, Y. Shiohara

    8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'07)   97   12169   2008年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    To establish a stability criterion for Yttrium barium copper oxide (YBCO)-coated conductors, it is necessary to clarify their transient thermal characteristics. Thermocouple thermometers, resistance thermometers, or the relation between the temperature and resistance of the stabilizer used for the conductors are generally employed for measuring their temperatures. However, these methods can only be employed to observe fixed-point data. Hence, it is difficult to observe the longitudinal and transversal distributions of temperatures in coated conductors. In this study, we adopt a method for the visualization of the temperature distribution of coated conductors by using fluorescent paints whose color changes with temperature. By adopting this method, we can measure the two-dimensional distribution of temperature in magnetic fields and at cryogenic temperatures. Therefore, local heat generation in the YBCO tapes can be observed with a higher spatial resolution and the uniformity in the critical current density of YBCO tapes can be identified. In this paper, we describe the developed thermal visualization system and the preliminary experimental results of the visualization of normal-zone initiation and propagation in YBCO sample strips. Further, we also report a part of the normal-zone initiation and propagation mechanism by electromagnetic field and heat transfer analyses by employing a three-dimensional finite element method (FEM).

    DOI: 10.1088/1742-6596/97/1/012169

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  • Degradation of YBCO Coated Conductors Caused by Over-current Pulses

    X. Wang, H. Ueda, A. Ishiyama, Y. Iijima, T. Saitoh, N. Kashima, M. Mori, T. Watanabe, S. Nagaya, T. Katoh, T. Machi, Y. Shiohara

    8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'07)   97   2008年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    YBCO tapes are expected to be used in future high temperature superconductor (HTS) applications because they have excellent J(c) characteristics at high temperatures and in high magnetic fields. For application to electric power devices such as transmission cables, transformers, and fault current limiters, the YBCO tapes might be subjected to a short-circuit fault current that is 10-30 times the normal operating current. In a worst-case scenario, YBCO tapes may degrade and burn. Therefore, it is important to clarify the mechanism of the degradation caused by an over-current pulse. This paper describes the experimental results of the degradation of the YBCO tapes through a series of over-current pulse tests. We focussed on the degradation temperature and carried out the experiments with different bending strains. Measurements were performed as a function of the amplitude of an over-current pulse for an operating temperature of 80 K (Gifford-McMahon cryocooler was adopted) in a self-field. We also examined a tape after the experiments with magneto-optical (MO) imaging, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron diffraction patterns.

    DOI: 10.1088/1742-6596/97/1/012150

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  • Degradation of YBCO Coated Conductors Caused by Over-current Pulses

    X. Wang, H. Ueda, A. Ishiyama, Y. Iijima, T. Saitoh, N. Kashima, M. Mori, T. Watanabe, S. Nagaya, T. Katoh, T. Machi, Y. Shiohara

    8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'07)   97   12150   2008年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    YBCO tapes are expected to be used in future high temperature superconductor (HTS) applications because they have excellent J(c) characteristics at high temperatures and in high magnetic fields. For application to electric power devices such as transmission cables, transformers, and fault current limiters, the YBCO tapes might be subjected to a short-circuit fault current that is 10-30 times the normal operating current. In a worst-case scenario, YBCO tapes may degrade and burn. Therefore, it is important to clarify the mechanism of the degradation caused by an over-current pulse. This paper describes the experimental results of the degradation of the YBCO tapes through a series of over-current pulse tests. We focussed on the degradation temperature and carried out the experiments with different bending strains. Measurements were performed as a function of the amplitude of an over-current pulse for an operating temperature of 80 K (Gifford-McMahon cryocooler was adopted) in a self-field. We also examined a tape after the experiments with magneto-optical (MO) imaging, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron diffraction patterns.

    DOI: 10.1088/1742-6596/97/1/012150

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  • CIC導体内におけるNb<sub>3</sub>Sn素線の超電導特性の数値解析・評価

    村上陽之, 植田浩史, 石山敦士, 小泉徳潔, 奥野清

    電気学会超電導応用電力機器研究会資料   18 ( 2 )   1051 - 1054   2008年

  • YBCO超電導ケーブル導体の過電流通電特性解析

    石山敦士, WANG Xudong, 西尾幸恭, 植田浩史, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    電気学会超電導応用電力機器研究会資料   468 ( 15-20 )   2041 - 2045   2008年

  • Fatigue tests of YBCO coated conductors

    S. Bamba, Y. Tanaka, T. Ando, H. Ueda, A. Ishiyama, Y. Yamada, Y. Shiohara

    8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'07)   97   12170   2008年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    In this paper, we report the fatigue characteristics of IBAD/PLD YBCO coated conductors. A YBCO coated conductor used in the superconducting coil of a SMES system is repeatedly subjected to mechanical tensile or compressive strain due to the Lorentz force during electrical charging or discharging. The superconducting characteristic of this conductor may deteriorate because of this cyclic strain. Therefore, it is necessary to investigate the effect of cyclic strain on the superconducting characteristics of YBCO coated conductors that have a laminated structure. We developed an experimental apparatus with a U-shaped sample holder in order to apply cyclic strain to the sample tape. This apparatus was used to perform the fatigue tests on YBCO coated conductors in liquid nitrogen in the absence of an external magnetic field. The strain cycles with the maximum strain epsilon(max) (zero external strain -&gt; epsilon(max) -&gt; zero external strain) were applied and repeated up to 5000 times, and the I-c measurements were performed at epsilon(max). Therefore, the application of cyclic strain with emax ranging from 0.3% to 0.5% did not result in any significant deterioration of the superconducting characteristics of the conductor.

    DOI: 10.1088/1742-6596/97/1/012170

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  • 単層1m級YBCO超電導ケーブル導体の過電流通電特性-実験および数値解析-

    植田浩史, 西尾幸恭, WANG Xudong, 石山敦士, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    電気学会超電導応用電力機器研究会資料   97 ( 45-51 )   2008年

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  • Overcurrent Characteristics of 1 m Long Superconducting Model Cable using YBCO Coated Conductors

    H. Ueda, X. Wang, A. Ishiyama, S. Mukoyama, M. Yagi, N. Kashima, S. Nagaya, Y. Shiohara

    8TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'07)   97   12168   2008年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    In applications to power transmission cables, a number of YBCO tapes would be assembled and wound spirally on a Cu former. The YBCO tapes and the Cu former would be connected in parallel and could be subjected to short-circuit fault currents 10 to 30 times the operating current. The fault currents would drive the YBCO tapes into the normal state and thus generate Joule heating for the duration of the fault. Therefore, in order to examine the stability and feasibility of YBCO power transmission cables, it is important to demonstrate the redistribution of the transport current and the electromagnetic coupling between the YBCO tapes and the Cu former during a short-circuit fault current. We constructed a 1 m long superconducting model cable and subjected it to an overcurrent with a peak of 31.5 kA(rms) for a duration of 2.0 s, as established by JEC (Japanese Electrotechnical Committee), in a liquid nitrogen bath. We examined the redistribution of the transport current between the YBCO sample tapes and the Cu former by using Hall probes. In addition, we developed a novel computer code based on the finite element method and an equivalent circuit in order to clarify the characteristics of the redistribution of the transport current and the thermal behaviour within the cable. Finally, we designed a 10 m long cable that would reach the degradation temperature of the YBCO tape due to the fault currents.

    DOI: 10.1088/1742-6596/97/1/012168

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  • 医薬用たんぱく質の高勾配磁気分離システムによる高速分離・精製・回収用フィルターの設計

    我妻洸, 淵野修一郎, 古瀬充穂, 植田浩史, 石山敦士, 柁川一弘

    低温工学・超電導学会講演概要集   78th   2008年

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  • 医薬用たんぱく質の高勾配磁気分離システムによる高速分離・精製・回収用フィルターの設計

    植田浩史, 石山敦士, 我妻洸, 淵野修一郎, 古瀬充穂, 柁川一弘

    低温工学・超電導学会講演概要集   79th   2008年

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  • 医薬用たんぱく質の高速分離・精製・回収用高勾配磁気分離システム

    我妻洸, 淵野修一郎, 古瀬充穂, 柁川一弘, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   79th   2008年

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  • 10m級YBCO超電導ケーブルの過電流通電試験と解析

    佐藤俊祐, WANG Xudong, 植田浩史, 石山敦士, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    低温工学・超電導学会講演概要集   79th   2008年

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  • YBCO超電導線材のひずみおよび疲労特性評価

    石山敦士, 田中洋輔, 川井優季, 佐藤俊祐, 植田浩史, 塩原融, 山田穣, 飯島康裕, 斉藤隆, 鹿島直二, 長屋重夫

    電気学会超電導応用電力機器研究会資料   ASC-08 ( 19-26.28-31 )   2008年

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  • YBCO超電導線材の過電流パルス通電による特性劣化試験

    河野秀太郎, WANG Xudong, 西尾幸恭, 佐藤俊祐, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 八木正史, 向山晋一, 加藤英幸, 塩原融

    低温工学・超電導学会講演概要集   79th   2008年

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  • 10m級YBCO超電導ケーブルの過電流通電特性

    WANG Xudong, 植田浩史, 石山敦士, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    低温工学・超電導学会講演概要集   78th   2008年

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  • 高温超電導線材の放射化実験

    植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 宮原信幸

    低温工学・超電導学会講演概要集   78th   2008年

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  • YBCO超電導線材の過電流パルス通電による特性劣化試験

    佐藤俊祐, 河野秀太郎, WANG Xudong, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 八木正史, 向山晋一, 飯島康裕, 斉藤隆, 塩原融

    低温工学・超電導学会講演概要集   78th   2008年

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  • 球状バルク超電導体のアクティブ磁気浮上における安定性評価

    陸旭棟, 青木徹, 石垣善弘, 植田浩史, 我妻洸, 石山敦士, 岩本晃史, 柳長門, 三戸利行

    低温工学・超電導学会講演概要集   78th   2008年

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  • YBCO超電導線材の過電流パルス通電による特性劣化と層間剥離

    河野秀太郎, WANG Xudong, 西尾幸恭, 植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 八木正史, 向山晋一, 加藤英幸, 塩原融

    低温工学・超電導学会講演概要集   78th   2008年

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  • YBCO超電導線材の疲労特性

    川井優季, 田中洋輔, 植田浩史, 石山敦士, 飯島康裕, 斉藤隆, 鹿島直二, 長屋重夫, 山田穣, 塩原融

    低温工学・超電導学会講演概要集   79th   2008年

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  • 球状バルク超電導体のアクティブ磁気浮上における安定性評価

    陸旭棟, 青木徹, 石垣善弘, 植田浩史, 我妻洸, 石山敦士, 岩本晃史, 柳長門, 三戸利行

    低温工学・超電導学会講演概要集   79th   2008年

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  • 高温超電導線材の放射化特性

    植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 宮原信幸

    低温工学・超電導学会講演概要集   79th   2008年

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  • YBCO超電導ケーブルの通電・伝熱特性評価用計算機シミュレータの開発

    WANG Xudong, 佐藤俊祐, 植田浩史, 石山敦士, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    低温工学・超電導学会講演概要集   79th   2008年

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  • 球状バルク超電導体のアクティブ磁気浮上の安定・位置制御

    陸旭棟, 菅兼治, 植田浩史, 我妻洸, 石山敦士

    電気学会全国大会講演論文集   2008 ( 5 )   2008年

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  • コイル保護に基づくYBCO線材の安定化層厚の決定-SMES用コイルを想定して-

    川井優季, 植田浩史, 石山敦士

    電気学会全国大会講演論文集   2008 ( 5 )   2008年

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  • 球体バルク超電導体を用いたアクティブ磁気浮上の浮上安定性

    石垣善弘, 陸旭棟, 植田浩史, 我妻洸, 石山敦士

    電気学会超電導応用電力機器研究会資料   ASC-08 ( 19-26.28-31 )   2008年

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  • YBCO超電導線材の過電流パルス通電による特性劣化-YBCO層の厚みの影響-

    河野秀太郎, WANG Xudong, 西尾幸恭, 伊豫田章悟, 植田浩史, 石山敦士, 飯島康裕, 斎藤隆, 塩原融

    電気学会全国大会講演論文集   2008 ( 5 )   2008年

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  • YBCO超電導ケーブル導体の過電流特性解析

    佐藤俊祐, WANG Xudong, 西尾幸恭, 植田浩史, 石山敦士, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    電気学会全国大会講演論文集   2008 ( 5 )   2008年

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  • 10m級YBCO超電導ケーブルの過電流通電特性-実験と解析-

    WANG Xudong, 植田浩史, 石山敦士, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    電気学会超電導応用電力機器研究会資料   ASC-08 ( 19-26.28-31 )   2008年

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  • 高温超電導線材の放射化実験

    植田浩史, 石山敦士, 鹿島直二, 長屋重夫, 宮原信幸

    電気学会超電導応用電力機器研究会資料   ASC-08 ( 19-26.28-31 )   2008年

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  • YBCO超電導線材の疲労特性

    川井優季, 田中洋輔, 植田浩史, 石山敦士, 飯島康裕, 斉藤隆, 鹿島直二, 長屋重夫, 山田穣, 塩原融

    低温工学・超電導学会講演概要集   78th   2008年

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  • Development of pipeline transporter system using pinning effect of high-temperature superconducting bulks

    Hiroshi Ueda, Motokazu Tsuchiya, Atsushi Ishiyama

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   17 ( 2 )   2323 - 2326   2007年6月

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have been developing a pipeline transporter system using high-temperature superconducting bulks (HTS bulks). In this paper, we propose a pipeline transporter system using pinning effect of HTS bulks. This system has the advantage of the application in harsh or dangerous environment such as in hazardous gas. This system requires large lateral force at the certain gap between the permanent magnets and the HTS bulks. For the realization of this pipeline transporter system, we investigated the influences of the arrangement of HTS bulks and permanent magnets on the lateral force characteristics through experiments and numerical simulations by using a computer program based on the three-dimensional hybrid finite element and boundary element (3D hybrid FE-BE) method. And we also designed a model system with a lateral force of 1500 N.

    DOI: 10.1109/TASC.2007.899966

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  • 超電導送電ケーブルを想定した並列接続YBCO超電導線材の過渡的安定性評価

    石山敦士, 岩田拓也, WANG Xudong, 植田浩史, 向山晋一, 塩原融

    電気学会超電導応用電力機器研究会資料   17 ( 2 )   1672 - 1675   2007年6月

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  • Assessment of cryogenic thermography system using commercial fluorescent paints on their applicability to visualization of normal-zone propagation in YBCO coated conductor

    Atsushi Ishiyama, Motokazu Tsuchiya, Hiroshi Ueda, Yuh Shiohara

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   17 ( 2 )   3765 - 3768   2007年6月

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    To establish a stability criterion for YBCO coated conductors, it is required to clarify their transient thermal characteristics. In this study, we adopt a method for visualization of. temperature distribution using fluorescent paints whose color changes depending on the temperature. In the visualization method, firstly, commercial fluorescent paints are coated on the surface of sample strips. And then, the sample is irradiated by a black light or UV-LEDs, and the image of the fluorescence is observed by a CCD camera. These captured images are manipulated image processing by a computer, and show the temperature distribution. This system can be applied to cryogenic and high magnetic field circumstances. By adopting this visualization method to the investigation of transient thermal characteristics of YBCO tapes, local heat generation in the YBCO tapes can be observed by higher resolution, and it is expected to identify the uniformity of critical current density of YBCO tapes. In this paper, we describe the developed thermal visualization system and the preliminary experimental results on visualization of normal-zone initiation and propagation in YBCO sample strip fabricated with IBAD/PLD method.

    DOI: 10.1109/TASC.2007.899124

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  • Numerical Simulation of Critical Performance of Nb3Sn strand Subjected to Periodic Bending Strain

    H. Murakami, H. Ueda, K. Agatsuma, A. Ishiyama, N. Koizumi, K. Okuno

    International Conference on Magnet Technology   2007年

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  • YBCO超電導線材の過電流パルス通電による特性劣化

    石山敦士, 田中康武, WANG Xudong, 植田浩史, 飯島康裕, 斎藤隆, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 加藤丈晴, 町敬人, 塩原融

    電気学会超電導応用電力機器研究会資料   17 ( 2 )   3509 - 3512   2007年

  • Numerical simulation of critical current and n-value in Nb<inf>3</inf>Sn strand subjected to bending strain

    Murakami, H., Ishiyama, A., Ueda, H., Koizumi, N., Okuno, K.

    IEEE Transactions on Applied Superconductivity   17 ( 2 )   1394 - 1397   2007年

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Critical current of ITER model coil degraded with the increase of electromagnetic force. Analysis based on results of the experiments in which periodic transverse load is artificially applied to single strand showed that periodic bending of the strand by transverse load caused this degradation. However, since the experiments were carried out under a certain condition, general relation between transverse load and critical current was not obtained. We have therefore developed a numerical simulation code to investigate the general relation. However, there were some disagreements between the simulation and experimental results in our previous study. Our simulation model was consequently modified, resulting in good agreement with the test results. The general dependence of the critical current on periodic transverse load, temperature, and pitch of periodic load is investigated using the modified simulation code. The simulation results reveal that the reduced critical current depends on the temperature, and is a function of the bending strain independent of the pitch of the periodic load.

    DOI: 10.1109/TASC.2007.898113

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  • 高速多重極法を用いたバルク超電導体を含む3次元電磁界解析

    植田浩史, 東谷智史, 土屋賢史, 土屋元計, 石山敦士

    電気学会超電導応用電力機器研究会資料   ASC-05 ( 37-43 )   2007年

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  • A criterion for determining stabilizer thickness of YBCO coated conductors based on coil protection

    Ishiyama, A., Ueda, H., Ando, T., Naka, H., Bamba, S., Shiohara, Y.

    IEEE Transactions on Applied Superconductivity   17 ( 2 )   2430 - 2433   2007年

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    The purpose of this study is to propose a criterion for determining stabilizer thickness of YBCO coated conductors. The permissible disturbance energy density in high-temperature superconductors (HTSs) is two or three orders of magnitude greater than that in low-temperature superconductors (LTSs). On the other hand, to enhance the reliability and safety of HTS coils, an establishment of a protection scheme assuming a quench caused by a failure in power supply, cooling system or similar problem is also required for HTS coil systems. Quenching produces excessive temperature or voltage in the coil winding; overheating may cause the conductor to meltdown, or high voltage may punch a hole in the winding. To avoid these types of damages in YBCO coils, a suitable stabilizer thickness must be determined for the sophisticated structure of YBCO coated conductors, which are composed of highly textured thin-film on a flat flexible substrate. Therefore, we investigate the appropriate structure for YBCO coated conductors from the perspective of energy dumping (i.e., quench protection). Based on the protection scheme that the stored magnetic energy in the coils is dumped by an external dump resistance prepared as a quench protection, we derive a function that examines the heat balance of a quenching YBCO coil in an adiabatic condition and propose a criterion using the function to determine an appropriate stabilizer thickness for YBCO coated conductors.

    DOI: 10.1109/TASC.2007.897998

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  • 医療用抗体たんぱく質(免疫グロブリン)分離・精製用高勾配磁気分離システム その2・フィルターの検討

    植田浩史, 柁川一弘, 我妻洸, 淵野修一郎, 古瀬充穂, 小泉達雄

    低温工学・超電導学会講演概要集   77th   2007年

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  • 医療用抗体たんぱく質(免疫グロブリン)分離・精製用高勾配磁気分離システム その1・基礎実験

    我妻洸, 淵野修一郎, 古瀬充穂, 植田浩史, 柁川一弘, 小泉達雄

    低温工学・超電導学会講演概要集   77th   2007年

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  • 球状バルク超電導体のアクティブ磁気浮上における安定・位置制御

    菅兼治, 陸旭棟, 植田浩史, 我妻洸, 石山敦士

    低温工学・超電導学会講演概要集   77th   2007年

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  • 数値シミュレーションによるNb<sub>3</sub>Sn素線の曲げ歪印加時における超電導特性の評価

    村上陽之, 植田浩史, 石山敦士, 小泉徳潔, 奥野清

    低温工学・超電導学会講演概要集   76th   2007年

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  • YBCO超電導線材の過電流パルス通電による特性劣化の評価

    西尾幸恭, WANG Xudong, 植田浩史, 河野秀太郎, 伊豫田章悟, 石山敦士, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 飯島康裕, 斎藤隆, 八木正史, 向山晋一, 山田穣, 町敬人, 塩原融

    低温工学・超電導学会講演概要集   77th   2007年

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  • YBCO超電導線材の過電流パルス通電による特性劣化-曲げ歪の影響-

    石山敦士, WANG Xudong, 田中康武, 植田浩史, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 町敬人, 塩原融

    電気学会全国大会講演論文集   2007 ( 5 )   2007年

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  • YBCO超電導線材のひずみ特性および疲労特性

    田中洋輔, 番場貞徳, 植田浩史, 石山敦士, 飯島康裕, 斉藤隆, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 山田穣, 塩原融

    低温工学・超電導学会講演概要集   77th   2007年

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  • Ic分布を考慮したYBCO超電導線材の常電導転移・伝播特性

    WANG Xudong, 土屋元計, 植田浩史, 石山敦士, 塩原融

    低温工学・超電導学会講演概要集   76th   2007年

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  • 数値シミュレーションによるNb<sub>3</sub>Sn素線の曲げ歪印加時における超電導特性の評価

    村上陽之, 植田浩史, 我妻洸, 石山敦士, 小泉徳潔, 奥野清

    電気学会超電導応用電力機器研究会資料   ASC-07 ( 18-34 )   2007年

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  • 冷凍機伝導冷却YBCO超電導コイルの熱的特性評価実験・解析

    石山敦士, 安東武利, 番場貞徳, 植田浩史, 富士広, 飯島康裕, 斉藤隆, 塩原融

    電気学会超電導応用電力機器研究会資料   ASC-07 ( 18-34 )   2007年

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  • YBCO線材の繰り返しひずみ特性

    田中洋輔, 安東武利, 番場貞徳, 植田浩史, 石山敦士, 山田穣, 塩原融

    電気学会全国大会講演論文集   2007 ( 5 )   2007年

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  • 超電導送電ケーブルを想定した並列接続YBCO超電導線材の過渡的安定性評価

    石山敦士, 西尾幸恭, WANG Xudong, 岩田拓也, 植田浩史, 向山晋一, 塩原融

    電気学会全国大会講演論文集   2007 ( 5 )   2007年

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  • 数値シミュレーションによるNb<sub>3</sub>Sn素線の曲げ歪印加時における超電導特性の評価

    村上陽之, 植田浩史, 我妻洸, 石山敦士, 小泉徳潔, 奥野清

    電気学会全国大会講演論文集   2007 ( 5 )   2007年

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  • YBCO超電導線材の過電流パルス通電による特性劣化-曲げひずみの影響-

    田中洋輔, WANG Xudong, 植田浩史, 石山敦士, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 町敬人, 塩原融

    低温工学・超電導学会講演概要集   76th   2007年

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  • 単層1m級YBCO超電導ケーブルの過電流通電特性評価(1.実験)

    石山敦士, 西尾幸恭, WANG Xudong, 岩田拓也, 植田浩史, 八木正史, 向山晋一, 塩原融

    低温工学・超電導学会講演概要集   76th   2007年

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  • YBCO超電導ケーブル導体の過電流特性解析

    石山敦士, WANG Xudong, 西尾幸恭, 植田浩史, 八木正史, 向山晋一, 鹿島直二, 長屋重夫, 塩原融

    低温工学・超電導学会講演概要集   77th   2007年

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  • CIC導体内におけるNb<sub>3</sub>Sn素線の超電導特性の数値解析・評価

    村上陽之, 植田浩史, 石山敦士, 小泉徳潔, 奥野清

    低温工学・超電導学会講演概要集   77th   2007年

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  • 単層1m級YBCO超電導ケーブル導体の過電流通電特性(2.解析)

    植田浩史, 西尾幸恭, 岩田拓也, WANG Xudong, 石山敦士, 八木正史, 向山晋一, 塩原融

    低温工学・超電導学会講演概要集   76th   2007年

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  • コイル保護に基づくYBCO線材の安定化層厚の決定-SMES用コイルを想定して

    番場貞徳, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   77th   2007年

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  • Numerical simulation of the critical current and n-value in Nb3Sn strand subjected to bending strain

    Masayuki Hirohashi, Haruyuki Murakami, Atsushi Ishiyama, Hiroshi Ueda, Norikiyo Koizumi, Kiyoshi Okuno

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   16 ( 2 )   1721 - 1724   2006年6月

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    To demonstrate the applicability of Nb3Sn Cable in Conduit Conductors (CICC's) to International Thermonuclear Experimental Reactor (ITER) coils, four Nb3Sn model coils have been constructed and tested. The experimental results showed that the measured critical current of the conductors degraded compared with what is expected from the ability of the strands. In addition, the larger is the applied electromagnetic force, the larger the magnitude of the degradation is. A degradation in n-value was also observed. One of the explanations of this degradation is supposed to be a local strand bending. This consideration has been supported by test results, in which a similar degradation in the critical current and n-value was observed when applying periodic bending strains to a single strand. However, general dependence of critical current on periodic bending strain has not been clarified in this test since the experiments were carried out at a certain magnetic field, temperature and strain. Therefore, a numerical simulation code was developed to study the general dependence of the critical current and n-value of Nb3Sn strand on periodic bending strain. A distributed constant circuit model is applied to simulate current transfer among the filaments in the strand. The simulation results show relatively good agreement with the experimental results but some modification in modeling is required for more accurate simulation.

    DOI: 10.1109/TASC.2006.871310

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  • Operational Characteristics of Linear Synchronous Actuator with Field-Cooled YBCO Bulk Secondary

    T. Shibata, H. Ueda, K. Agatsuma, A. Ishiyama

    7TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'05)   43   975 - 978   2006年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    It is expected that electric devices would be high efficiency, high output and downsized by using high-temperature superconducting (HTS) bulk materials. In the previous study, we have fabricated and tested a linear synchronous actuator with double-sided primary and YBCO bulk secondary; the linear actuator consists of a field-cooled YBCO bulk for secondary (mover) and copper windings with an iron core as a primary. The primary, which was excited by a three-phase VVVF (variable voltage variable frequency) power source to generate sinusoidal traveling magnetic fields, was divided into two sections: 1) the starting section in which the secondary is accelerated as an induction machine; and 2) the synchronous section in which the secondary moves with a specified synchronous speed. And we have evaluated both of the static and dynamic characteristics on this linear synchronous actuator. However, for practical use of linear actuator with field-cooled HTS bulk secondary, it is required to examine the distribution of magnetic field within the HTS bulk which is exposed to the traveling magnetic field in a realistic operational environment of linear actuator. Therefore, in this study, we repeated the mode of acceleration, constant-speed, deceleration and stop with the control circuit in the synchronous section. The direction of the mover can be turned automatically by the switching device and it made round-trip running possible. Then, we carried out many times round-trip operations and evaluated the change of the magnetic field on the surface of the YBCO bulk in various conditions with trapped field of the secondary and traveling magnetic field generated by the primary windings.

    DOI: 10.1088/1742-6596/43/1/238

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  • A Stability Criterion for design of YBCO Coated Conductors and Coils based on Quench Protection

    A. Ishiyama, H. Ueda, T. Ando, H. Naka, S. Banba, Y. Shiohara

    Applied Superconductivity Conference 2006   2006年

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  • Position Control of Active Magnetic Levitation using YBCO Bulk and Multiple Electromagnets

    Y. Ito, H. Ueda, K. Agatsuma, A. Ishiyama

    7TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS'05)   43   987 - 990   2006年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    We have been developing an active magnetic levitation system composed of field-cooled disk-shaped YBCO bulk and multiple ring-shaped electromagnets which are vertically piled up. We have demonstrated and reported that the levitation height, as well as stability, can be remarkably improved by adjusting the operating current of each electromagnet individually. In this study, we constructed a noncontact position control system in the vertical direction based on the feedback control theory and the electromagnetic field analyses considering superconducting characteristics of the YBCO bulk. Depending on levitation height, the operating current in the electromagnets is controlled automatically. The system consists of two ring-shaped copper-winding electromagnets without iron core and a ring-shaped YBCO bulk magnetized by the field-cooling process. We carried out experiments to verify the feasibility of noncontact position control system. In the experiment for position control, the levitation height maintained a target position accurately, and responded smoothly to changing target position. In addition, we aimed at the construction of the position control system with higher accuracy using the numerical simulation based on the finite element method analyses. And, the position control system that piled up three electromagnets was designed and constructed. Concretely, accuracies of the position control within 28 mu m were obtained. Final goal of our study is to apply the levitation system to the inertial nuclear fusion in which the accuracy as high as several mu m would be required.

    DOI: 10.1088/1742-6596/43/1/241

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  • 3D electromagnetic analysis of levitating transporter using bulk superconductor

    Ueda, H., Azumaya, S., Tsuchiya, S., Ishiyama, A.

    IEEE Transactions on Applied Superconductivity   16 ( 2 )   1092 - 1095   2006年

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have constructed and demonstrated levitating transporter models composed of the superconductor bulks (HTS bulks) and permanent magnets. The dynamic characteristics of lift force, lateral force and magnetic stiffness are very important for the design of superconducting devices such as a levitation system. The electromagnetic phenomenon should be clarified through the accurate analyses of the magnetic field and shielding current distributions within HTS bulks. In this study, we developed a new simulation program based on the three-dimensional hybrid finite element and boundary element (3D hybrid FE-BE) method, which combines with the fast multipole method (FMM). By using the FMM, it is possible to solve the large-scale problem with a reduction of the required memory size and improvement of the accuracy. This simulation program can consider the anisotropic and nonlinear E - J characteristics of HTS bulks. The results of experiment and numerical simulation are in good agreement.

    DOI: 10.1109/TASC.2006.871280

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  • YBCO超電導線材を用いた超電導ケーブル導体の過電流特性解析

    植田浩史, 岩田拓也, WANG Xudong, 石山敦士, 向山晋一, 塩原融

    低温工学・超電導学会講演概要集   75th   2006年

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  • Nb<sub>3</sub>Sn素線の曲げ歪印加時における超電導特性の数値解析・評価

    村上陽之, 植田浩史, 我妻洸, 石山敦士, 小泉徳潔, 奥野清

    電気学会超電導応用電力機器研究会資料   ASC-06 ( 16-35.37-38 )   2006年

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  • バルク超電導体のピン止め力を用いたパイプライン搬送装置の基礎特性実験

    石垣善弘, 植田浩史, 我妻洸, 石山敦士

    電気学会超電導応用電力機器研究会資料   ASC-06 ( 16-35.37-38 )   2006年

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  • 着磁したバルク超電導体を二次側走行子とするリニア同期アクチュエータの特性評価

    菅兼治, 植田浩史, 石山敦士

    電気学会全国大会講演論文集   2006 ( 5 )   2006年

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  • 高温超電導コイルのクエンチ保護に関する一考察

    番場貞徳, 鈴木公三, 中里しょう平, 安東武利, 植田浩史, 石山敦士, 塩原融

    電気学会全国大会講演論文集   2006 ( 5 )   2006年

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  • YBCO線材の過電流パルス通電による特性劣化について

    石山敦士, WANG Xudong, 植田浩史, 飯島康裕, 斎藤隆, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 町敬人, 塩原融

    電気学会超電導応用電力機器研究会資料   ASC-06 ( 16-35.37-38 )   2006年

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  • YBCO線材の過電流パルス通電時の特性劣化について

    WANG Xudong, 鈴木公三, 中里しょう平, 植田浩史, 石山敦士, 飯島康裕, 斎藤隆, 塩原融

    電気学会全国大会講演論文集   2006 ( 5 )   2006年

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  • コイル保護に基づくYBCO線材の安定化層厚の決定法

    石山敦士, 番場貞徳, 安東武利, 植田浩史, 我妻洸, 塩原融

    電気学会超電導応用電力機器研究会資料   ASC-06 ( 16-35.37-38 )   2006年

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  • YBCO線材の繰り返しひずみ特性

    番場貞徳, 安東武利, 植田浩史, 我妻洸, 石山敦士, 飯島康裕, 斎藤隆

    低温工学・超電導学会講演概要集   75th   2006年

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  • 数値シミュレーションによるNb<sub>3</sub>Sn素線の曲げ歪印加時における超電導特性の評価

    村上陽之, 植田浩史, 石山敦士, 小泉徳潔, 奥野清

    低温工学・超電導学会講演概要集   75th   2006年

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  • Nb<sub>3</sub>Sn素線の曲げ歪印加時における超電導特性の数値解析・評価

    村上陽之, 植田浩史, 石山敦士, 小泉徳潔, 奥野清

    低温工学・超電導学会講演概要集   74th   2006年

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  • 超電導送電ケーブルを想定した並列接続YBCO超電導線材の過渡的安定性評価(1.実験)

    石山敦士, WANG Xudong, 岩田拓也, 植田浩史, 向山晋一, 塩原融

    低温工学・超電導学会講演概要集   75th   2006年

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  • 着磁したバルク超電導体を二次側走行子に適用したリニア同期アクチュエータの特性評価

    菅兼治, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   74th   2006年

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  • 冷凍機伝導冷却YBCO超電導コイルの熱特性評価解析

    石山敦士, 安東武利, 番場貞徳, 植田浩史, 富士広, 斉藤隆, 塩原融

    低温工学・超電導学会講演概要集   75th   2006年

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  • バルク超電導体のピン止め力を用いたパイプライン搬送装置の基礎特性実験

    石垣善弘, 土屋元計, 土屋賢史, 東谷智史, 植田浩史, 石山敦士

    電気学会全国大会講演論文集   2006 ( 5 )   2006年

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  • YBCO線材の過電流パルス通電による特性劣化について(1)-安定化層の厚みの影響-

    WANG Xudong, 番場貞徳, 植田浩史, 石山敦士, 飯島康裕, 斎藤隆, 塩原融

    低温工学・超電導学会講演概要集   74th   2006年

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  • 超電導送電ケーブルを想定した並列接続YBCO超電導線材の過渡的安定性評価(2.シミュレーション)

    石山敦士, 岩田拓也, WANG Xudong, 植田浩史, 向山晋一, 塩原融

    低温工学・超電導学会講演概要集   75th   2006年

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  • 蛍光剤を用いた2次元温度分布観測システムによるYBCO線材の常電導転移・伝播の可視化

    石山敦士, 土屋元計, 植田浩史, 加藤英幸, 奈良広一, 塩原融

    低温工学・超電導学会講演概要集   75th   2006年

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  • 球状バルク超電導体を用いたアクティブ磁気浮上の位置制御(実験)

    菅兼治, 石垣善弘, 植田浩史, 我妻洸, 石山敦士

    低温工学・超電導学会講演概要集   75th   2006年

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  • コイル保護に基づくYBCO線材の安定化層厚の決定法(1)-決定法の提案-

    石山敦士, 安東武利, 植田浩史, 塩原融

    低温工学・超電導学会講演概要集   74th   2006年

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  • YBCO超電導線材の過電流パルス通電による特性劣化

    田中康武, WANG Xudong, 植田浩史, 石山敦士, 飯島康裕, 斉藤隆, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 加藤丈晴, 町敬人, 塩原融

    低温工学・超電導学会講演概要集   75th   2006年

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  • バルク超電導体のピン止め力を用いたパイプライン搬送装置の基礎特性実験

    石垣善弘, 土屋元計, 植田浩史, 我妻洸, 石山敦士

    低温工学・超電導学会講演概要集   74th   2006年

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  • コイル保護に基づくYBCO線材の安定化層厚の決定法(2)-適用例-

    石山敦士, 安東武利, 植田浩史, 塩原融

    低温工学・超電導学会講演概要集   74th   2006年

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  • YBCO線材の過電流パルス通電による特性劣化について(2)-線材の長さ・運転温度の影響-

    番場貞徳, WANG Xudong, 植田浩史, 石山敦士, 飯島康裕, 斎藤隆, 鹿島直二, 森匡見, 渡部智則, 長屋重夫, 町敬人, 塩原融

    低温工学・超電導学会講演概要集   74th   2006年

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  • 球状バルク超電導体を用いたアクティブ磁気浮上の位置制御(シミュレーション)

    石垣善弘, 菅兼治, 植田浩史, 我妻洸, 石山敦士

    低温工学・超電導学会講演概要集   75th   2006年

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  • 球状バルク超電導体を用いたアクティブ磁気浮上の位置制御

    植田浩史, 菅兼治, 我妻洸, 石山敦士

    低温工学・超電導学会講演概要集   74th   2006年

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  • YBCO線材の常電導転移・伝播特性評価

    石山敦士, 曽我部義高, 柳井正浩, 植田浩史, 塩原融

    電気学会超電導応用電力機器研究会資料   15 ( 2 PART II )   1659 - 1662   2005年

  • Lift and restoring force characteristics evaluation of levitating X-Y transporter using HTS bulks

    Kudou, Y., Ueda, H., Ishiyama, A.

    IEEE Transactions on Applied Superconductivity   15 ( 2 PART II )   2230 - 2233   2005年

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have been developing an X-Y (two-dimensional) magnetic levitating transporter, which is composed of the HTS bulks and permanent magnets. To accomplish the design of a real levitation system, we have to investigate the influence of permanent magnet arrangement on levitating characteristics. In this study, we prepared several types of permanent magnets and evaluated how magnetic flux distribution influences the levitating characteristics through lift and restoring force measurements and numerical simulation. For the simulation, we developed a computer program based on the 3D hybrid finite and boundary element (FE-BE) methods, taking into account the anisotropic and nonlinear I - V characteristics of HTS bulks. The simulation results agreed well with experiments. Therefore, we designed and constructed a levitating transporter model, which can levitate a load of 200 kg with a gap of 16 mm, using the developed computer program.

    DOI: 10.1109/TASC.2005.850567

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  • Transient thermal characteristics of cryocooler-cooled HTS coil for SMES

    Ishiyama, A., Yanai, M., Morisaki, T., Ueda, H., Akita, S., Kouso, S., Tatsuta, Y., Abe, H., Tasaki, K.

    IEEE Transactions on Applied Superconductivity   15 ( 2 PART II )   1879 - 1882   2005年

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Thermal behavior of high-temperature super-conducting (HTS) coil is exceedingly different from that of low-temperature superconducting (LTS) coil. Therefore for the sake of the application of HTS coil to practical use, establishment of a new stability criterion for coil design becomes indispensable. In this study, a small-sized cryocooler-cooled HTS coil wound with Bi-2223/Ag tape was constructed and tested to evaluate the electromagnetic and thermal characteristics in the cryocooler-cooled HTS coil. We carried out experiments subjected to pulse current operation supposing SMES for power system stabilization. The simulation by a newly developed computer program based on the finite element method (FEM) agreed well with experimental results. In the computer program, short-sample data concerning the E-J characteristics, which depend on the orientation of applied magnetic field to the wide face of Bi-2223Ag tape, was adopted. By using the computer program, we also evaluate the thermal behavior of HTS coil graded according to the magnetic field distribution.

    DOI: 10.1109/TASC.2005.849321

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  • Operational characteristics of linear Synchronous actuator with field-cooled HTS bulk secondary

    Sato, A., Ueda, H., Ishiyama, A.

    IEEE Transactions on Applied Superconductivity   15 ( 2 PART II )   2234 - 2237   2005年

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    It is expected that HTS bulk materials will be applied to various electric devices. We have fabricated and tested a linear synchronous actuator with double-sided primary and HTS bulk secondary. The linear actuator consists of a field-cooled YBCO bulk for secondary (mover) and copper windings with iron core as a primary. The primary, which was excited by a three-phase VVVF power source to generate sinusoidal traveling magnetic field, was divided into two sections: 1) the starting section in which the secondary is accelerated as an induction machine; and 2) the synchronous section in which the secondary moves with a specified synchronous speed. As the secondary, two field-cooled bulks were arranged in certain interval. In this paper, for various intervals of bulks, we experimentally investigated the static characteristic in points of synchronous thrust force and the pull-in characteristics. And we developed a simulation program based on the finite element method (FEM) to investigate electromagnetic behavior within the bulk exposed to the magnetic field generated by the primary winding. We investigated the influence of the size, the number, and the interval of bulks on the static characteristic in points of synchronous thrust force by using the developed computer program.

    DOI: 10.1109/TASC.2005.849619

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  • YBCO線材の過電流パルス通電試験

    岩田拓也, 安東武利, 田中康武, 村上陽之, 牛久裕輔, 仲寛徳, 植田浩史, 石山敦士, 塩原融

    低温工学・超電導学会講演概要集   73rd   2005年

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  • Y系線材の過電流パルス通電特性評価(数値解析)

    安東武利, 岩田拓也, 田中康武, 村上陽之, 牛久裕輔, 仲寛徳, 植田浩史, 石山敦士, 塩原融

    低温工学・超電導学会講演概要集   72nd   2005年

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  • YBCO線材の過電流パルス通電時の特性劣化について

    田中康武, 安東武利, 岩田拓也, 村上陽之, 牛久裕輔, 仲寛徳, 植田浩史, 石山敦士, 斉藤隆, 塩原融

    低温工学・超電導学会講演概要集   73rd   2005年

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  • 高温超電導コイルのクエンチ保護に関する一考察

    仲寛徳, 牛久裕輔, 安東武利, 岩田拓也, 田中康武, 村上陽之, 植田浩史, 石山敦士, 塩原融

    低温工学・超電導学会講演概要集   73rd   2005年

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  • 数値解析に基づくYBCO超電導コイルの熱的特性評価

    安東武利, 岩田拓也, 田中康武, 村上陽之, 牛久裕輔, 仲寛徳, 植田浩史, 石山敦士, 塩原融

    低温工学・超電導学会講演概要集   73rd   2005年

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  • Y系線材の過電流パルス電通特性評価(実験)

    岩田拓也, 安東武利, 田中康武, 村上陽之, 牛久裕輔, 仲寛徳, 植田浩史, 石山敦士, 塩原融, 斉藤隆

    低温工学・超電導学会講演概要集   72nd   2005年

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  • 曲げ歪印加時のNb<sub>3</sub>Sn素線の臨界電流およびn値の数値解析・評価

    村上陽之, 広橋雅元, 植田浩史, 石山敦士, 小泉徳潔, 奥野清

    低温工学・超電導学会講演概要集   73rd   2005年

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  • バルク超電導体を用いた浮上搬送装置の設計・特性評価

    土屋元計, 土屋賢史, 東谷智史, 久藤勇哉, 植田浩史, 石山敦士

    電気学会全国大会講演論文集   2005 ( 5 )   2005年

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  • バルク超電導体のピン止め力を用いた搬送装置の基礎特性評価

    土屋元計, 土屋賢史, 東谷智史, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   72nd   2005年

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  • 高速多重極法を用いた超電導体を含む3次元電磁界解析

    植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   73rd   2005年

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  • バルク超電導体のピン止め力を用いた搬送装置の基礎特性実験

    土屋元計, 土屋賢史, 東谷智史, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   73rd   2005年

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  • Preliminary experiments of a tubular linear actuator in the vertical direction using YBCO bulk

    Sugawara, A., Ueda, H., Ishiyama, A.

    Superconductor Science and Technology   17 ( 5 )   S176 - S179   2004年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    We have been developing a new type of active-maglev system composed of field-cooled disc-shaped YBCO bulk and multiple ring-shaped electromagnets, which are vertically piled up. One of the useful features of the active-maglev system is that the levitation height is adjustable by varying the operating current through an electromagnet. Maximum levitation height in stable levitation, however, is restricted by the magnetic field distribution produced by the electromagnet. To enhance the levitation height, we have fabricated and tested an active-maglev system with multiple ring-shaped electromagnets instead of using a larger single electromagnet. Up to now, we have reported the experimental results in a model active-maglev system composed of five electromagnets and showed that the levitation height, as well as stability, can be remarkably improved by adjusting the operating current of each electromagnet individually. In this study, we constructed a model system operated as a tubular linear synchronous actuator in the vertical direction in expectation of it being applied in factory automation upgrading. The primary consists of six ring-shaped copper-winding coils without iron core and is supplied with three-phase sinusoidal excitation. A disc-shaped YBCO bulk, which was magnetized by a field-cooling process, was adopted as a secondary (mover). We carried out preliminary experiments to confirm the feasibility of synchronous operation and also numerically investigated the electromagnetic phenomenon within the bulk superconductor by a developed computer program based on the finite element method.

    DOI: 10.1088/0953-2048/17/5/017

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  • Dynamic characteristics and finite element analysis of a magnetic levitation system using a YBCO bulk superconductor

    Ueda, H., Ishiyama, A.

    Superconductor Science and Technology   17 ( 5 )   S170 - S175   2004年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    We have been developing a magnetic levitating device with two-dimensional movement, namely a 'levitating X-Y transporter'. For the real design of a levitating X-Y transporter, it is necessary to clarify the levitation characteristics, such as the lift, the levitation height and the stability against mechanical disturbances. Furthermore various kinds of force may be applied to the levitating part and cause mechanical oscillation. Therefore the characteristics of oscillation are also important factors in the dynamic stability of such a levitation system. In this paper, we examine experimentally the lift and the restoring force and develop a new simulation code based on the three-dimensional hybrid finite and boundary element method to analyse the dynamic electromagnetic behaviour of the HTS bulk. We have investigated a suitable permanent-magnet arrangement to enhance the levitation characteristics through experiment and numerical simulation. We can then determine the suitable conditions for stable levitation from those results.

    DOI: 10.1088/0953-2048/17/5/016

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  • Lift and restoring force characteristics of a levitating X-Y transporter using high-temperature superconducting bulks

    Iwamoto, M., Ueda, H., Ishiyama, A.

    Superconductor Science and Technology   17 ( 8 )   1042 - 1045   2004年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    We have been investigating the electromagnetic behaviour of HTS bulks for realizing an X-Y (two-dimensional) magnetic levitating transporter without any fixed guides. The transporter is mainly composed of disc-shaped YBCO bulks and Nd-Fe-B permanent magnets or field-cooled YBCO bulks. The lower part and the upper part (levitating part) are magnetically connected. In such a 'levitating X-Y transporter', it is necessary to comprehend the characteristics, such as the lift, the levitation height and the stability against mechanical disturbances. In this paper, we evaluated the lift and the restoring force characteristics experimentally in the case where a field-cooled YBCO bulk is adopted instead of permanent magnets and also developed a numerical simulation program based on the finite element method to clarify the electromagnetic phenomenon in the HTS bulks.

    DOI: 10.1088/0953-2048/17/8/017

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  • 3次元電磁界解析によるバルク超電導体を用いた浮上搬送装置の浮上特性評価

    植田浩史, 久藤勇哉, 東谷智史, 土屋賢史, 石山敦士

    低温工学・超電導学会講演概要集   70th   2004年

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  • バルク超電導体を用いた浮上搬送装置-磁極配置による浮上特性への影響-

    東谷智史, 土屋賢史, 久藤勇哉, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   70th   2004年

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  • バルク超電導体を用いた浮上搬送装置の開発-バックヨークの浮上特性への影響-

    東谷智史, 土屋賢史, 久藤勇哉, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   71st   2004年

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  • YBCO超電導線材の常電導転移特性評価(数値解析)

    牛久裕輔, 仲寛徳, 森崎徹, 柳井正浩, 植田浩史, 塩原融, 飯島康裕, 柿本一臣, 斎藤隆

    低温工学・超電導学会講演概要集   71st   2004年

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  • 電磁界解析によるバルク超電導体を用いた浮上搬送装置の特性評価

    植田浩史, 東谷智史, 土屋賢史, 久藤勇哉, 石山敦士

    電気学会超電導応用電力機器研究会資料   ASC-04 ( 31-43 )   2004年

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  • 3次元電磁界解析によるバルク超電導体を用いた浮上搬送装置の試設計と浮上特性評価

    植田浩史, 東谷智史, 土屋賢史, 久藤勇哉, 石山敦士

    低温工学・超電導学会講演概要集   71st   2004年

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  • YBCO線材の常電導転移・伝播特性

    牛久裕輔, 仲寛徳, 柳井正浩, 森崎徹, 植田浩史, 石山敦士, 塩原融

    低温工学・超電導学会講演概要集   70th   2004年

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  • 着磁したバルク超電導体を二次側走行子に用いたリニア同期アクチュエータの試作・特性評価

    柴田貴広, 広橋雅元, 佐藤飛鳥, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   70th   2004年

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  • バルク超電導体を含む電磁場解析

    植田浩史, 伊藤学, 森崎徹, 石山敦士

    電気学会超電導応用電力機器研究会資料   ASC-04 ( 17-30 )   2004年

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  • バルク超電導体を用いた浮上搬送装置-永久磁石の磁極配置による浮上特性への影響(その2)-

    東谷智史, 土屋賢史, 久藤勇哉, 岩本真実, 植田浩史, 石山敦士

    電気学会全国大会講演論文集   2004 ( 5 )   2004年

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  • YBCO線材の常電導転移・伝播特性

    仲寛徳, 牛久祐輔, 柳井正浩, 植田浩史, 石山敦士, 塩原融

    電気学会全国大会講演論文集   2004 ( 5 )   2004年

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  • 着磁したバルク超電導体を二次側走行子とするリニア同期アクチュエータの試作と基礎実験

    広橋雅元, 柴田貴広, 佐藤飛鳥, 植田浩史, 石山敦士

    電気学会全国大会講演論文集   2004 ( 5 )   2004年

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  • 次世代超電導線材の開発と特性評価 YBCO線材の常電導転移・伝播特性評価

    石山敦士, 柳井正浩, 植田浩史, 飯島康裕, 斉藤隆, 塩原融

    低温工学   39 ( 11 )   2004年

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  • バルク超電導体を用いた鉛直方向リニア・アクチュエータ

    伊藤祐介, 田代靖貴, 植田浩史, 石山敦士

    電気学会全国大会講演論文集   2004 ( 5 )   2004年

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  • バルク超電導体を用いた磁気浮上搬送装置の開発-製作と特性評価-

    土屋賢史, 東谷智史, 久藤勇哉, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   71st   2004年

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  • 複数のコイルとバルク超電導体を用いたアクティブ磁気浮上位置制御の改善

    伊藤祐介, 田代靖貴, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   71st   2004年

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  • 複数のコイルとバルク超電導体を用いたアクティブ磁気浮上位置制御

    伊藤祐介, 田代靖貴, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   70th   2004年

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  • YBCO超電導線材の常電導転移特性評価(実験)

    仲寛徳, 牛久裕輔, 森崎徹, 柳井正浩, 植田浩史, 塩原融, 飯島康裕, 柿本一臣, 斎藤隆

    低温工学・超電導学会講演概要集   71st   2004年

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  • 着磁されたバルク超電導体の交流磁界印加特性

    植田浩史, 清水英仁, 石山敦士

    電気学会超電導応用電力機器研究会資料   13 ( 2 )   2283 - 2286   2003年6月

  • バルク超電導体を用いた浮上搬送装置の特性評価

    岩本真実, 久藤勇哉, 植田浩史, 石山敦士

    電気学会超電導応用電力機器研究会資料   13 ( 2 II )   2161 - 2164   2003年

  • 着磁したバルク超電導体を二次側走行子とするリニア同期アクチュエータの試作・実験

    高橋淳, 定方俊吾, 植田浩史, 石山敦士

    電気学会超電導応用電力機器研究会資料   13 ( 2 II )   2251 - 2254   2003年

  • A new type of active-maglev system using YBCO bulk and multiple electromagnets

    Kamoshida, R., Ueda, H., Ishiyama, A.

    IEEE Transactions on Applied Superconductivity   13 ( 2 )   2157 - 2160   2003年

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    記述言語:英語   出版者・発行元:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    We have been developing a new type of active-maglev system that is a transporter in the vertical direction, consisting of high-temperature bulk superconductors and multiple electromagnets piled up on the vertical axis. In a previous paper, using an active-maglev system composed of a disk-shaped YBCO bulk and five electromagnets, we have demonstrated continuous levitation and verified that its levitation height, as well as stability, call be remarkably improved by adjusting the operating current of the electromagnets individually. Electromagnetic behavior within the bulk has been also investigated numerically by a newly developed computer program based on the finite-element method adopting the Bean model. Agreement of levitation force and height between experiments and numerical analyses was good. The levitation force properties strongly depend on the field-cooling condition and the distribution and magnitude of the external magnetic field generated by the electromagnets.,We clarify electromagnetic phenomena within the bulk superconductor by the computer program developed to improve the levitation properties for applications of continuous levitation to real maglev systems.

    DOI: 10.1109/TASC.2003.813023

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  • 着磁したバルク超電導体を二次側走行子とするリニア同期アクチュエータの試作・実験

    佐藤飛鳥, 井比敏男, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   68th   2003年

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  • Y系超電導テープ線材の常電導転移特性

    柳井正浩, 曽我部義高, 植田浩史, 石山敦士, 塩原融

    低温工学・超電導学会講演概要集   69th   2003年

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  • 複数のコイルとバルク超電導体による鉛直方向搬送実験

    田代靖貴, 菅原淳史, 植田浩史, 石山敦士

    低温工学・超電導学会講演概要集   68th   2003年