MISC - 金　錫範

(50T・500A/mm²・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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記述言語：日本語  

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Electrical Characteristic Analysis According to Contact Resistance Between Turns of HTS Coil

Hyung-Wook Kim, Jin Hur, Seog-Whan Kim, Dong-Woo Ha, Rock-Kil Ko, Jung-Pyo Hong, Ji Hyung Kim, Ho Min Kim, Jin-Hong Joo, Seok-Beom Kim, Young-Sik Jo

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

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記述言語：英語   出版者・発行元：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

This paper presents our analysis of the output characteristics of a high-temperature superconductor (HTS) coil depending on the turn-to-turn contact resistance. Important design factors were investigated by taking into account the turn-toturn contact resistance based on the analysis results. Analyses were performed on five self-fabricated coil models with different turn-to-turn contact resistances. To consider only the turn-to-turn contact resistance, we used a first-generation HTS BSCCO wire with simpler architecture and mechanical properties than the second-generation HTS wire. From this study, it was confirmed by experiment that as the turn-to-turn contact resistance decreases, the electrical stability increases but the output efficiency decreases compared with the input.

DOI： 10.1109/TASC.2016.2540162

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Study on the magnetic field homogeneity of stacked HTS bulk magnets including the deteriorated HTS bulk by crack for compact NMR relaxometry

K. Hojo, S. B. Kim, D. Miyazawa, R. Nomura, S. Fukada

PROCEEDINGS OF THE 28TH INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS 2015)   81   166 - 169   2016年

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We have been studying the compact magnet for NMR device that consists of a stacked high temperature superconducting (HTS) GdBCO bulk annuli trapped by a field cooling (FC) method. It was difficult to trap the uniform magnetic field above 4.7 T ( 200 MHz-class NMR magnet) and field homogeneity under 0.01 ppm/cm(3) at liquid nitrogen temperature (77.4 K) because of the low Jc-B characteristics of present HTS bulks. On the other hand, the strength and homogeneity of the magnetic field required for NMR relaxometry device are 1.5 T and 150 ppm/cm(3) respectively. Therefore, we have been investigating the development of the compact magnet for NMR relaxometry device. In our previous study, we obtained the trapped magnetic field over 1.5 T at 77.4 K using the stacked HTS bulk magnet with 80 mm height, and 150 ppm/cm(3) field homogeneity was obtained using the fabricated field compensation methods on inner diameter of 20 mm HTS bulk magnet. However, it is expected that the asymmetric problem of the magnetic field uniformity will be occurred by the crack in the HTS bulks with long-term operation. Therefore, in this study, the field homogeneity of HTS bulk magnet by the arrangement of the HTS bulk with crack was investigated using 3-D FEM analysis. We examined the effects of the stacking position of HTS bulk with the crack and the allowable range of degradation of HTS bulk to achieve the target field homogeneity of 150 ppm/cm(3). (C) 2016 The Authors. Published by Elsevier B.V.

DOI： 10.1016/j.phpro.2016.04.042

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

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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記述言語：英語   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).

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Study on the Shape Optimization of the HTS Bulk Magnets With Active Compensation for Compact NMR Relaxometry Magnets

S. Kim, D. Ishizuka, H. Kitamura, D. Miyazawa

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   4602404 - 4602404   2015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  

Compact NMR magnets consisted of the stacked HTS bulk annuli trapped by a field cooling (FC) method have been suggested and developed. The strength and homogeneity of the magnetic field required for the NMR relaxometry device are 1.5 T and 150 ppm/cm(3) respectively, and these values are much lower than the conventional NMR device. It is relatively easy to generate a magnetic field over 1.5 T at 77.4 K using the stacked HTS bulk annuli, but it is still hard to obtain 150 ppm/cm(3) field homogeneity with the conventional superconducting magnet (SCM) as the magnetizing magnets. In this paper, to improve the trapped magnetic field homogeneity and to obtain the enlarged sample space of HTS bulk magnet for compact NMR relaxometry, the HTS bulk magnet with 10 mm gap length in the center region of HTS bulk magnet (we call it " split coil-shaped HTS bulks") were proposed and studied as the functions of size and shape of HTS bulk. It was studied using 3D FEM based electromagnetic analysis. The improved field homogeneity was obtained by using hybrid models consisted with the HTS bulk and attached small size HTS coil.

DOI： 10.1109/TASC.2014.2374337

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The Study to Improve the Field Homogeneity of the NMR Relaxometry Magnets Using the Packaged HTS Bulks With Various Iron Rings

S. B. Kim, H. Kitamura, D. Ishizuka, D. Miyazawa

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   4602204 - 4602204   2015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  

The compact magnet for NMR device that consists of a stacked high temperature superconducting (HTS) Gd-Ba-Cu-O bulk annuli was trapped by a field cooling method. However, it was difficult to trap the uniform magnetic field above 4.7 T (200 MHz-class NMR magnet) and field homogeneity under 0.01 ppm/cm3 at liquid nitrogen temperature (77.4 K) because of the low Jc-B characteristics of present HTS bulks. On the other hand, the strength and homogeneity of the magnetic field required for NMR relaxometry device are 1.5 T and 150 ppm/cm3 respectively. It is easily to generate the trapped magnetic field over 1.5 T at 77.4 K using the stacked HTS bulks, but it is still hard to obtain 150 ppm/cm3 field homogeneity with the conventional superconducting magnet (SCM) as the magnetizing magnets. Therefore, we have studied the compensation methods to improve the field homogeneity. In this paper, we proposed the packaged HTS bulk magnet consisted of HTS bulks annuli and various iron rings as the field compensation, and investigated it in analysis and experiment.

DOI： 10.1109/TASC.2014.2372896

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Study on the Dynamic Stability of 3-D Superconducting Actuator by Various Typed HTS Bulk Movers

S. Kim, H. Nakano, S. Ozasa, M. Sawae

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   3601104 - 3601104   2015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  

High-temperature superconductor (HTS) material can trap high magnetic fields due to its strong flux pinning force. Herein, based on our belief that such a device would be useful as a transporter in clean rooms where silicon wafers are manufactured, we report on the development of a three-dimensional (3-D) superconducting actuator using HTS bulk material in a noncontact transportation device that will move freely in 3-D space. The proposed actuator consists of a trapped HTS, which provides the mover, along with two-dimensionally arranged copper-wound iron-core electromagnets that form the stator. The current and the polarity of each electromagnet can be individually controlled via the power supply. In our previous experiments, a singlecomponent mover was observed to overshoot during operation, which led us to conclude that a more powerful levitation force was needed. In this study, single-component HTS movers (inner diameters of 46 and 60 mm) and multicomponent HTS movers were used to increase the levitation force and dynamic stability.

DOI： 10.1109/TASC.2015.2393055

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Study of Magnetomotive Force Control Type Superconducting Magnet Using BSCCO HTS Wire

Hyung-Wook Kim, Young-Sik Jo, Seog-Whan Kim, Rock-Kil Ko, Dong-Woo Ha, Ho Min Kim, Jin-Hong Joo, Hyung-Jin Kim, Seok-Beom Kim, Jin Hur

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   4600804 - 4600804   2015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  

In this study, a method for controlling the magnetomotive force using the current bypass of no-insulation magnets was developed, and the characteristics of 1G high-temperature superconductivity (HTS) no-insulation magnets were elucidated through experiments. The experiments were performed using a magnet designed with bismuth strontium calcium copper oxide HTS wires. Film-type heaters were used to control the MMF. The analysis of the experimental results was carried out in conjunction with an analysis using finite elements method.

DOI： 10.1109/TASC.2014.2365549

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Development of Magnetic Field Control System Using HTS Bulk for ON/OFF Field Switching and Magnetic Field Amplification

S. B. Kim, T. Abe, I. Eritate, M. Takahashi, S. Shima, A. Nakashima

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   4603104 - 4603104   2015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  

High magnetic fields are used in many branches of modern medicine. So, the techniques for magnetic field concentration are very important, and the novel electromagnets and trapped HTS bulk magnets have been fabricated and used in the cell culture and the bulk magnetic drug delivery system. In general, although superconducting magnet can generate high magnetic fields, ON/OFF magnetic switching is impossible because of its large inductance. Therefore, not only the generating of magnetic field but also controlling of magnetic field including ON/OFF switching are very important issues. So, we have been studied the control methods of magnetic field using HTS bulks. In this study, the magnetic field control system consisted of the various shaped HTS bulks and magnetic sources were proposed to achieve the ON/OFF field control and field amplification. The shape of HTS bulk to develop the magnetic control system was optimized by FEM based on analysis, and the abilities of its field switching and amplification were confirmed by experiments. We found that the HTS bulk with slit did control the applied magnetic field, and amplified magnetic fields were obtained at slit parts of HTS bulks.

DOI： 10.1109/TASC.2014.2379946

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Development of Magnetic Field Control System Using HTS Bulks and HTS Coil for MDDS

S. B. Kim, I. Eritate, T. Abe, M. Takahashi, S. Shima, A. Nakashima

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   4602704 - 4602704   2015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  

Magnetic drug delivery system (MDDS) is a key technology effects in the medical applications, and also the magnetic force control is a very important issue in MDDS. In general, the high magnetic field along the axial direction and high magnetic field gradient along the longitudinal direction are very useful for MDDS. So, we proposed the new magnetic force control system consists of superconducting magnet, high temperature superconductors (HTS) bulks or tapes and irons. In this system, the shielding currents in HTS bulks and tapes due to the diamagnetism of the superconductor generate the magnetic field with same direction of external magnetic field, and we can control the magnetic field gradient along the longitudinal direction by the arrangement of the superconductors and irons. In this study, the stacked GdBCO tapes were used in experiments and electromagnetic analysis based on finite-element method was carried out to optimize the arrangement of the superconductors and the irons. It was confirmed the control of magnetic field gradient along the longitudinal direction was possible by arranging the HTS bulks, tapes and irons on the superconducting magnet. In analysis, the magnetic field of 164.6 mT and field gradient of 1.89 T/m were obtained.

DOI： 10.1109/TASC.2014.2376992

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The Levitation Characteristics of the Noncontact Rotating System Using HTS Bulks Trapped by Permanent Magnets

S. B. Kim, Y. Fujii, K. Nakamura, M. Takahashi

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   25 ( 3 )   3600904 - 3600904   2015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 studied a noncontact magnetic levitation system using the ring-shaped high-temperature superconducting (HTS) bulks and ring-shaped permanent magnets (PMs). Because HTS bulks were magnetized by PMs fixed between the HTS bulks, these PMs levitated with strong restoring force. We used the stator coil to rotate the iron shaft that was combined with PMs. In order to rotate the shaft stable, a restoring force of the radial direction was important. Thus, we placed ring-shaped PMs that magnetized in the radial direction with the inner part of the HTS bulks. In this rotating system, we focused on two parameters, the rotation and the control. In the rotation, we measured the maximum rotational speed and the axial vibration caused by increasing of rotational speed. In the control, we measured slippage from the convergence position when rotated by 60 degrees. In addition, we compared the slippage by changing the conditions.

DOI： 10.1109/TASC.2014.2383411

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

D. Miyazawa, S. B. Kim, H. Kitamura, D. Ishizuka, K. Hojo

Proceedings of the 27th International Symposium on Superconductivity (ISS 2014)   65   245 - 248   2015年

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We have been studying the compact magnet for NMR device that consists of a stacked high temperature superconducting (HTS) GdBCO bulk annuli. We can generate the trapped magnetic field over 1.5 T at 77.4 K and 150 ppm/cm(3) on inner diameter of 20 mm HTS bulks using field compensation methods. However, it is necessary to enlarge the inner diameter of the HTS bulk magnet because the diameter of commercial NMR probe is larger than 20 mm. In this paper, we studied an optimal shape of the stacked HTS bulk magnet to obtain the enlarged inner diameter using 3-D FEM based analysis. We was able to enlarge the inner diameter of the HTS bulk magnet from 20 mm to 34 mm remaining magnetic field strength of 1.5 T and magnetic field homogeneity of 666 ppm/cm(3) by proposed passive field compensation method. (C) 2015 The Authors. Published by Elsevier Ltd. 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.2015.05.135

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