2024/03/27 更新

写真a

タカトリ サユリ
高取 沙悠理
TAKATORI Sayuri
所属
異分野基礎科学研究所 助教(特任)
職名
助教(特任)
外部リンク

学位

  • 博士(理学)

研究分野

  • 自然科学一般 / 素粒子、原子核、宇宙線、宇宙物理にする実験

経歴

  • 理化学研究所   客員研究員

    2022年7月 - 現在

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  • 岡山大学 異分野基礎科学研究所   量子宇宙研究コア   研究助教(特任)

    2022年4月 - 現在

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  • 日本学術振興会 特別研究員(DC2)

    2019年4月 - 2021年9月

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論文

  • Calibration of detector time constant with a thermal source for the POLARBEAR-2A CMB polarization experiment

    S. Takatori, M. Hasegawa, M. Hazumi, D. Kaneko, N. Katayama, A. T. Lee, S. Takakura, T. Tomaru, T. Adkins, D. Barron, Y. Chinone, K. T. Crowley, T. de Haan, T. Elleflot, N. Farias, C. Feng, T. Fujino, J. C. Groh, H. Hirose, F. Matsuda, H. Nishino, Y. Segawa, P. Siritanasak, A. Suzuki, K. Yamada

    The 15th Asia Pacific Physics Conference (APPC15)   2024年3月

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    The Simons Array (SA) project is a ground-based Cosmic Microwave Background
    (CMB) polarization experiment. The SA observes the sky using three telescopes,
    and POLARBEAR-2A (PB-2A) is the receiver system on the first telescope. For the
    ground-based experiment, atmospheric fluctuation is the primary noise source
    that could cause polarization leakage. In the PB-2A receiver system, a
    continuously rotating half-wave plate (HWP) is used to mitigate the
    polarization leakage. However, due to the rapid modulation of the polarization
    signal, the uncertainty in the time constant of the detector results in an
    uncertainty in the polarization angle. For PB-2A, the time constant of each
    bolometer needs to be calibrated at the sub-millisecond level to avoid
    introducing bias to the polarization signal. We have developed a new calibrator
    system that can be used to calibrate the time constants of the detectors. In
    this study, we present the design of the calibration system and the preliminary
    results of the time constant calibration for PB-2A.

    arXiv

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    その他リンク: http://arxiv.org/pdf/2403.16620v1

  • Application of transition-edge sensor for micro-X-ray fluorescence measurements and micro-X-ray absorption near edge structure spectroscopy: a case study of uranium speciation in biotite obtained from uranium mine

    Takumi Yomogida, Tadashi Hashimoto, Takuma Okumura, Shinya Yamada, Hideyuki Tatsuno, Hirofumi Noda, Ryota Hayakawa, Sayuri Takatori, Shinji Okada, Tadaaki Isobe, Takahiro Hiraki, Toshiki Sato, Yuichi Toyama, Yuto Ichinohe, Oki Sekizawa, Kiyofumi Nitta, Yuichi Kurihara, Shigeru Fukushima, Tomoya Uruga, Yoshihiro Kitatsuji, Yoshio Takahashi

    The Analyst   2024年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Royal Society of Chemistry (RSC)  

    In this study, we successfully applied a transition-edge sensor (TES) spectrometer as a detector for microbeam X-ray measurements from a synchrotron X-ray light source in hard X-ray region to determine...

    DOI: 10.1039/d4an00059e

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  • Experimental apparatus for detection of radiative decay of $$^{229}$$Th isomer from Th-doped CaF$$_2$$

    Takahiro Hiraki, Kjeld Beeks, Michael Bartokos, Hiroyuki Fujimoto, Yuta Fukunaga, Hiromitsu Haba, Yoshitaka Kasamatsu, Shinji Kitao, Adrian Leitner, Takahiko Masuda, Guan Ming, Nobumoto Nagasawa, Ryoichiro Ogake, Koichi Okai, Martin Pimon, Martin Pressler, Noboru Sasao, Fabian Schaden, Thorsten Schumm, Makoto Seto, Yudai Shigekawa, Koutaro Shimizu, Tomas Sikorsky, Kenji Tamasaku, Sayuri Takatori, Tsukasa Watanabe, Atsushi Yamaguchi, Yoshitaka Yoda, Akihiro Yoshimi, Koji Yoshimura

    Hyperfine Interactions   245 ( 1 )   2024年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s10751-024-01844-x

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    その他リンク: https://link.springer.com/article/10.1007/s10751-024-01844-x/fulltext.html

  • Design and performance of a gain calibration system for the POLARBEAR-2a receiver system at the Simons Array cosmic microwave background experiment

    Daisuke Kaneko, Sayuri Takatori, Masaya Hasegawa, Masashi Hazumi, Yuki Inoue, Oliver Jeong, Nobuhiko Katayama, Adrian T. Lee, Frederick Matsuda, Haruki Nishino, Praween Siritanasak, Aritoki Suzuki, Satoru Takakura, Takayuki Tomaru

    Journal of Astronomical Telescopes, Instruments, and Systems   10 ( 01 )   2024年1月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:SPIE-Intl Soc Optical Eng  

    DOI: 10.1117/1.jatis.10.1.018003

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  • Constraints on axionlike polarization oscillations in the cosmic microwave background with POLARBEAR

    Shunsuke Adachi, Tylor Adkins, Kam Arnold, Carlo Baccigalupi, Darcy Barron, Kolen Cheung, Yuji Chinone, Kevin T. Crowley, Josquin Errard, Giulio Fabbian, Chang Feng, Raphael Flauger, Takuro Fujino, Daniel Green, Masaya Hasegawa, Masashi Hazumi, Daisuke Kaneko, Nobuhiko Katayama, Brian Keating, Akito Kusaka, Adrian T. Lee, Yuto Minami, Haruki Nishino, Christian L. Reichardt, Praween Siritanasak, Jacob Spisak, Osamu Tajima, Satoru Takakura, Sayuri Takatori, Grant Paul Teply, Kyohei Yamada

    Physical Review D   108 ( 4 )   2023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:American Physical Society (APS)  

    DOI: 10.1103/physrevd.108.043017

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    その他リンク: https://link.aps.org/article/10.1103/PhysRevD.108.043017

  • Vacuum Ultraviolet Search from Thorium-229 Isomer in Crystal Toward Solid-State Nuclear Clock

    S. Takatori, Y. Fukunaga, M. Guan, T. Hiraki, T. Masuda, R. Ogake, K. Okai, N. Sasao, K. Shimizu, S. Uetake, A. Yoshimi, K. Yoshimura, M. Yoshimura, K. Tamasaku, Y. Kasamatsu, Y. Yasuda, K. Beeks, F. Schaden, T. Schumm, S. Kitao, M. Seto, H. Fujimoto, T. Watanabe, K. Konashi, M. Watanabe, H. Haba, Y. Shigekawa, A. Yamaguchi, N. Nagasawa, Y. Yoda

    2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)   2023年5月

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    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  

    DOI: 10.1109/eftf/ifcs57587.2023.10272086

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  • High-sensitive XANES analysis at Ce L2-edge for Ce in bauxites using transition-edge sensors: Implications for Ti-rich geological samples

    Wenshuai Li, Shinya Yamada, Tadashi Hashimoto, Takuma Okumura, Ryota Hayakawa, Kiyofumi Nitta, Oki Sekizawa, Hiroki Suga, Tomoya Uruga, Yuto Ichinohe, Toshiki Sato, Yuichi Toyama, Hirofumi Noda, Tadaaki Isobe, Sayuri Takatori, Takahiro Hiraki, Hideyuki Tatsuno, Nao Kominato, Masaki Ito, Yusuke Sakai, Hajime Omamiuda, Akiko Yamaguchi, Takumi Yomogida, Hikaru Miura, Makoto Nagasawa, Shinji Okada, Yoshio Takahashi

    Analytica Chimica Acta   1240   340755 - 340755   2023年2月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.aca.2022.340755

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  • On-site detector noise characterization of the POLARBEAR-2a receiver

    Nicole Farias, Megan Russell, Daisuke Kaneko, Sayuri Takatori, Adrian T. Lee, Kam Arnold, Tylor Adkins, Darcy R. Barron, Kevin T. Crowley, Tucker Elleflot, Takuro Fujino, Masaya Hasegawa, Jennifer Ito, Lindsay N. Lowry, Yume Nishinomiya, Christopher Raum, Praween Siritanasak, Benjamin Westbrook, Kyohei Yamada

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI   2022年8月

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    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:SPIE  

    DOI: 10.1117/12.2627513

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  • Improved upper limit on degree-scale CMB B-mode polarization power from the 670 square-degree POLARBEAR survey

    The POLARBEAR Collaboration, S. Adachi, T. Adkins, M. A. O. Aguilar Faúndez, K. S. Arnold, C. Baccigalupi, D. Barron, S. Chapman, K. Cheung, Y. Chinone, K. T. Crowley, T. Elleflot, J. Errard, G. Fabbian, C. Feng, T. Fujino, N. Galitzki, N. W. Halverson, M. Hasegawa, M. Hazumi, H. Hirose, L. Howe, J. Ito, O. Jeong, D. Kaneko, N. Katayama, B. Keating, T. Kisner, N. Krachmalnicoff, A. Kusaka, A. T. Lee, E. Linder, A. I. Lonappan, L. N. Lowry, F. Matsuda, T. Matsumura, Y. Minami, M. Murata, H. Nishino, Y. Nishinomiya, D. Poletti, C. L. Reichardt, C. Ross, Y. Segawa, P. Siritanasak, R. Stompor, A. Suzuki, O. Tajima, S. Takakura, S. Takatori, D. Tanabe, G. Teply, K. Yamada, Y. Zhou

    The Astrophysical Journal   931 ( 2 )   101 - 101   2022年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Astronomical Society  

    We report an improved measurement of the degree-scale cosmic microwave
    background $B$-mode angular-power spectrum over 670 square-degree sky area at
    150 GHz with POLARBEAR. In the original analysis of the data, errors in the
    angle measurement of the continuously rotating half-wave plate, a polarization
    modulator, caused significant data loss. By introducing an angle-correction
    algorithm, the data volume is increased by a factor of 1.8. We report a new
    analysis using the larger data set. We find the measured $B$-mode spectrum is
    consistent with the $\Lambda$CDM model with Galactic dust foregrounds. We
    estimate the contamination of the foreground by cross-correlating our data and
    Planck 143, 217, and 353 GHz measurements, where its spectrum is modeled as a
    power law in angular scale and a modified blackbody in frequency. We place an
    upper limit on the tensor-to-scalar ratio $r$ < 0.33 at 95% confidence level
    after marginalizing over the foreground parameters.

    DOI: 10.3847/1538-4357/ac6809

    arXiv

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    その他リンク: http://arxiv.org/pdf/2203.02495v2

  • Integrated Electrical Properties of the Frequency Multiplexed Cryogenic Readout System for Polarbear/Simons Array

    Darcy Barron, Kayla Mitchell, John Groh, Kam Arnold, Tucker Elleflot, Logan Howe, Jen Ito, Adrian T. Lee, Lindsay N. Lowry, Adam Anderson, Jessica Avva, Tylor Adkins, Carlo Baccigalupi, Kolen Cheung, Yuji Chinone, Oliver Jeong, Nobu Katayama, Brian Keating, Joshua Montgomery, Haruki Nishino, Christopher Raum, Praween Siritanasak, Aritoki Suzuki, Sayuri Takatori, Calvin Tsai, Benjamin Westbrook, Yuyang Zhou

    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY   31 ( 5 )   2021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:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    POLARBEAR/Simons Array is a cosmic microwave background (CMB) polarization experiment, with science goals including a deep search for CMB B-mode polarization created by inflationary gravitational waves, and characterization of the CMB B-mode signal from gravitational lensing. When completed, Simons Array will have over 20,000 superconducting transition-edge sensor bolometers, cooled to 300 mK with closed-cycle cryogenics. This significant increase in detectors and sensitivity is enabled by advancements in frequency multiplexed readout. The detectors are read out with DfMux digital frequency-domain multiplexing, with 40 channels read out by each SQUID array, with frequency channels between 1 and 5 MHz defined by an inductor and capacitor in series with each detector. After the system was completed and characterized for POLARBEAR-2a, modifications were made that further improved performance for POLARBEAR-2b. We present the characterization of the integrated cryogenic readout system for POLARBEAR-2a and POLARBEAR-2b, and comparison of properties including stray impedance and frequency scatter.

    DOI: 10.1109/TASC.2021.3067190

    Web of Science

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  • Method for Rapid Performance Validation of Large TES Bolometer Array for POLARBEAR-2A Using a Coherent Millimeter-Wave Source

    Yuuko Segawa, Haruaki Hirose, Daisuke Kaneko, Masaya Hasegawa, Shunsuke Adachi, Peter Ade, Mario Andres Osvaldo Aguilar Faundez, Yoshiki Akiba, Kam Arnold, Jessica Avva, Carlo Baccigalupi, Darcy Barron, Dominic Beck, Shawn Beckman, Federico Bianchini, David Boettger, Julian Borrill, Julien Carron, Scott Chapman, Kolen Cheung, Yuji Chinone, Kevin Crowley, Ari Cukierman, Tijmen de Haan, Matt Dobbs, Rolando Dunner, Hamza El Bouhargani, Tucker Elleflot, Josquin Errard, Giulio Fabbian, Stephen Feeney, Chang Feng, Takuro Fujino, Nicholas Galitzki, Neil Goeckner-Wald, John Groh, Grantland Hall, Nils Halverson, Takaho Hamada, Masashi Hazumi, Charles Hill, Logan Howe, Yuki Inoue, Jennifer Ito, Greg Jaehnig, Oliver Jeong, Nobuhiko Katayama, Brian Keating, Reijo Keskitalo, Shuhei Kikuchi, Theodore Kisner, Nicoletta Krachmalnicoff, Akito Kusaka, Adrian T. Lee, David Leon, Eric Linder, Lindsay Ng Lowry, Aashrita Mangu, Frederick Matsuda, Yuto Minami, Josh Montgomery, Martin Navaroli, Haruki Nishino, Julien Peloton, Anh Thi Phuong Pham, Davide Poletti, Giuseppe Puglisi, Christopher Raum, Christian L. Reichardt, Colin Ross, Maximiliano Silva-Feaver, Praween Siritanasak, Radek Stompor, Aritoki Suzuki, Osamu Tajima, Satoru Takakura, Sayuri Takatori, Daiki Tanabe, Grant P. Teply, Calvin Tsai, Clara Verges, Ben Westbrook, Yuyang Zhou

    PROCEEDINGS OF THE 14TH ASIA-PACIFIC PHYSICS CONFERENCE   2319   2021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  

    POLARBEAR-2A is the first receiver for the Simons Array cosmic micmwave background polarization experiment. POLARBEAR-2A has transition-edge sensor bolometers on the focal plane. Signals from bolometers arc multiplexed and read out by a single SQUID. The receiver was deployed in late 2018 in Atacama, Chile, and operation started in 2019, where rapid confirmation of correspondence between bolometers and multiplexed readout channels was important as an initial step of performance validation. For this purpose, we devised a method using a coherent source that allows us to identify the frequency band and polarization sensitivity angle for each readout channel without detailed bolometer tuning.

    DOI: 10.1063/5.0038197

    Web of Science

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  • Data acquisition and management system for the CMB polarization experiment: Simons Array

    Haruki Nishino, Darcy Barron, Amy N. Bender, Yuji Chinone, Kevin T. Crowley, Tucker Elleflot, John Groh, Masaya Hasegawa, Masashi Hazumi, Charles A. Hill, Haruaki Hirose, Logan Howe, Daisuke Kaneko, Shuhei Kikuchi, Theodore Kisner, Akito Kusaka, Joshua Montgomery, Alexandra S. Rahlin, Praween Siritanasak, Graeme Smecher, Satoru Takakura, Sayuri Takatori, Daiki Tanabe, Benjamin Westbrook, Nathan Whitehorn, Alex Zahn, Yuyang Zhou

    Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X   2020年12月

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    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:SPIE  

    DOI: 10.1117/12.2560616

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  • A measurement of the CMB E-mode angular power spectrum at subdegree scales from 670 square degrees of POLARBEAR data

    S. Adachi, M. A. O. Aguilar Faúndez, K. Arnold, C. Baccigalupi, D. Barron, D. Beck, F. Bianchini, S. Chapman, K. Cheung, Y. Chinone, K. Crowley, M. Dobbs, H. El Bouhargani, T. Elleflot, J. Errard, G. Fabbian, C. Feng, T. Fujino, N. Galitzki, N. Goeckner-Wald, J. Groh, G. Hall, M. Hasegawa, M. Hazumi, H. Hirose, A. H. Jaffe, O. Jeong, D. Kaneko, N. Katayama, B. Keating, S. Kikuchi, T. Kisner, A. Kusaka, A. T. Lee, D. Leon, E. Linder, L. N. Lowry, F. Matsuda, T. Matsumura, Y. Minami, M. Navaroli, H. Nishino, A. T. P. Pham, D. Poletti, C. L. Reichardt, Y. Segawa, P. Siritanasak, O. Tajima, S. Takakura, S. Takatori, D. Tanabe, G. P. Teply, C. Tsai, C. Vergès, B. Westbrook, Y. Zhou

    The Astrophysical Journal   904 ( 1 )   65 - 65   2020年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Astronomical Society  

    We report a measurement of the E-mode polarization power spectrum of the
    cosmic microwave background (CMB) using 150 GHz data taken from July 2014 to
    December 2016 with the POLARBEAR experiment. We reach an effective polarization
    map noise level of $32\,\mu\mathrm{K}$-$\mathrm{arcmin}$ across an observation
    area of 670 square degrees. We measure the EE power spectrum over the angular
    multipole range $500 \leq \ell <3000$, tracing the third to seventh acoustic
    peaks with high sensitivity. The statistical uncertainty on E-mode bandpowers
    is $\sim 2.3 \mu {\rm K}^2$ at $\ell \sim 1000$ with a systematic uncertainty
    of 0.5$\mu {\rm K}^2$. The data are consistent with the standard $\Lambda$CDM
    cosmological model with a probability-to-exceed of 0.38. We combine recent CMB
    E-mode measurements and make inferences about cosmological parameters in
    $\Lambda$CDM as well as in extensions to $\Lambda$CDM. Adding the ground-based
    CMB polarization measurements to the Planck dataset reduces the uncertainty on
    the Hubble constant by a factor of 1.2 to $H_0 = 67.20 \pm 0.57 {\rm km\,s^{-1}
    \,Mpc^{-1 } }$. When allowing the number of relativistic species ($N_{eff}$) to
    vary, we find $N_{eff} = 2.94 \pm 0.16$, which is in good agreement with the
    standard value of 3.046. Instead allowing the primordial helium abundance
    ($Y_{He}$) to vary, the data favor $Y_{He} = 0.248 \pm 0.012$. This is very
    close to the expectation of 0.2467 from Big Bang Nucleosynthesis. When varying
    both $Y_{He}$ and $N_{eff}$, we find $N_{eff} = 2.70 \pm 0.26$ and $Y_{He} =
    0.262 \pm 0.015$.

    DOI: 10.3847/1538-4357/abbacd

    arXiv

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    その他リンク: http://arxiv.org/pdf/2005.06168v1

  • Effect of Stray Impedance in Frequency-Division Multiplexed Readout of TES Sensors in POLARBEAR-2b

    T. Elleflot, K. Arnold, D. Barron, K. T. Crowley, M. Dobbs, J. Groh, M. Hasegawa, M. Hazumi, C. Hill, L. Howe, J. Ito, O. Jeong, D. Kaneko, N. Katayama, B. Keating, A. Kusaka, A. T. Lee, L. N. Lowry, C. Raum, J. Seibert, M. Silva-Feaver, P. Siritanasak, A. Suzuki, S. Takakura, S. Takatori, C. Tsai, B. Westbrook

    Journal of Low Temperature Physics   199 ( 3-4 )   840 - 848   2020年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s10909-020-02387-5

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    その他リンク: http://link.springer.com/article/10.1007/s10909-020-02387-5/fulltext.html

  • Deployment of Polarbear-2A

    Daisuke Kaneko, S. Adachi, P. A. R. Ade, M. Aguilar Faúndez, Y. Akiba, K. Arnold, C. Baccigalupi, D. Barron, D. Beck, S. Beckman, F. Bianchini, D. Boettger, J. Borrill, J. Carron, S. Chapman, K. Cheung, Y. Chinone, K. Crowley, A. Cukierman, M. Dobbs, R. Dűnner, H. El-Bouhargani, T. Elleflot, J. Errard, G. Fabbian, S. M. Feeney, C. Feng, T. Fujino, N. Galitzki, A. Gilbert, N. Goeckner-Wald, J. Groh, G. Hall, N. W. Halverson, T. Hamada, M. Hasegawa, M. Hazumi, C. A. Hill, L. Howe, Y. Inoue, G. Jaehnig, O. Jeong, N. Katayama, B. Keating, R. Keskitalo, S. Kikuchi, T. Kisner, N. Krachmalnicoff, A. Kusaka, A. T. Lee, D. Leon, E. Linder, L. N. Lowry, A. Mangu, F. Matsuda, Y. Minami, M. Navaroli, H. Nishino, J. Peloton, A. T. P. Pham, D. Poletti, G. Puglisi, C. L. Reichardt, C. Ross, Y. Segawa, M. Silva-Feaver, P. Siritanasak, N. Stebor, R. Stompor, A. Suzuki, O. Tajima, S. Takakura, S. Takatori, D. Tanabe, G. P. Teply, T. Tomaru, C. Tsai, C. Verges, B. Westbrook, Y. Zhou

    Journal of Low Temperature Physics   199 ( 3-4 )   1137 - 1147   2020年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s10909-020-02366-w

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    その他リンク: http://link.springer.com/article/10.1007/s10909-020-02366-w/fulltext.html

  • Results of gravitational lensing and primordial gravitational waves from the POLARBEAR experiment

    Y Chinone, S Adachi, PAR Ade, M Aguilar, Y Akiba, K Arnold, C Baccigalupi, D Barron, D Beck, S Beckman, F Bianchini, D Boettger, J Borrill, H ElBouhargani, J Carron, S Chapman, K Cheung, K Crowley, A Cukierman, R Dünner, M Dobbs, A Ducout, T Elleflot, J Errard, G Fabbian, S M Feeney, C Feng, T Fujino, N Galitzki, A Gilbert, N Goeckner-Wald, J Groh, J C Groh, G Hall, N Halverson, T Hamada, M Hasegawa, M Hazumi, C A Hill, L Howe, Y Inoue, G Jaehnig, A H Jaffe, O Jeong, M LeJeune, D Kaneko, N Katayama, B Keating, R Keskitalo, S Kikuchi, T Kisner, N Krachmalnicoff, A Kusaka, A T Lee, E M Leitch, D Leon, E Linder, L N Lowry, A Mangu, F Matsuda, T Matsumura, Y Minami, J Montgomery, M Navaroli, H Nishino, H Paar, J Peloton, ATP Pham, D Poletti, G Puglisi, C L Reichardt, P L Richards, C Ross, Y Segawa, B D Sherwin, M Silva-Feaver, P Siritanasak, N Stebor, R Stompor, A Suzuki, O Tajima, S Takakura, S Takatori, D Tanabe, G P Teply, T Tomaru, C Tsai, C Tucker, C Verges, B Westbrook, N Whitehorn, A Zahn, Y Zhou

    Journal of Physics: Conference Series   1468 ( 1 )   012007 - 012007   2020年2月

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

    Abstract

    POLARBEAR is a Cosmic Microwave Background radiation (CMB) polarization experiment that is located in the Atacama Desert in Chile. The scientific goals of the experiment are to characterize the B-mode signal from gravitational lensing, as well as to search for B-mode signals created by primordial gravitational waves (PGWs). Polarbear started observations in 2012 and has published a series of results. These include the first measurement of a nonzero B-mode angular auto-power spectrum at sub-degree scales where the dominant signal is gravitational lensing of the CMB. In addition, we have achieved the first measurement of crosscorrelation between the lensing potential, which was reconstructed from the CMB polarization data alone by Polarbear, and the cosmic shear field from galaxy shapes by the Subaru Hyper Suprime-Cam (HSC) survey. In 2014, we installed a continuously rotating half-wave plate (CRHWP) at the focus of the primary mirror to search for PGWs and demonstrated the control of low-frequency noise. We have found that the low-frequency B-mode power in the combined dataset with the Planck high-frequency maps is consistent with Galactic dust foreground, thus placing an upper limit on the tensor-to-scalar ratio of r &lt; 0.90 at the 95% confidence level after marginalizing over the foregrounds.

    DOI: 10.1088/1742-6596/1468/1/012007

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    その他リンク: https://iopscience.iop.org/article/10.1088/1742-6596/1468/1/012007

  • Measurement of the Cosmic Microwave Background Polarization Lensing Power Spectrum from Two Years of POLARBEAR Data

    Mario Aguilar Faúndez, Kam Arnold, Carlo Baccigalupi, Darcy Barron, Dominic Beck, Shawn Beckman, Federico Bianchini, Julien Carron, Kolen Cheung, Yuji Chinone, Hamza El Bouhargani, Tucker Elleflot, Josquin Errard, Giulio Fabbian, Chang Feng, Takuro Fujino, Neil Goeckner-Wald, Takaho Hamada, Masaya Hasegawa, Masashi Hazumi, Charles A. Hill, Haruaki Hirose, Oliver Jeong, Nobuhiko Katayama, Brian Keating, Shuhei Kikuchi, Akito Kusaka, Adrian T. Lee, David Leon, Eric Linder, Lindsay Ng Lowry, Frederick Matsuda, Tomotake Matsumura, Yuto Minami, Martin Navaroli, Haruki Nishino, Anh Thi Phuong Pham, Davide Poletti, Giuseppe Puglisi, Christian L Reichardt, Yuuko Segawa, Blake D Sherwin, Maximiliano Silva-Feaver, Praween Siritanasak, Radek Stompor, Aritoki Suzuki, Osamu Tajima, Sayuri Takatori, Daiki Tanabe, Grant P. Teply, Calvin Tsai

    2019年11月

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    We present a measurement of the gravitational lensing deflection power
    spectrum reconstructed with two seasons cosmic microwave background
    polarization data from the POLARBEAR experiment. Observations were taken at 150
    GHz from 2012 to 2014 which survey three patches of sky totaling 30 square
    degrees. We test the consistency of the lensing spectrum with a Cold Dark
    Matter (CDM) cosmology and reject the no-lensing hypothesis at a confidence of
    10.9 sigma including statistical and systematic uncertainties. We observe a
    value of A_L = 1.33 +/- 0.32 (statistical) +/- 0.02 (systematic) +/- 0.07
    (foreground) using all polarization lensing estimators, which corresponds to a
    24% accurate measurement of the lensing amplitude. Compared to the analysis of
    the first year data, we have improved the breadth of both the suite of null
    tests and the error terms included in the estimation of systematic
    contamination.

    DOI: 10.3847/1538-4357/ab7e29

    arXiv

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    その他リンク: http://arxiv.org/pdf/1911.10980v2

  • A Measurement of the Degree Scale CMB B-mode Angular Power Spectrum with POLARBEAR

    S. Adachi, M. A. O. Aguilar Faúndez, K. Arnold, C. Baccigalupi, D. Barron, D. Beck, S. Beckman, F. Bianchini, D. Boettger, J. Borrill, J. Carron, S. Chapman, K. Cheung, Y. Chinone, K. Crowley, A. Cukierman, M. Dobbs, H. El Bouhargani, T. Elleflot, J. Errard, G. Fabbian, C. Feng, T. Fujino, N. Galitzki, N. Goeckner-Wald, J. Groh, G. Hall, N. Halverson, T. Hamada, M. Hasegawa, M. Hazumi, C. A. Hill, L. Howe, Y. Inoue, G. Jaehnig, O. Jeong, D. Kaneko, N. Katayama, B. Keating, R. Keskitalo, S. Kikuchi, T. Kisner, N. Krachmalnicoff, A. Kusaka, A. T. Lee, D. Leon, E. Linder, L. N. Lowry, A. Mangu, F. Matsuda, Y. Minami, M. Navaroli, H. Nishino, A. T. P. Pham, D. Poletti, G. Puglisi, C. L. Reichardt, Y. Segawa, M. Silva-Feaver, P. Siritanasak, N. Stebor, R. Stompor, A. Suzuki, O. Tajima, S. Takakura, S. Takatori, D. Tanabe, G. P. Teply, C. Tsai, C. Verges, B. Westbrook, Y. Zhou

    The Astrophysical Journal   897 ( 1 )   55 - 55   2019年10月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Astronomical Society  

    We present a measurement of the $B$-mode polarization power spectrum of the
    cosmic microwave background (CMB) using taken from July 2014 to December 2016
    with the POLARBEAR experiment. The CMB power spectra are measured using
    observations at 150 GHz with an instantaneous array sensitivity of
    $\mathrm{NET}_\mathrm{array}=23\, \mu \mathrm{K} \sqrt{\mathrm{s } }$ on a 670
    square degree patch of sky centered at (RA,
    Dec)=($+0^\mathrm{h}12^\mathrm{m}0^\mathrm{s},-59^\circ18^\prime$). A
    continuously rotating half-wave plate is used to modulate polarization and to
    suppress low-frequency noise. We achieve $32\,\mu\mathrm{K}$-$\mathrm{arcmin}$
    effective polarization map noise with a knee in sensitivity of $\ell = 90$,
    where the inflationary gravitational wave signal is expected to peak. The
    measured $B$-mode power spectrum is consistent with a $\Lambda$CDM lensing and
    single dust component foreground model over a range of multipoles $50 \leq \ell
    \leq 600$. The data disfavor zero $C_\ell^{BB}$ at $2.2\sigma$ using this
    $\ell$ range of POLARBEAR data alone. We cross-correlate our data with Planck
    high frequency maps and find the low-$\ell$ $B$-mode power in the combined
    dataset to be consistent with thermal dust emission. We place an upper limit on
    the tensor-to-scalar ratio $r < 0.90$ at 95% confidence level after
    marginalizing over foregrounds.

    DOI: 10.3847/1538-4357/ab8f24

    arXiv

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    その他リンク: http://arxiv.org/pdf/1910.02608v1

  • Internal delensing of Cosmic Microwave Background polarization B-modes with the POLARBEAR experiment

    S. Adachi, M. A. O. Aguilar Faúndez, Y. Akiba, A. Ali, K. Arnold, C. Baccigalupi, D. Barron, D. Beck, F. Bianchini, J. Borrill, J. Carron, K. Cheung, Y. Chinone, K. Crowley, H. El Bouhargani, T. Elleflot, J. Errard, G. Fabbian, C. Feng, T. Fujino, N. Goeckner-Wald, M. Hasegawa, M. Hazumi, C. A. Hill, L. Howe, N. Katayama, B. Keating, S. Kikuchi, A. Kusaka, A. T. Lee, D. Leon, E. Linder, L. N. Lowry, F. Matsuda, T. Matsumura, Y. Minami, T. Namikawa, M. Navaroli, H. Nishino, J. Peloton, A. T. P. Pham, D. Poletti, G. Puglisi, C. L. Reichardt, Y. Segawa, B. D. Sherwin, M. Silva-Feaver, P. Siritanasak, R. Stompor, O. Tajima, S. Takatori, D. Tanabe, G. P. Teply, C. Vergès

    2019年9月

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    Using only cosmic microwave background polarization data from the POLARBEAR
    experiment, we measure $B$-mode polarization delensing on subdegree scales at
    more than $5\sigma$ significance. We achieve a 14% $B$-mode power variance
    reduction, the highest to date for internal delensing, and improve this result
    to 2% by applying for the first time an iterative maximum a posteriori
    delensing method. Our analysis demonstrates the capability of internal
    delensing as a means of improving constraints on inflationary models, paving
    the way for the optimal analysis of next-generation primordial $B$-mode
    experiments.

    DOI: 10.1103/PhysRevLett.124.131301

    arXiv

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    その他リンク: http://arxiv.org/pdf/1909.13832v2

  • The POLARBEAR Fourier Transform Spectrometer Calibrator and Spectroscopic Characterization of the POLARBEAR Instrument

    Frederick Matsuda, Lindsay Lowry, Aritoki Suzuki, Mario Aguilar Faundez, Kam Arnold, Darcy Barron, Federico Bianchini, Kolen Cheung, Yuji Chinone, Tucker Elleflot, Giulio Fabbian, Neil Goeckner-Wald, Masaya Hasegawa, Daisuke Kaneko, Nobuhiko Katayama, Brian Keating, Adrian Lee, Martin Navaroli, Haruki Nishino, Hans Paar, Giuseppe Puglisi, Paul Richards, Joseph Seibert, Praween Siritanasak, Osamu Tajima, Sayuri Takatori, Calvin Tsai, Ben Westbrook

    2019年4月

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    We describe the Fourier Transform Spectrometer (FTS) used for in-field
    testing of the POLARBEAR receiver, an experiment located in the Atacama Desert
    of Chile which measures the cosmic microwave background (CMB) polarization. The
    POLARBEAR-FTS (PB-FTS) is a Martin-Puplett interferometer designed to couple to
    the Huan Tran Telescope (HTT) on which the POLARBEAR receiver is installed. The
    PB-FTS measured the spectral response of the POLARBEAR receiver with
    signal-to-noise ratio (SNR) $>20$ for $\sim$69% of the focal plane detectors
    due to three features: a high throughput of 15.1 steradian cm$^{2}$, optimized
    optical coupling to the POLARBEAR optics using a custom designed output
    parabolic mirror, and a continuously modulated output polarizer. The PB-FTS
    parabolic mirror is designed to mimic the shape of the 2.5 m-diameter HTT
    primary reflector which allows for optimum optical coupling to the POLARBEAR
    receiver, reducing aberrations and systematics. One polarizing grid is placed
    at the output of the PB-FTS, and modulated via continuous rotation. This
    modulation allows for decomposition of the signal into different harmonics that
    can be used to probe potentially pernicious sources of systematic error in a
    polarization-sensitive instrument. The high throughput and continuous output
    polarizer modulation features are unique compared to other FTS calibrators used
    in the CMB field. In-field characterization of the POLARBEAR receiver was
    accomplished using the PB-FTS in April 2014. We discuss the design,
    construction, and operation of the PB-FTS and present the spectral
    characterization of the POLARBEAR receiver. We introduce future applications
    for the PB-FTS in the next-generation CMB experiment, the Simons Array.

    DOI: 10.1063/1.5095160

    arXiv

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    その他リンク: http://arxiv.org/pdf/1904.02901v2

  • Evidence for the Cross-correlation between Cosmic Microwave Background Polarization Lensing from POLARBEAR and Cosmic Shear from Subaru Hyper Suprime-Cam

    Toshiya Namikawa, Yuji Chinone, Hironao Miyatake, Masamune Oguri, Ryuichi Takahashi, Akito Kusaka, Nobuhiko Katayama, Shunsuke Adachi, Mario Aguilar, Hiroaki Aihara, Aamir Ali, Robert Armstrong, Kam Arnold, Carlo Baccigalupi, Darcy Barron, Dominic Beck, Shawn Beckman, Federico Bianchini, David Boettger, Julian Borrill, Kolen Cheung, Lance Corbett, Kevin T. Crowley, Hamza El Bouhargani, Tucker Elleflot, Josquin Errard, Giulio Fabbian, Chang Feng, Nicholas Galitzki, Neil Goeckner-Wald, John Groh, Takaho Hamada, Masaya Hasegawa, Masashi Hazumi, Charles Hill, Logan Howe, Oliver Jeong, Daisuke Kaneko, Brian Keating, Adrian T. Lee, David Leon, Eric Linder, Lindsay Ng Lowry, Aashrita Mangu, Frederick Matsuda, Yuto Minami, Satoshi Miyazaki, Hitoshi Murayama, Martin Navaroli, Haruki Nishino, Atsushi J. Nishizawa, Anh Thi Phuong Pham, Davide Poletti, Giuseppe Puglisi, Christian L. Reichardt, Blake D. Sherwin, Maximiliano Silva-Feaver, Praween Siritanasak, Joshua S. Speagle, Radek Stompor, Aritoki Suzuki, Philip J. Tait, Osamu Tajima, Masahiro Takada, Satoru Takakura, Sayuri Takatori, Daiki Tanabe, Masayuki Tanaka, Grant P. Teply, Calvin Tsai, Clara Verges, Ben Westbrook, Yuyang Zhou, The POLARBEAR Collaboration, the Subaru HSC SSP Collaboration

    Astrophysical Journal   882 ( 1 )   2019年4月

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    掲載種別:研究論文(学術雑誌)  

    We present the first measurement of cross-correlation between the lensing
    potential, reconstructed from cosmic microwave background (CMB) {\it
    polarization} data, and the cosmic shear field from galaxy shapes. This
    measurement is made using data from the POLARBEAR CMB experiment and the Subaru
    Hyper Suprime-Cam (HSC) survey. By analyzing an 11~deg$^2$ overlapping region,
    we reject the null hypothesis at 3.5$\sigma$\ and constrain the amplitude of
    the {\bf cross-spectrum} to $\widehat{A}_{\rm lens}=1.70\pm 0.48$, where
    $\widehat{A}_{\rm lens}$ is the amplitude normalized with respect to the
    Planck~2018{} prediction, based on the flat $\Lambda$ cold dark matter
    cosmology. The first measurement of this {\bf cross-spectrum} without relying
    on CMB temperature measurements is possible due to the deep POLARBEAR map with
    a noise level of ${\sim}$6\,$\mu$K-arcmin, as well as the deep HSC data with a
    high galaxy number density of $n_g=23\,{\rm arcmin^{-2 } }$. We present a
    detailed study of the systematics budget to show that residual systematics in
    our results are negligibly small, which demonstrates the future potential of
    this cross-correlation technique.

    DOI: 10.3847/1538-4357/ab3424

    Scopus

    arXiv

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    その他リンク: http://arxiv.org/pdf/1904.02116v2

  • Cross-correlation of POLARBEAR CMB Polarization Lensing with High-$z$ Sub-mm Herschel-ATLAS galaxies

    M. Aguilar Faundez, K. Arnold, C. Baccigalupi, D. Barron, D. Beck, F. Bianchini, D. Boettger, J. Borrill, J. Carron, K. Cheung, Y. Chinone, H. El Bouhargani, T. Elleflot, J. Errard, G. Fabbian, C. Feng, N. Galitzki, N. Goeckner-Wald, M. Hasegawa, M. Hazumi, L. Howe, D. Kaneko, N. Katayama, B. Keating, N. Krachmalnicoff, A. Kusaka, A. T. Lee, D. Leon, E. Linder, L. N. Lowry, F. Matsuda, Y. Minami, M. Navaroli, H. Nishino, A. T. P. Pham, D. Poletti, G. Puglisi, C. L. Reichardt, B. D. Sherwin, M. Silva-Feaver, R. Stompor, A. Suzuki, O. Tajima, S. Takakura, S. Takatori, G. P. Teply, C. Tsai, C. Verges

    The Astrophysical Journal   886 ( 1 )   38 - 38   2019年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Astronomical Society  

    We report a 4.8$\sigma$ measurement of the cross-correlation signal between
    the cosmic microwave background (CMB) lensing convergence reconstructed from
    measurements of the CMB polarization made by the POLARBEAR experiment and the
    infrared-selected galaxies of the Herschel-ATLAS survey. This is the first
    measurement of its kind. We infer a best-fit galaxy bias of $b = 5.76 \pm
    1.25$, corresponding to a host halo mass of $\log_{10}(M_h/M_\odot)
    =13.5^{+0.2}_{-0.3}$ at an effective redshift of $z \sim 2$ from the
    cross-correlation power spectrum. Residual uncertainties in the redshift
    distribution of the sub-mm galaxies are subdominant with respect to the
    statistical precision. We perform a suite of systematic tests, finding that
    instrumental and astrophysical contaminations are small compared to the
    statistical error. This cross-correlation measurement only relies on CMB
    polarization information that, differently from CMB temperature maps, is less
    contaminated by galactic and extra-galactic foregrounds, providing a clearer
    view of the projected matter distribution. This result demonstrates the
    feasibility and robustness of this approach for future high-sensitivity CMB
    polarization experiments.

    DOI: 10.3847/1538-4357/ab4a78

    arXiv

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    その他リンク: http://arxiv.org/pdf/1903.07046v3

  • LiteBIRD: A Satellite for the Studies of B-Mode Polarization and Inflation from Cosmic Background Radiation Detection

    M. Hazumi, P. A. R. Ade, Y. Akiba, D. Alonso, K. Arnold, J. Aumont, C. Baccigalupi, D. Barron, S. Basak, S. Beckman, J. Borrill, F. Boulanger, M. Bucher, E. Calabrese, Y. Chinone, S. Cho, A. Cukierman, D. W. Curtis, T. de Haan, M. Dobbs, A. Dominjon, T. Dotani, L. Duband, A. Ducout, J. Dunkley, J. M. Duval, T. Elleflot, H. K. Eriksen, J. Errard, J. Fischer, T. Fujino, T. Funaki, U. Fuskeland, K. Ganga, N. Goeckner-Wald, J. Grain, N. W. Halverson, T. Hamada, T. Hasebe, M. Hasegawa, K. Hattori, M. Hattori, L. Hayes, N. Hidehira, C. A. Hill, G. Hilton, J. Hubmayr, K. Ichiki, T. Iida, H. Imada, M. Inoue, Y. Inoue, K. D. Irwin, H. Ishino, O. Jeong, H. Kanai, D. Kaneko, S. Kashima, N. Katayama, T. Kawasaki, S. A. Kernasovskiy, R. Keskitalo, A. Kibayashi, Y. Kida, K. Kimura, T. Kisner, K. Kohri, E. Komatsu, K. Komatsu, C. L. Kuo, N. A. Kurinsky, A. Kusaka, A. Lazarian, A. T. Lee, D. Li, E. Linder, B. Maffei, A. Mangilli, M. Maki, T. Matsumura, S. Matsuura, D. Meilhan, S. Mima, Y. Minami, K. Mitsuda, L. Montier, M. Nagai, T. Nagasaki, R. Nagata, M. Nakajima, S. Nakamura, T. Namikawa, M. Naruse, H. Nishino, T. Nitta, T. Noguchi, H. Ogawa, S. Oguri, N. Okada, A. Okamoto, T. Okamura, C. Otani, G. Patanchon, G. Pisano, G. Rebeiz, M. Remazeilles, P. L. Richards, S. Sakai, Y. Sakurai, Y. Sato, N. Sato, M. Sawada, Y. Segawa, Y. Sekimoto, U. Seljak, B. D. Sherwin, T. Shimizu, K. Shinozaki, R. Stompor, H. Sugai, H. Sugita, A. Suzuki, J. Suzuki, O. Tajima, S. Takada, R. Takaku, S. Takakura, S. Takatori, D. Tanabe, E. Taylor, K. L. Thompson, B. Thorne, T. Tomaru, T. Tomida, N. Tomita, M. Tristram, C. Tucker, P. Turin, M. Tsujimoto, S. Uozumi, S. Utsunomiya, Y. Uzawa, F. Vansyngel, I. K. Wehus, B. Westbrook, M. Willer, N. Whitehorn, Y. Yamada, R. Yamamoto, N. Yamasaki, T. Yamashita, M. Yoshida

    Journal of Low Temperature Physics   194 ( 5-6 )   443 - 452   2019年3月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    LiteBIRD is a candidate satellite for a strategic large mission of JAXA. With its expected launch in the middle of the 2020s with a H3 rocket, LiteBIRD plans to map the polarization of the cosmic microwave background radiation over the full sky with unprecedented precision. The full success of LiteBIRD is to achieve δr< 0.001 , where δr is the total error on the tensor-to-scalar ratio r. The required angular coverage corresponds to 2 ≤ ℓ≤ 200 , where ℓ is the multipole moment. This allows us to test well-motivated cosmic inflation models. Full-sky surveys for 3 years at a Lagrangian point L2 will be carried out for 15 frequency bands between 34 and 448 GHz with two telescopes to achieve the total sensitivity of 2.5 μ K arcmin with a typical angular resolution of 0.5 ∘ at 150 GHz. Each telescope is equipped with a half-wave plate system for polarization signal modulation and a focal plane filled with polarization-sensitive TES bolometers. A cryogenic system provides a 100 mK base temperature for the focal planes and 2 K and 5 K stages for optical components.

    DOI: 10.1007/s10909-019-02150-5

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    その他リンク: http://link.springer.com/content/pdf/10.1007/s10909-019-02150-5.pdf

  • The POLARBEAR-2 and Simons Array Focal Plane Fabrication Status

    B. Westbrook, P. A. R. Ade, M. Aguilar, Y. Akiba, K. Arnold, C. Baccigalupi, D. Barron, D. Beck, S. Beckman, A. N. Bender, F. Bianchini, D. Boettger, J. Borrill, S. Chapman, Y. Chinone, G. Coppi, K. Crowley, A. Cukierman, T. de Haan, R. Dünner, M. Dobbs, T. Elleflot, J. Errard, G. Fabbian, S. M. Feeney, C. Feng, G. Fuller, N. Galitzki, A. Gilbert, N. Goeckner-Wald, J. Groh, N. W. Halverson, T. Hamada, M. Hasegawa, M. Hazumi, C. A. Hill, W. Holzapfel, L. Howe, Y. Inoue, G. Jaehnig, A. Jaffe, O. Jeong, D. Kaneko, N. Katayama, B. Keating, R. Keskitalo, T. Kisner, N. Krachmalnicoff, A. Kusaka, M. Le Jeune, A. T. Lee, D. Leon, E. Linder, L. Lowry, A. Madurowicz, D. Mak, F. Matsuda, A. May, N. J. Miller, Y. Minami, J. Montgomery, M. Navaroli, H. Nishino, J. Peloton, A. Pham, L. Piccirillo, D. Plambeck, D. Poletti, G. Puglisi, C. Raum, G. Rebeiz, C. L. Reichardt, P. L. Richards, H. Roberts, C. Ross, K. M. Rotermund, Y. Segawa, B. Sherwin, M. Silva-Feaver, P. Siritanasak, R. Stompor, A. Suzuki, O. Tajima, S. Takakura, S. Takatori, D. Tanabe, R. Tat, G. P. Teply, A. Tikhomirov, T. Tomaru, C. Tsai, N. Whitehorn, A. Zahn

    Journal of Low Temperature Physics   193 ( 5-6 )   758 - 770   2018年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    DOI: 10.1007/s10909-018-2059-0

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  • Concept Study of Optical Configurations for High-Frequency Telescope for LiteBIRD

    T. Hasebe, S. Kashima, P. A. R. Ade, Y. Akiba, D. Alonso, K. Arnold, J. Aumont, C. Baccigalupi, D. Barron, S. Basak, S. Beckman, J. Borrill, F. Boulanger, M. Bucher, E. Calabrese, Y. Chinone, H.-M. Cho, A. Cukierman, D. W. Curtis, T. de Haan, M. Dobbs, A. Dominjon, T. Dotani, L. Duband, A. Ducout, J. Dunkley, J. M. Duval, T. Elleflot, H. K. Eriksen, J. Errard, J. Fischer, T. Fujino, T. Funaki, U. Fuskeland, K. Ganga, N. Goeckner-Wald, J. Grain, N. W. Halverson, T. Hamada, M. Hasegawa, K. Hattori, M. Hattori, L. Hayes, M. Hazumi, N. Hidehira, C. A. Hill, G. Hilton, J. Hubmayr, K. Ichiki, T. Iida, H. Imada, M. Inoue, Y. Inoue, K. D. Irwin, H. Ishino, O. Jeong, H. Kanai, D. Kaneko, N. Katayama, T. Kawasaki, S. A. Kernasovskiy, R. Keskitalo, A. Kibayashi, Y. Kida, K. Kimura, T. Kisner, K. Kohri, E. Komatsu, K. Komatsu, C. L. Kuo, N. A. Kurinsky, A. Kusaka, A. Lazarian, A. T. Lee, D. Li, E. Linder, B. Maffei, A. Mangilli, M. Maki, T. Matsumura, S. Matsuura, D. Meilhan, S. Mima, Y. Minami, K. Mitsuda, L. Montier, M. Nagai, T. Nagasaki, R. Nagata, M. Nakajima, S. Nakamura, T. Namikawa, M. Naruse, H. Nishino, T. Nitta, T. Noguchi, H. Ogawa, S. Oguri, N. Okada, A. Okamoto, T. Okamura, C. Otani, G. Patanchon, G. Pisano, G. Rebeiz, M. Remazeilles, P. L. Richards, S. Sakai, Y. Sakurai, Y. Sato, N. Sato, M. Sawada, Y. Segawa, Y. Sekimoto, U. Seljak, B. D. Sherwin, T. Shimizu, K. Shinozaki, R. Stompor, H. Sugai, H. Sugita, A. Suzuki, J. Suzuki, O. Tajima, S. Takada, R. Takaku, S. Takakura, S. Takatori, D. Tanabe, E. Taylor, K. L. Thompson, B. Thorne, T. Tomaru, T. Tomida, N. Tomita, M. Tristram, C. Tucker, P. Turin, M. Tsujimoto, S. Uozumi, S. Utsunomiya, Y. Uzawa, F. Vansyngel, I. K. Wehus, B. Westbrook, M. Willer, N. Whitehorn, Y. Yamada, R. Yamamoto, N. Yamasaki, T. Yamashita, M. Yoshida

    Journal of Low Temperature Physics   193 ( 5-6 )   841 - 850   2018年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

    The high-frequency telescope for LiteBIRD is designed with refractive and reflective optics. In order to improve sensitivity, this paper suggests the new optical configurations of the HFT which have approximately 7 times larger focal planes than that of the original design. The sensitivities of both the designs are compared, and the requirement of anti-reflection (AR) coating on the lens for the refractive option is derived. We also present the simulation result of a sub-wavelength AR structure on both surfaces of silicon, which shows a band-averaged reflection of 1.1–3.2% at 101–448 GHz.

    DOI: 10.1007/s10909-018-1915-2

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  • Measurements of tropospheric ice clouds with a ground-based CMB polarization experiment, POLARBEAR

    Satoru Takakura, Mario A. O. Aguilar-Faúndez, Yoshiki Akiba, Kam Arnold, Carlo Baccigalupi, Darcy Barron, Dominic Beck, Federico Bianchini, David Boettger, Julian Borrill, Kolen Cheung, Yuji Chinone, Tucker Elleflot, Josquin Errard, Giulio Fabbian, Chang Feng, Neil Goeckner-Wald, Takaho Hamada, Masaya Hasegawa, Masashi Hazumi, Logan Howe, Daisuke Kaneko, Nobuhiko Katayama, Brian Keating, Reijo Keskitalo, Theodore Kisner, Nicoletta Krachmalnicoff, Akito Kusaka, Adrian T. Lee, Lindsay N. Lowry, Frederick T. Matsuda, Andrew J. May, Yuto Minami, Martin Navaroli, Haruki Nishino, Lucio Piccirillo, Davide Poletti, Giuseppe Puglisi, Christian L. Reichardt, Yuuko Segawa, Maximiliano Silva-Feaver, Praween Siritanasak, Aritoki Suzuki, Osamu Tajima, Sayuri Takatori, Daiki Tanabe, Grant P. Teply, Calvin Tsai

    2018年9月

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    The polarization of the atmosphere has been a long-standing concern for
    ground-based experiments targeting cosmic microwave background (CMB)
    polarization. Ice crystals in upper tropospheric clouds scatter thermal
    radiation from the ground and produce a horizontally-polarized signal. We
    report the detailed analysis of the cloud signal using a ground-based CMB
    experiment, POLARBEAR, located at the Atacama desert in Chile and observing at
    150 GHz. We observe horizontally-polarized temporal increases of low-frequency
    fluctuations ("polarized bursts," hereafter) of $\lesssim$0.1 K when clouds
    appear in a webcam monitoring the telescope and the sky. The hypothesis of no
    correlation between polarized bursts and clouds is rejected with $>$24$\sigma$
    statistical significance using three years of data. We consider many other
    possibilities including instrumental and environmental effects, and find no
    other reasons other than clouds that can explain the data better. We also
    discuss the impact of the cloud polarization on future ground-based CMB
    polarization experiments.

    DOI: 10.3847/1538-4357/aaf381

    arXiv

    researchmap

    その他リンク: http://arxiv.org/pdf/1809.06556v1

  • The LiteBIRD Satellite Mission - Sub-Kelvin Instrument

    A. Suzuki, P. A. R. Ade, Y. Akiba, D. Alonso, K. Arnold, J. Aumont, C. Baccigalupi, D. Barron, S. Basak, S. Beckman, J. Borrill, F. Boulanger, M. Bucher, E. Calabrese, Y. Chinone, H-M. Cho, A. Cukierman, D. W. Curtis, T. de Haan, M. Dobbs, A. Dominjon, T. Dotani, L. Duband, A. Ducout, J. Dunkley, J. M. Duval, T. Elleflot, H. K. Eriksen, J. Errard, J. Fischer, T. Fujino, T. Funaki, U. Fuskeland, K. Ganga, N. Goeckner-Wald, J. Grain, N. W. Halverson, T. Hamada, T. Hasebe, M. Hasegawa, K. Hattori, M. Hattori, L. Hayes, M. Hazumi, N. Hidehira, C. A. Hill, G. Hilton, J. Hubmayr, K. Ichiki, T. Iida, H. Imada, M. Inoue, Y. Inoue, K. D., H. Ishino, O. Jeong, H. Kanai, D. Kaneko, S. Kashima, N. Katayama, T. Kawasaki, S. A. Kernasovskiy, R. Keskitalo, A. Kibayashi, Y. Kida, K. Kimura, T. Kisner, K. Kohri, E. Komatsu, K. Komatsu, C. L. Kuo, N. A. Kurinsky, A. Kusaka, A. Lazarian, A. T. Lee, D. Li, E. Linder, B. Maffei, A. Mangilli, M. Maki, T. Matsumura, S. Matsuura, D. Meilhan, S. Mima, Y. Minami, K. Mitsuda, L. Montier, M. Nagai, T. Nagasaki, R. Nagata, M. Nakajima, S. Nakamura, T. Namikawa, M. Naruse, H. Nishino, T. Nitta, T. Noguchi, H. Ogawa, S. Oguri, N. Okada, A. Okamoto, T. Okamura, C. Otani, G. Patanchon, G. Pisano, G. Rebeiz, M. Remazeilles, P. L. Richards, S. Sakai, Y. Sakurai, Y. Sato, N. Sato, M. Sawada, Y. Segawa, Y. Sekimoto, U. Seljak, B. D. Sherwin, T. Shimizu, K. Shinozaki, R. Stompor, H. Sugai, H. Sugita, J. Suzuki, O. Tajima, S. Takada, R. Takaku, S. Takakura, S. Takatori, D. Tanabe, E. Taylor, K. L. Thompson, B. Thorne, T. Tomaru, T. Tomida, N. Tomita, M. Tristram, C. Tucker, P. Turin, M. Tsujimoto, S. Uozumi, S. Utsunomiya, Y. Uzawa, F. Vansyngel, I. K. Wehus, B. Westbrook, M. Willer, N. Whitehorn, Y. Yamada, R. Yamamoto, N. Yamasaki, T. Yamashita, M. Yoshida

    Journal of Low Temperature Physics   193 ( 5-6 )   1048 - 1056   2018年1月

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    掲載種別:研究論文(学術雑誌)  

    Inflation is the leading theory of the first instant of the universe.
    Inflation, which postulates that the universe underwent a period of rapid
    expansion an instant after its birth, provides convincing explanation for
    cosmological observations. Recent advancements in detector technology have
    opened opportunities to explore primordial gravitational waves generated by the
    inflation through B-mode (divergent-free) polarization pattern embedded in the
    Cosmic Microwave Background anisotropies. If detected, these signals would
    provide strong evidence for inflation, point to the correct model for
    inflation, and open a window to physics at ultra-high energies.
    LiteBIRD is a satellite mission with a goal of detecting
    degree-and-larger-angular-scale B-mode polarization. LiteBIRD will observe at
    the second Lagrange point with a 400 mm diameter telescope and 2,622 detectors.
    It will survey the entire sky with 15 frequency bands from 40 to 400 GHz to
    measure and subtract foregrounds.
    The U.S. LiteBIRD team is proposing to deliver sub-Kelvin instruments that
    include detectors and readout electronics. A lenslet-coupled sinuous antenna
    array will cover low-frequency bands (40 GHz to 235 GHz) with four frequency
    arrangements of trichroic pixels. An orthomode-transducer-coupled corrugated
    horn array will cover high-frequency bands (280 GHz to 402 GHz) with three
    types of single frequency detectors. The detectors will be made with Transition
    Edge Sensor (TES) bolometers cooled to a 100 milli-Kelvin base temperature by
    an adiabatic demagnetization refrigerator.The TES bolometers will be read out
    using digital frequency multiplexing with Superconducting QUantum Interference
    Device (SQUID) amplifiers. Up to 78 bolometers will be multiplexed with a
    single SQUID amplidier.
    We report on the sub-Kelvin instrument design and ongoing developments for
    the LiteBIRD mission.

    DOI: 10.1007/s10909-018-1947-7

    Scopus

    arXiv

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    その他リンク: http://arxiv.org/pdf/1801.06987v3

  • A Measurement of the Cosmic Microwave Background $B$-Mode Polarization Power Spectrum at Sub-Degree Scales from 2 years of POLARBEAR Data

    The POLARBEAR Collaboration, P. A. R. Ade, M. Aguilar, Y. Akiba, K. Arnold, C. Baccigalupi, D. Barron, D. Beck, F. Bianchini, D. Boettger, J. Borrill, S. Chapman, Y. Chinone, K. Crowley, A. Cukierman, M. Dobbs, A. Ducout, R. Dünner, T. Elleflot, J. Errard, G. Fabbian, S. M. Feeney, C. Feng, T. Fujino, N. Galitzki, A. Gilbert, N. Goeckner-Wald, J. Groh, T. Hamada, G. Hall, N. W. Halverson, M. Hasegawa, M. Hazumi, C. Hill, L. Howe, Y. Inoue, G. C. Jaehnig, A. H. Jaffe, O. Jeong, D. Kaneko, N. Katayama, B. Keating, R. Keskitalo, T. Kisner, N. Krachmalnicoff, A. Kusaka, M. Le Jeune, A. T. Lee, E. M. Leitch, D. Leon, E. Linder, L. Lowry, F. Matsuda, T. Matsumura, Y. Minami, J. Montgomery, M. Navaroli, H. Nishino, H. Paar, J. Peloton, A. T. P. Pham, D. Poletti, G. Puglisi, C. L. Reichardt, P. L. Richards, C. Ross, Y. Segawa, B. D. Sherwin, M. Silva-Feaver, P. Siritanasak, N. Stebor, R. Stompor, A. Suzuki, O. Tajima, S. Takakura, S. Takatori, D. Tanabe, G. P. Teply, T. Tomaru, C. Tucker, N. Whitehorn, A. Zahn

    The Astrophysical Journal   848 ( 2 )   121 - 121   2017年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Astronomical Society  

    We report an improved measurement of the cosmic microwave background (CMB)
    $B$-mode polarization power spectrum with the POLARBEAR experiment at 150 GHz.
    By adding new data collected during the second season of observations
    (2013-2014) to re-analyzed data from the first season (2012-2013), we have
    reduced twofold the band-power uncertainties. The band powers are reported over
    angular multipoles $500 \leq \ell \leq 2100$, where the dominant $B$-mode
    signal is expected to be due to the gravitational lensing of $E$-modes. We
    reject the null hypothesis of no $B$-mode polarization at a confidence of
    3.1$\sigma$ including both statistical and systematic uncertainties. We test
    the consistency of the measured $B$-modes with the $\Lambda$ Cold Dark Matter
    ($\Lambda$CDM) framework by fitting for a single lensing amplitude parameter
    $A_L$ relative to the Planck best-fit model prediction. We obtain $A_L = 0.60
    ^{+0.26} _{-0.24} ({\rm stat}) ^{+0.00} _{-0.04}({\rm inst}) \pm 0.14 ({\rm
    foreground}) \pm 0.04 ({\rm multi})$, where $A_{L}=1$ is the fiducial
    $\Lambda$CDM value, and the details of the reported uncertainties are explained
    later in the manuscript.

    DOI: 10.3847/1538-4357/aa8e9f

    arXiv

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    その他リンク: http://arxiv.org/pdf/1705.02907v2

  • Performance of a continuously rotating half-wave plate on the POLARBEAR telescope

    Satoru Takakura, Mario Aguilar, Yoshiki Akiba, Kam Arnold, Carlo Baccigalupi, Darcy Barron, Shawn Beckman, David Boettger, Julian Borrill, Scott Chapman, Yuji Chinone, Ari Cukierman, Anne Ducout, Tucker Elleflot, Josquin Errard, Giulio Fabbian, Takuro Fujino, Nicholas Galitzki, Neil Goeckner-Wald, Nils W. Halverson, Masaya Hasegawa, Kaori Hattori, Masashi Hazumi, Charles Hill, Logan Howe, Yuki Inoue, Andrew H. Jaffe, Oliver Jeong, Daisuke Kaneko, Nobuhiko Katayama, Brian Keating, Reijo Keskitalo, Theodore Kisner, Nicoletta Krachmalnicoff, Akito Kusaka, Adrian T. Lee, David Leon, Lindsay Lowry, Frederick Matsuda, Tomotake Matsumura, Martin Navaroli, Haruki Nishino, Hans Paar, Julien Peloton, Davide Poletti, Giuseppe Puglisi, Christian L. Reichardt, Colin Ross, Praween Siritanasak, Aritoki Suzuki, Osamu Tajima, Sayuri Takatori, Grant Teply

    2017年2月

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    A continuously rotating half-wave plate (CRHWP) is a promising tool to
    improve the sensitivity to large angular scales in cosmic microwave background
    (CMB) polarization measurements. With a CRHWP, single detectors can measure
    three of the Stokes parameters, $I$, $Q$ and $U$, thereby avoiding the set of
    systematic errors that can be introduced by mismatches in the properties of
    orthogonal detector pairs. We focus on the implementation of CRHWPs in large
    aperture telescopes (i.e. the primary mirror is larger than the current maximum
    half-wave plate diameter of $\sim$0.5 m), where the CRHWP can be placed between
    the primary mirror and focal plane. In this configuration, one needs to address
    the intensity to polarization ($I{\rightarrow}P$) leakage of the optics, which
    becomes a source of 1/f noise and also causes differential gain systematics
    that arise from CMB temperature fluctuations. In this paper, we present the
    performance of a CRHWP installed in the POLARBEAR experiment, which employs a
    Gregorian telescope with a 2.5 m primary illumination pattern. The CRHWP is
    placed near the prime focus between the primary and secondary mirrors. We find
    that the $I{\rightarrow}P$ leakage is larger than the expectation from the
    physical properties of our primary mirror, resulting in a 1/f knee of 100 mHz.
    The excess leakage could be due to imperfections in the detector system, i.e.
    detector non-linearity in the responsivity and time-constant. We demonstrate,
    however, that by subtracting the leakage correlated with the intensity signal,
    the 1/f noise knee frequency is reduced to 32 mHz ($\ell \sim$39 for our scan
    strategy), which is very promising to probe the primordial B-mode signal. We
    also discuss methods for further noise subtraction in future projects where the
    precise temperature control of instrumental components and the leakage
    reduction will play a key role.

    DOI: 10.1088/1475-7516/2017/05/008

    arXiv

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    その他リンク: http://arxiv.org/pdf/1702.07111v2

  • POLARBEAR-2: an instrument for CMB polarization measurements

    Y. Inoue, P. Ade, Y. Akiba, C. Aleman, K. Arnold, C. Baccigalupi, B. Barch, D. Barron, A. Bender, D. Boettger, J. Borrill, S. Chapman, Y. Chinone, A. Cukierman, T. de Haan, M. A. Dobbs, A. Ducout, R. Dunner, T. Elleflot, J. Errard, G. Fabbian, S. Feeney, C. Feng, G. Fuller, A. J. Gilbert, N. Goeckner-Wald, J. Groh, G. Hall, N. Halverson, T. Hamada, M. Hasegawa, K. Hattori, M. Hazumi, C. Hill, W. L. Holzapfel, Y. Hori, L. Howe, F. Irie, G. Jaehnig, A. Jaffe, O. Jeongh, N. Katayama, J. P. Kaufman, K. Kazemzadeh, B. G. Keating, Z. Kermish, R. Keskital, T. Kisner, A. Kusaka, M. Le Jeune, A. T. Lee, D. Leon, E. V. Linder, L. Lowry, F. Matsuda, T. Matsumura, N. Miller, K. Mizukami, J. Montgomery, M. Navaroli, H. Nishino, H. Paar, J. Peloton, D. Poletti, G. Puglisi, C. R. Raum, G. M. Rebeiz, C. L. Reichardt, P. L. Richards, C. Ross, K. M. Rotermund, Y. Segaw, B. D. Sherwin, I. Shirley, P. Siritanasak, N. Stebor, R. Stompor A. Suzuki, O. Tajima, S. Takada, S. Takatori, G. P. Teply, A. Tikhomirol, T. Tomaru, N. Whitehorn, A. Zahn, O. Zahn

    Proceedings of SPIE - The International Society for Optical Engineering   9914   2016年8月

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    掲載種別:研究論文(国際会議プロシーディングス)  

    POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization
    experiment that will be located in the Atacama highland in Chile at an altitude
    of 5200 m. Its science goals are to measure the CMB polarization signals
    originating from both primordial gravitational waves and weak lensing. PB-2 is
    designed to measure the tensor to scalar ratio, r, with precision {\sigma}(r) <
    0.01, and the sum of neutrino masses, {\Sigma}m{\nu}, with
    {\sigma}({\Sigma}m{\nu}) < 90 meV. To achieve these goals, PB-2 will employ
    7588 transition-edge sensor bolometers at 95 GHz and 150 GHz, which will be
    operated at the base temperature of 250 mK. Science observations will begin in
    2017.

    DOI: 10.1117/12.2231961

    Scopus

    arXiv

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    その他リンク: http://arxiv.org/pdf/1608.03025v1

  • The Simons Array CMB polarization experiment

    N. Stebor, P. Ade, Y. Akiba, C. Aleman, K. Arnold, C. Baccigalupi, B. Barch, D. Barron, S. Beckman, A. Bender, D. Boettger, J. Borrill, S. Chapman, Y. Chinone, A. Cukierman, T. de Haan, M. Dobbs, A. Ducout, R. Dunner, T. Elleflot, J. Errard, G. Fabbian, S. Feeney, C. Feng, T. Fujino, G. Fuller, A. J. Gilbert, N. Goeckner-Wald, J. Groh, G. Hall, N. Halverson, T. Hamada, M. Hasegawa, K. Hattori, M. Hazumi, C. Hill, W. L. Holzapfel, Y. Hori, L. Howe, Y. Inoue, F. Irie, G. Jaehnig, A. Jaffe, O. Jeong, N. Katayama, J. P. Kaufman, K. Kazemzadeh, B. G. Keating, Z. Kermish, R. Keskitalo, T. Kisner, A. Kusaka, M. Le Jeune, A. T. Lee, D. Leon, E. V. Linder, L. Lowry, F. Matsuda, T. Matsumura, N. Miller, J. Montgomery, M. Navaroli, H. Nishino, H. Paar, J. Peloton, D. Poletti, G. Puglisi, C. R. Raum, G. M. Rebeiz, C. L. Reichardt, P. L. Richards, C. Ross, K. M. Rotermund, Y. Segawa, B. D. Sherwin, I. Shirley, P. Siritanasak, L. Steinmetz, R. Stompor, A. Suzuki, O. Tajima, S. Takada, S. Takatori, G. P. Teply, A. Tikhomirov, T. Tomaru, B. Westbrook, N. Whitehorn, A. Zahn, O. Zahn

    SPIE Proceedings   9914   2016年7月

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    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:SPIE  

    The Simons Array is a next generation cosmic microwave background (CMB) polarization experiment whose science target is a precision measurement of the B-mode polarization pattern produced both by inflation and by gravitational lensing. As a continuation and extension of the successful POLARBEAR experimental program, the Simons Array will consist of three cryogenic receivers each featuring multichroic bolometer arrays mounted onto separate 3.5m telescopes. The first of these, also called POLARBEAR-2A, will be the first to deploy in late 2016 and has a large diameter focal plane consisting of dual-polarization dichroic pixels sensitive at 95 GHz and 150 GHz. The POLARBEAR-2A focal plane will utilize 7,588 antenna-coupled superconducting transition edge sensor (TES) bolometers read out with SQUID amplifiers using frequency domain multiplexing techniques. The next two receivers that will make up the Simons Array will be nearly identical in overall design but will feature extended frequency capability. The combination of high sensitivity, multichroic frequency coverage and large sky area available from our mid-latitude Chilean observatory will allow Simons Array to produce high quality polarization sky maps over a wide range of angular scales and to separate out the CMB B-modes from other astrophysical sources with high fidelity. After accounting for galactic foreground separation, the Simons Array will detect the primordial gravitational wave B-mode signal to r > 0.01 with a significance of > 5σ and will constrain the sum of neutrino masses to 40 meV (1σ) when cross-correlated with galaxy surveys. We present the current status of this funded experiment, its future, and discuss its projected science return.

    DOI: 10.1117/12.2233103

    Scopus

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  • The POLARBEAR-2 and the Simons Array Experiment

    A. Suzuki, P. Ade, Y. Akiba, C. Aleman, K. Arnold, C. Baccigalupi, B. Barch, D. Barron, A. Bender, D. Boettger, J. Borrill, S. Chapman, Y. Chinone, A. Cukierman, M. Dobbs, A. Ducout, R. Dunner, T. Elleflot, J. Errard, G. Fabbian, S. Feeney, C. Feng, T. Fujino, G. Fuller, A. Gilbert, N. Goeckner-Wald, J. Groh, T. De Haan, G. Hall, N. Halverson, T. Hamada, M. Hasegawa, K. Hattori, M. Hazumi, C. Hill, W. Holzapfel, Y. Hori, L. Howe, Y. Inoue, F. Irie, G. Jaehnig, A. Jaffe, O. Jeong, N. Katayama, J. Kaufman, K. Kazemzadeh, B. Keating, Z. Kermish, R. Keskitalo, T. Kisner, A. Kusaka, M. Le Jeune, A. Lee, D. Leon, E. Linder, L. Lowry, F. Matsuda, T. Matsumura, N. Miller, K. Mizukami, J. Montgomery, M. Navaroli, H. Nishino, J. Peloton, D. Poletti, G. Rebeiz, C. Raum, C. Reichardt, P. Richards, C. Ross, K. Rotermund, Y. Segawa, B. Sherwin, I. Shirley, P. Siritanasak, N. Stebor, R. Stompor, J. Suzuki, O. Tajima, S. Takada, S. Takakura, S. Takatori, A. Tikhomirov, T. Tomaru, B. Westbrook, N. Whitehorn, T. Yamashita, A. Zahn, O. Zahn

    Journal of Low Temperature Physics   184 ( 3-4 )   805 - 810   2015年12月

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    掲載種別:研究論文(学術雑誌)  

    We present an overview of the design and status of the \Pb-2 and the Simons
    Array experiments. \Pb-2 is a Cosmic Microwave Background polarimetry
    experiment which aims to characterize the arc-minute angular scale B-mode
    signal from weak gravitational lensing and search for the degree angular scale
    B-mode signal from inflationary gravitational waves. The receiver has a 365~mm
    diameter focal plane cooled to 270~milli-Kelvin. The focal plane is filled with
    7,588 dichroic lenslet-antenna coupled polarization sensitive Transition Edge
    Sensor (TES) bolometric pixels that are sensitive to 95~GHz and 150~GHz bands
    simultaneously. The TES bolometers are read-out by SQUIDs with 40 channel
    frequency domain multiplexing. Refractive optical elements are made with high
    purity alumina to achieve high optical throughput. The receiver is designed to
    achieve noise equivalent temperature of 5.8~$\mu$K$_{CMB}\sqrt{s}$ in each
    frequency band. \Pb-2 will deploy in 2016 in the Atacama desert in Chile. The
    Simons Array is a project to further increase sensitivity by deploying three
    \Pb-2 type receivers. The Simons Array will cover 95~GHz, 150~GHz and 220~GHz
    frequency bands for foreground control. The Simons Array will be able to
    constrain tensor-to-scalar ratio and sum of neutrino masses to $\sigma(r) =
    6\times 10^{-3}$ at $r = 0.1$ and $\sum m_\nu (\sigma =1)$ to 40 meV.

    DOI: 10.1007/s10909-015-1425-4

    Scopus

    arXiv

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    その他リンク: http://arxiv.org/pdf/1512.07299v1

▼全件表示

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    研究課題/領域番号:23K13125  2023年04月 - 2025年03月

    日本学術振興会  科学研究費助成事業  若手研究

    高取 沙悠理

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    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

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  • トリウム229アイソマーからの脱励起光直接観測実現へ向けた超伝導転移端センサの開発

    研究課題/領域番号:22K20371  2022年08月 - 2024年03月

    日本学術振興会  科学研究費助成事業 研究活動スタート支援  研究活動スタート支援

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  • POLARBEAR-2実験による原始重力波の探索

    研究課題/領域番号:19J10652  2019年04月 - 2021年03月

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    高取 沙悠理

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    配分額:2100000円 ( 直接経費:2100000円 )

    インフレーション仮説を実験的に検証することは現代宇宙論における重要課題となっている。本研究の目的は、宇宙マイクロ波背景放射(CMB)偏光観測用の新型レシーバーPOLARBEAR-2(PB-2)を用いた大角度スケールの観測により、原始重力波起源のBモード偏光の精密探索を行うことで、インフレーション仮説の実験的検証を行うことである。PB-2レシーバーは高エネルギー加速器研究機構(KEK)での開発と性能評価試験完了後、南米チリのアタカマ高地(標高5200m)にある観測所に設置された望遠鏡本体へ統合され、現在統合試験が進行中である。
    これまで、PB-2レシーバーに搭載される超伝導検出器用の較正用の光源装置の開発を行ってきた。この較正光源装置からの参照信号に対する検出器の応答性を測定することで、各検出器の時間応答性や、観測中の焦点面の温度変化や大気のゆらぎ等の影響による検出器の応答性の変動を評価することができる。
    本年度は、統合試験において実際に較正光源装置からの参照信号を検出することに成功し、信号データの取得を行うことが出来た。統合試験での観測データ解析は共同研究機関であるアメリカのローレンスバークレー国立研究所にて行い、実際に較正装置の信号に対する各検出器の応答から超伝導検出器のバイアス状態の評価や、搭載された数千個の検出器の応答性の測定に成功した。これらの成果については国際学会と国内学会にて発表済みである。
    また、天体観測の測定データと組み合わせることで、較正光源装置の信号に対する性能評価をおこなった。
    年度末にはデータ解析の結果を踏まえ、実際にアタカマ高地にある観測所に行き、現地にて追加の観測データの取得も行った。

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