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Proceedings Paper

Hard x-ray imaging polarimeter for PolariS
Author(s): Kiyoshi Hayashida; Juyong Kim; Masaaki Sadamoto; Keigo Yoshinaga; Shuichi Gunji; Tatehiro Mihara; Yuji Kishimoto; Hidetoshi Kubo; Tsunefumi Mizuno; Hiromitsu Takahashi; Tadayasu Dotani; Daisuke Yonetoku; Takeshi Nakamori; Tomokage Yoneyama; Yuki Ikeyama; Fumiyoshi Kamitsukasa
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Paper Abstract

Hard X-ray imaging polarimeters are developed for the X-ray γ-ray polaeimtery satellite PolariS. The imaging polarimter is scattering type, in which anisotropy in the direction of Compton scattering is employed to measure the hard X-ray (10-80 keV) polarization, and is installed on the focal planes of hard X-ray telescopes. We have updated the design of the model so as to cover larger solid angles of scattering direction. We also examine the event selection algorithm to optimize the detection efficiency of recoiled electrons in plastic scintillators. We succeed in improving the efficiency by factor of about 3-4 from the previous algorithm and criteria for 18-30 keV incidence. For 23 keV X-ray incidence, the recoiled electron energy is about 1 keV. We measured the efficiency to detect recoiled electrons in this case, and found about half of the theoretical limit. The improvement in this efficiency directly leads to that in the detection efficiency. In other words, however, there is still a room for improvement. We examine various process in the detector, and estimate the major loss is primarily that of scintillation light in a plastic scintillator pillar with a very small cross section (2.68mm squared) and a long length (40mm). Nevertheless, the current model provides the MDP of 6% for 10mCrab sources, which are the targets of PolariS.

Paper Details

Date Published: 27 July 2016
PDF: 10 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99051A (27 July 2016); doi: 10.1117/12.2232472
Show Author Affiliations
Kiyoshi Hayashida, Osaka Univ. (Japan)
Juyong Kim, Osaka Univ. (Japan)
Masaaki Sadamoto, Osaka Univ. (Japan)
Keigo Yoshinaga, Osaka Univ. (Japan)
Shuichi Gunji, Yamagata Univ. (Japan)
Tatehiro Mihara, RIKEN (Japan)
Yuji Kishimoto, KEK (Japan)
Hidetoshi Kubo, Kyoto Univ. (Japan)
Tsunefumi Mizuno, Hiroshima Univ. (Japan)
Hiromitsu Takahashi, Hiroshima Univ. (Japan)
Tadayasu Dotani, ISAS JAXA (Japan)
Daisuke Yonetoku, Kanazawa Univ. (Japan)
Takeshi Nakamori, Yamagata Univ. (Japan)
Tomokage Yoneyama, Osaka Univ. (Japan)
Yuki Ikeyama, Osaka Univ. (Japan)
Fumiyoshi Kamitsukasa, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 9905:
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Tadayuki Takahashi; Marshall Bautz, Editor(s)

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