27 July 2016 Hard x-ray imaging polarimeter for PolariS
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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.
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Kiyoshi Hayashida, Kiyoshi Hayashida, Juyong Kim, Juyong Kim, Masaaki Sadamoto, Masaaki Sadamoto, Keigo Yoshinaga, Keigo Yoshinaga, Shuichi Gunji, Shuichi Gunji, Tatehiro Mihara, Tatehiro Mihara, Yuji Kishimoto, Yuji Kishimoto, Hidetoshi Kubo, Hidetoshi Kubo, Tsunefumi Mizuno, Tsunefumi Mizuno, Hiromitsu Takahashi, Hiromitsu Takahashi, Tadayasu Dotani, Tadayasu Dotani, Daisuke Yonetoku, Daisuke Yonetoku, Takeshi Nakamori, Takeshi Nakamori, Tomokage Yoneyama, Tomokage Yoneyama, Yuki Ikeyama, Yuki Ikeyama, Fumiyoshi Kamitsukasa, Fumiyoshi Kamitsukasa, } "Hard x-ray imaging polarimeter for PolariS", Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99051A (27 July 2016); doi: 10.1117/12.2232472; https://doi.org/10.1117/12.2232472
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