17 September 2012 Soft gamma-ray detector for the ASTRO-H Mission
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Abstract
ASTRO-H is the next generation JAXA X-ray satellite, intended to carry instruments with broad energy coverage and exquisite energy resolution. The Soft Gamma-ray Detector (SGD) is one of ASTRO-H instruments and will feature wide energy band (60–600 keV) at a background level 10 times better than the current instruments on orbit. The SGD is complimentary to ASTRO-H’s Hard X-ray Imager covering the energy range of 5–80 keV. The SGD achieves low background by combining a Compton camera scheme with a narrow field-of-view active shield where Compton kinematics is utilized to reject backgrounds. The Compton camera in the SGD is realized as a hybrid semiconductor detector system which consists of silicon and CdTe (cadmium telluride) sensors. Good energy resolution is afforded by semiconductor sensors, and it results in good background rejection capability due to better constraints on Compton kinematics. Utilization of Compton kinematics also makes the SGD sensitive to the gamma-ray polarization, opening up a new window to study properties of gamma-ray emission processes. In this paper, we will present the detailed design of the SGD and the results of the final prototype developments and evaluations. Moreover, we will also present expected performance based on the measurements with prototypes.
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Shin Watanabe, Shin Watanabe, Hiroyasu Tajima, Hiroyasu Tajima, Yasushi Fukazawa, Yasushi Fukazawa, Roger Blandford, Roger Blandford, Teruaki Enoto, Teruaki Enoto, Jun Kataoka, Jun Kataoka, Madoka Kawaharada, Madoka Kawaharada, Motohide Kokubun, Motohide Kokubun, Philippe Laurent, Philippe Laurent, François Lebrun, François Lebrun, Olivier Limousin, Olivier Limousin, Greg Madejski, Greg Madejski, Kazuo Makishima, Kazuo Makishima, Tsunefumi Mizuno, Tsunefumi Mizuno, Takeshi Nakamori, Takeshi Nakamori, Kazuhiro Nakazawa, Kazuhiro Nakazawa, Kunishiro Mori, Kunishiro Mori, Hirokazu Odaka, Hirokazu Odaka, Masanori Ohno, Masanori Ohno, Masayuki Ohta, Masayuki Ohta, Goro Sato, Goro Sato, Rie Sato, Rie Sato, Shin'ichiro Takeda, Shin'ichiro Takeda, Hiromitsu Takahashi, Hiromitsu Takahashi, Tadayuki Takahashi, Tadayuki Takahashi, Takaaki Tanaka, Takaaki Tanaka, Makoto Tashiro, Makoto Tashiro, Yukikatsu Terada, Yukikatsu Terada, Hideki Uchiyama, Hideki Uchiyama, Yasunobu Uchiyama, Yasunobu Uchiyama, Shinya Yamada, Shinya Yamada, Yoichi Yatsu, Yoichi Yatsu, Daisuke Yonetoku, Daisuke Yonetoku, Takayuki Yuasa, Takayuki Yuasa, } "Soft gamma-ray detector for the ASTRO-H Mission", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 844326 (17 September 2012); doi: 10.1117/12.925977; https://doi.org/10.1117/12.925977
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