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, Hiroyasu Tajima, Yasushi Fukazawa, Roger Blandford, Teruaki Enoto, Jun Kataoka, Madoka Kawaharada, Motohide Kokubun, Philippe Laurent, François Lebrun, Olivier Limousin, Greg Madejski, Kazuo Makishima, Tsunefumi Mizuno, Takeshi Nakamori, Kazuhiro Nakazawa, Kunishiro Mori, Hirokazu Odaka, Masanori Ohno, Masayuki Ohta, Goro Sato, Rie Sato, Shin'ichiro Takeda, Hiromitsu Takahashi, Tadayuki Takahashi, Takaaki Tanaka, Makoto Tashiro, Yukikatsu Terada, Hideki Uchiyama, Yasunobu Uchiyama, Shinya Yamada, Yoichi Yatsu, Daisuke Yonetoku, 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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