29 July 2010 Soft gamma-ray detector for the ASTRO-H Mission
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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 (40-600 keV) at a background level 10 times better than the current instruments on orbit. 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. The ASTRO-H mission is approved by ISAS/JAXA to proceed to a detailed design phase with an expected launch in 2014. In this paper, we present science drivers and concept of the SGD instrument followed by detailed description of the instrument and expected performance.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hiroyasu Tajima, Hiroyasu Tajima, Roger Blandford, Roger Blandford, Teruaki Enoto, Teruaki Enoto, Yasushi Fukazawa, Yasushi Fukazawa, Kirk Gilmore, Kirk Gilmore, Tuneyoshi Kamae, Tuneyoshi Kamae, Jun Kataoka, Jun Kataoka, Madoka Kawaharada, Madoka Kawaharada, Motohide Kokubun, Motohide Kokubun, Philippe Laurent, Philippe Laurent, Francois Lebrun, Francois Lebrun, Olivier Limousin, Olivier Limousin, Greg Madejski, Greg Madejski, Kazuo Makishima, Kazuo Makishima, Tsunefumi Mizuno, Tsunefumi Mizuno, Kazuhiro Nakazawa, Kazuhiro Nakazawa, Masanori Ohno, Masanori Ohno, Masayuki Ohta, Masayuki Ohta, Goro Sato, Goro Sato, Rie Sato, Rie Sato, Hiromitsu Takahashi, Hiromitsu Takahashi, Tadayuki Takahashi, Tadayuki Takahashi, Takaaki Tanaka, Takaaki Tanaka, Makoto Tashiro, Makoto Tashiro, Yukikatsu Terada, Yukikatsu Terada, Yasunobu Uchiyama, Yasunobu Uchiyama, Shin Watanabe, Shin Watanabe, Kazutaka Yamaoka, Kazutaka Yamaoka, Daisuke Yonetoku, Daisuke Yonetoku, } "Soft gamma-ray detector for the ASTRO-H Mission", Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 773216 (29 July 2010); doi: 10.1117/12.857531; https://doi.org/10.1117/12.857531


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