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Proceedings Paper

Development and verification of signal processing system of BGO active shield onboard Astro-H
Author(s): Masanori Ohno; Shin'ya Tokuda; Takafumi Kawano; Shunya Furui; Ikumi Edahiro; Hiromitsu Takahashi; Kunihiro Goto; Yasushi Fukazawa; Hiroaki Murakami; Syogo Kobayashi; Soki Sakurai; Makoto Sasano; Shunsuke Torii; Toshio Nakano; Ko Ono; Katsuma Miyake; Terukazu Nishida; Kazuhiro Nakazawa; Kazuo Makishima; Kouichi Hagino; Takayuki Yuasa; Hirokazu Odaka; Rie Sato; Shin Watanabe; Motohide Kokubun; Tadayuki Takahashi; Goro Sato; Jun Kataoka; Tatsuhiko Saito; Kazutaka Yamaoka; Hiroyasu Tajima; Yoichi Yatsu; Takeshi Nakamori; Hideki Uchiyama; Daisuke Yonetoku
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Paper Abstract

The hard X-ray imager (HXI) and soft gamma-ray detector (SGD) onboard Astro-H observe astronomical objects with high sensitivity in the hard X-ray (5−80 keV) and soft gamma-ray (40−600 keV) energy bands. To achieve this high sensitivity, background rejection is essential, and these detectors are surrounded by large and thick bismuth germinate scintillators as an active shield. We have developed adequate trigger logic for both the HXI and SGD to process signals from main detector and BGO shield simultaneously and then we optimized the trigger delay and width, with consideration of the trigger latch efficiency. The shield detector system performs well, even after it is assembled as the HXI sensor. The energy threshold maintains the same level as that observed during the prototype development phase, and the experimental room background level of the main detector is successfully reduced by our optimized trigger timing.

Paper Details

Date Published: 25 July 2014
PDF: 13 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91445G (25 July 2014); doi: 10.1117/12.2055676
Show Author Affiliations
Masanori Ohno, Hiroshima Univ. (Japan)
Shin'ya Tokuda, Hiroshima Univ. (Japan)
Takafumi Kawano, Hiroshima Univ. (Japan)
Shunya Furui, Hiroshima Univ. (Japan)
Ikumi Edahiro, Hiroshima Univ. (Japan)
Hiromitsu Takahashi, Hiroshima Univ. (Japan)
Kunihiro Goto, Hiroshima Univ. (Japan)
Yasushi Fukazawa, Hiroshima Univ. (Japan)
Hiroaki Murakami, The Univ. of Tokyo (Japan)
Syogo Kobayashi, The Univ. of Tokyo (Japan)
Soki Sakurai, The Univ. of Tokyo (Japan)
Makoto Sasano, The Univ. of Tokyo (Japan)
Shunsuke Torii, The Univ. of Tokyo (Japan)
Toshio Nakano, The Univ. of Tokyo (Japan)
Ko Ono, The Univ. of Tokyo (Japan)
Katsuma Miyake, The Univ. of Tokyo (Japan)
Terukazu Nishida, The Univ. of Tokyo (Japan)
Kazuhiro Nakazawa, The Univ. of Tokyo (Japan)
Kazuo Makishima, The Univ. of Tokyo (Japan)
Kouichi Hagino, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Takayuki Yuasa, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Hirokazu Odaka, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Rie Sato, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Shin Watanabe, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Motohide Kokubun, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Tadayuki Takahashi, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Goro Sato, Waseda Univ. (Japan)
Jun Kataoka, Waseda Univ. (Japan)
Tatsuhiko Saito, Waseda Univ. (Japan)
Kazutaka Yamaoka, Nagoya Univ. (Japan)
Hiroyasu Tajima, Nagoya Univ. (Japan)
Yoichi Yatsu, Tokyo Institute of Technology (Japan)
Takeshi Nakamori, Yamagata Univ. (Japan)
Hideki Uchiyama, Shizuoka Univ. (Japan)
Daisuke Yonetoku, Kanazawa Univ. (Japan)


Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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