25 July 2014 Development and verification of signal processing system of BGO active shield onboard Astro-H
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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.
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Masanori Ohno, Masanori Ohno, Shin'ya Tokuda, Shin'ya Tokuda, Takafumi Kawano, Takafumi Kawano, Shunya Furui, Shunya Furui, Ikumi Edahiro, Ikumi Edahiro, Hiromitsu Takahashi, Hiromitsu Takahashi, Kunihiro Goto, Kunihiro Goto, Yasushi Fukazawa, Yasushi Fukazawa, Hiroaki Murakami, Hiroaki Murakami, Syogo Kobayashi, Syogo Kobayashi, Soki Sakurai, Soki Sakurai, Makoto Sasano, Makoto Sasano, Shunsuke Torii, Shunsuke Torii, Toshio Nakano, Toshio Nakano, Ko Ono, Ko Ono, Katsuma Miyake, Katsuma Miyake, Terukazu Nishida, Terukazu Nishida, Kazuhiro Nakazawa, Kazuhiro Nakazawa, Kazuo Makishima, Kazuo Makishima, Kouichi Hagino, Kouichi Hagino, Takayuki Yuasa, Takayuki Yuasa, Hirokazu Odaka, Hirokazu Odaka, Rie Sato, Rie Sato, Shin Watanabe, Shin Watanabe, Motohide Kokubun, Motohide Kokubun, Tadayuki Takahashi, Tadayuki Takahashi, Goro Sato, Goro Sato, Jun Kataoka, Jun Kataoka, Tatsuhiko Saito, Tatsuhiko Saito, Kazutaka Yamaoka, Kazutaka Yamaoka, Hiroyasu Tajima, Hiroyasu Tajima, Yoichi Yatsu, Yoichi Yatsu, Takeshi Nakamori, Takeshi Nakamori, Hideki Uchiyama, Hideki Uchiyama, Daisuke Yonetoku, Daisuke Yonetoku, } "Development and verification of signal processing system of BGO active shield onboard Astro-H", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91445G (25 July 2014); doi: 10.1117/12.2055676; https://doi.org/10.1117/12.2055676

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