Development and verification of signal processing system of avalanche photo diode for the active shields onboard ASTRO-H

M. Ohno, T. Kawano,Ikumi Edahiro, H. Shirakawa, N. Ohashi, C. Okada,Sho Habata,Junichiro Katsuta,Y. Tanaka,H. Takahashi,T. Mizuno,Yasushi Fukazawa,H. Murakami, S. Kobayashi,Katsuma Miyake,Ko Ono,Yuichi Kato, Y. Furuta, Y. Murota,K. Okuda, Y. Wada,Kazuhiro Nakazawa, Taketo Mimura,J. Kataoka,Y. Ichinohe,Yusuke Uchida,M. Katsuragawa,H. Yoneda,Goro Sato, Reiko Sato,Madoka Kawaharada,Atsushi Harayama,Hirokazu Odaka,Katsuhiro Hayashi,Masayuki Ohta,Sei-ichiro Watanabe,Motohide Kokubun,Tadayuki Takahashi,Shin'ichiro Takeda,Masaomi Kinoshita,Kazutaka Yamaoka,Hiroyasu Tajima,Y. Yatsu,Hideki Uchiyama,Shinya Saito,Takayuki Yuasa,Kazuo Makishima

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment（2016）

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摘要

The hard X-ray Imager and Soft Gamma-ray Detector onboard ASTRO-H demonstrate high sensitivity to hard X-ray (5–80keV) and soft gamma-rays (60–600keV), respectively. To reduce the background, both instruments are actively shielded by large, thick Bismuth Germanate scintillators. We have developed the signal processing system of the avalanche photodiode in the BGO active shields and have demonstrated its effectiveness after assembly in the flight model of the HXI/SGD sensor and after integration into the satellite. The energy threshold achieved is about 150keV and anti-coincidence efficiency for cosmic-ray events is almost 100%. Installed in the BGO active shield, the developed signal processing system successfully reduces the room background level of the main detector.

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关键词

ASTRO-H,APD,Active shield,Signal processing

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