Development of BGO active shield for the ASTRO-H soft Gamma-ray Detector

Y. Hanabata, Y. Fukazawa, K. Yamaoka, H. Tajima, J. Kataoka, K. Nakazawa, H. Takahashi, T. Mizuno, M. Ohno, M. Kokubun, T. Takahashi, S. Watanabe, M. Tashiro, Y. Terada, C. Sasaki, K. Nakajima, T. Mizushima

研究成果: Conference contribution

抄録

Soft Gamma-ray Detector (SGD:40-600 keV) will be mounted on the 6th Japanese X-ray observatory ASTRO-H to be launched in 2014. The main part of the SGD is a Compton camera with a narrow field of view and surrounded by BGO active shields (SGD-BGO). Via this combination, the SGD can achieve sensitivity more than ten times superior to the Suzaku/HXD. The BGO active shield will also function as a gamma-ray burst monitor as proven by the wide-band all-sky monitor (WAM) of the Suzaku/HXD. Avalanche Photodiodes (APDs) are used to read out scintillation lights from the BGO. The size of the former also means we need to focus on collecting light from large, complex-shaped BGO blocks. The significant leakage current of the APD means a lower temperature is preferred to minimize the noise while a higher temperature is preferred to simplify the cooling system. To optimize the BGO shape and the operating temperature, we tested the performance of the BGO readout system with various BGO shapes under different operating temperatures. We also apply waveform sampling by flash-ADC and digital filter instead of a conventional analog filter and ADC scheme to reduce the space and power of the circuit with increased flexibilities. As an active shield, we need to achieve a threshold level of 50-100 keV. Here, we report on the studies of threshold energy of active shield under various conditions and signal processings.

本文言語English
ホスト出版物のタイトルSpace Telescopes and Instrumentation 2010
ホスト出版物のサブタイトルUltraviolet to Gamma Ray
DOI
出版ステータスPublished - 2010 10 20
イベントSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray - San Diego, CA, United States
継続期間: 2010 6 282010 7 2

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
7732
ISSN(印刷版)0277-786X

Conference

ConferenceSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
CountryUnited States
CitySan Diego, CA
Period10/6/2810/7/2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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