Preflight calibration and performance of the astro-E2/HXD-II wide-band all-sky monitor
2005; Institute of Electrical and Electronics Engineers; Volume: 52; Issue: 6 Linguagem: Inglês
10.1109/tns.2005.860172
ISSN1558-1578
AutoresM. Ohno, Yasushi Fukazawa, K. Yamaoka, M. Kokubun, Y. Terada, J. Kotoku, Y. Okada, S. Hong, M. Mori, A. Tsutsui, Y. Endo, K. Makishima, T. Murakami, K. Nakazawa, T. Takahashi, M. Tashiro,
Tópico(s)Particle Detector Development and Performance
ResumoThe hard X-ray detector (HXD-II) onboard Astro-E2 consists of a main detector with energy range 10-600 keV and a BGO active shield detector for background reduction. The shield detector wide-band all-sky monitor (WAM) has been designed not only for background reduction but also for all sky monitoring of gamma-ray bursts (GRB) and bright soft gamma-ray sources. WAM has a large geometrical structure of BGO scintillators for reinforcing its stopping power and has an asymmetric shape for reducing its weight. This particular structure of WAM makes the gamma-ray response very complicated, and thus we need careful calibrations before the launch. We then performed preflight calibrations of WAM as a part of the HXD-II calibrations in 2003-2004. We measured the pulse height spectra and stopping power of each unit counter individually before the HXD-II integration by exposing them to collimated gamma-rays. After integration of the HXD-II detector and installing it to the spacecraft, we measured the same issues as above for WAM by irradiating the gamma-ray source from various directions. Taking into account these experimental results, we constructed the gamma-ray response matrix of WAM using the Geant4 Monte Carlo simulation. The response developed in this work was found to have reproduced the experimental data within 10-20% accuracy
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