Hard x-ray imager onboard Hitomi (ASTRO-H)

Hard x-ray imager onboard Hitomi (ASTRO-H)
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Hitomi (ASTRO-H) 上搭载的硬 X 射线成像仪

DOI:
10.1117/1.jatis.4.2.021410
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发表时间:
2018
期刊:
Journal of Astronomical Telescopes, Instruments, and Systems
影响因子:
--
通讯作者:
T. Yuasa
T. Yuasa
中科院分区:
--
文献类型:
--
作者:
K. Nakazawa;G. Sato;M. Kokubun;T. Enoto;Y. Fukazawa;K. Hagino;Katsuhiro Hayashi;J. Kataoka;J. Katsuta;S. Kobayashi;P. Laurent;F. Lebrun;O. Limousin;D. Maier;K. Makishima;T. Mizuno;K. Mori;T. Nakamori;T. Nakano;H. Noda;H. Odaka;M. Ohno;M. Ohta;S. Saito;R. Sato;H. Tajima;H. Takahashi;Tadayuki Takahashi;S. Takeda;Takaaki Tanaka;Y. Terada;H. Uchiyama;Y. Uchiyama;S. Watanabe;K. Yamaoka;Y. Yatsu;T. Yuasa

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抽象的。Hitomi X射线天文台的硬X射线成像光谱系统由两套硬X射线成像仪(HXI)和硬X射线望远镜(HXT)组成。该系统的焦距为12米,可提供精细(1    .7半功率直径)成像光谱,覆盖约5至80 keV。HXI传感器由一个由四层Si和一层CdTe半导体成像器组成的摄像机和一个由九个Bi 4Ge 3 O 12反射器组成的有源屏蔽组成,以提供低背景。这两个HXI于2016年3月8日和14日开始观察,并一直运行到3月26日。使用螃蟹观察,5至80 keV的能量覆盖和良好的检测效率得到证实。通过削减高背景时间间隔、采用复杂的能量依赖成像器层选择、阻挡宇宙X射线背景和主动屏蔽,在5至80 keV下实现了1至3 × 10 − 4计数s − 1 keV − 1 cm − 2(在探测器几何区域内)的探测器本底水平。这个能级是在这个能带中工作的最低探测器之一。通过有效面积和背景的比较,表明HXI对点源的灵敏度与努斯塔相当,对大范围扩散源的灵敏度要高出3 ~ 4倍。
Abstract. The hard x-ray imaging spectroscopy system of “Hitomi” x-ray observatory is composed of two sets of hard x-ray imagers (HXI) coupled with hard x-ray telescopes (HXT). With a 12-m focal length, the system provides fine (1  ′    .  7 half-power diameter) imaging spectroscopy covering about 5 to 80 keV. The HXI sensor consists of a camera, which is composed of four layers of Si and one layer of CdTe semiconductor imagers, and an active shield composed of nine Bi4Ge3O12 scintillators to provide low background. The two HXIs started observation on March 8 and 14, 2016 and were operational until 26 March. Using a Crab observation, 5 to 80 keV energy coverage and good detection efficiency were confirmed. The detector background level of 1 to 3  ×  10  −  4  counts s  −  1 keV  −  1 cm  −  2 (in detector geometrical area) at 5 to 80 keV was achieved, by cutting the high-background time-intervals, adopting sophisticated energy-dependent imager layer selection, and baffling of the cosmic x-ray background and active-shielding. This level is among the lowest of detectors working in this energy band. By comparing the effective area and the background, it was shown that the HXI had a sensitivity that is same to that of NuSTAR for point sources and 3 to 4 times better for largely extended diffuse sources.
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