Hard X-ray and gamma-ray detector for ASTRO-H based on Si and CdTe imaging sensors
Hard X-ray and gamma-ray detector for ASTRO-H based on Si and CdTe imaging sensors
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DOI：
10.1016/j.nima.2010.03.024
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发表时间：
2010-11
影响因子：
1.4
通讯作者：
M. Kokubun;S. Watanabe;K. Nakazawa;H. Tajima;Y. Fukazawa;Tadayuki Takahashi;J. Kataoka;T. Kamae;H. Katagiri;G. Madejski;K. Makishima;T. Mizuno;M. Ohno;R. Sato;H. Takahashi;Takaaki Tanaka;M. Tashiro;Y. Terada;K. Yamaoka
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文献类型：
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作者：
M. Kokubun;S. Watanabe;K. Nakazawa;H. Tajima;Y. Fukazawa;Tadayuki Takahashi;J. Kataoka;T. Kamae;H. Katagiri;G. Madejski;K. Makishima;T. Mizuno;M. Ohno;R. Sato;H. Takahashi;Takaaki Tanaka;M. Tashiro;Y. Terada;K. Yamaoka
我们一直在开发硬X射线成像仪和软伽马射线探测器，作为ASTRO-H任务的机载仪器。硬X射线成像仪(HXI)是ASTRO-H的三个焦平面探测器之一，旨在结合硬X射线望远镜实现硬X射线光子的聚焦成像。通过使用双面硅条探测器和碲化镉条探测器组成的混合结构，它完全覆盖了高达80keV的能量范围，具有很高的量子效率。采用低噪声的前端ASIC，可同时获得250keV的高空间分辨率和1-2keV的能量分辨率(FWMH)。软伽马射线探测器(SGD)是一种新型的、独特的探测器，其特点是由窄视场有源屏蔽层包围的半导体康普顿探测器，它覆盖的能量范围比HXI高(30-600keV)。它由四个康普顿相机组成，由多层硅和镉镉垫探测器组成。凭借其多层结构和康普顿重建能力，除了雪崩光电二极管读取的BGO有源屏蔽外，该探测器将在轨道上实现极高的背景抑制效率。我们报告了硬件发展的现状，包括设计要求、预期性能和关键技术的技术准备情况。
We have been developing a hard X-ray imager and soft gamma-ray detector as on board instruments of the ASTRO-H mission. The Hard X-ray Imager (HXI) is one of the three focal plane detectors of ASTRO-H, which is aimed to realize the focusing imaging of hard X-ray photons in combination with hard X-ray telescopes. By use of the hybrid structure composed of double-sided silicon strip detectors and a cadmium telluride strip detector, it fully covers the energy range up to 80keV with a high quantum efficiency. High spatial resolutions of 250μm pitch and energy resolutions of 1–2keV (FWMH) are at the same time achieved with low noise front-end ASICs. The Soft Gamma-ray Detector (SGD) is a novel and unique detector which is characterized by semiconductor Compton cameras surrounded by narrow field-of-view active shields, and covers a higher energy range (30–600keV) than that of HXI. It consists of four Compton Cameras constructed with many layers of Silicon and CdTe pad detectors. With its multi-layer structure and Compton reconstruction capability, in addition to the BGO active shields read by Avalanche photo-diodes, this detector will achieve an extremely high background rejection efficiency in the orbit. We report the current status of hardware development including the design requirement, expected performance, and technical readinesses of key technologies.