Design and performance of Soft Gamma-ray Detector onboard the Hitomi (ASTRO-H) satellite
Design and performance of Soft Gamma-ray Detector onboard the Hitomi (ASTRO-H) satellite
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Hitomi (ASTRO-H) 卫星上软伽马射线探测器的设计和性能
DOI：
10.1117/1.jatis.4.2.021411
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
他40名
中科院分区：
文献类型：
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作者：
Tajima;H.;Fukazawa;Y.(3番目);他40名
Hitomi（ASTRO-H）是日本第六颗X射线卫星，其携带的仪器具有<7 eV的精密能量分辨率和0.3至600 keV的广泛能量覆盖范围。软伽马射线探测器（SGD）是Hitomi仪器，可观测到最高能量带（60至600 keV）。SGD设计通过结合主动屏蔽和康普顿相机来实现低背景水平，其中康普顿运动学被用于拒绝来自视场之外的背景。一个紧凑和高效的康普顿相机实现使用硅和碲化镉半导体传感器的组合具有良好的能量分辨率。康普顿运动学也携带伽马射线偏振的信息，使SGD成为一个优秀的偏振计。经过几年的开发，该卫星于2016年2月17日成功发射。在验证SGD组件的正常功能后，于2016年3月24日启动标称观察模式。SGD在2016年3月26日航天器停止运行之前观察了蟹状星云大约两个小时。我们提出的SGD设计的概念，然后详细描述的仪器和它的性能在地面和轨道上测量。
Hitomi (ASTRO-H) was the sixth Japanese x-ray satellite that carried instruments with exquisite energy resolution of <7 eV and broad energy coverage of 0.3 to 600 keV. The Soft Gamma-ray Detector (SGD) was the Hitomi instrument that observed the highest energy band (60 to 600 keV). The SGD design achieves a low background level by combining active shields and Compton cameras where Compton kinematics is utilized to reject backgrounds coming from outside of the field of view. A compact and highly efficient Compton camera is realized using a combination of silicon and cadmium telluride semiconductor sensors with a good energy resolution. Compton kinematics also carries information for gamma-ray polarization, making the SGD an excellent polarimeter. Following several years of development, the satellite was successfully launched on February 17, 2016. After proper functionality of the SGD components were verified, the nominal observation mode was initiated on March 24, 2016. The SGD observed the Crab Nebula for approximately two hours before the spacecraft ceased to function on March 26, 2016. We present concepts of the SGD design followed by detailed description of the instrument and its performance measured on ground and in orbit.