In-flight performance of the soft x-ray spectrometer detector system on Astro-H
In-flight performance of the soft x-ray spectrometer detector system on Astro-H
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Astro-H 上软 X 射线光谱仪探测器系统的飞行性能
DOI：
10.1117/1.jatis.4.1.011218
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
McCammon Daniel
中科院分区：
文献类型：
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作者：
Porter Frederick S.;Boyce Kevin R.;Chiao Meng P.;Eckart Megan E.;Fujimoto Ryuichi;Ishisaki Yoshitaka;Kilbourne Caroline Anne;Leutenegger Maurice A.;McCammon Daniel
软X射线光谱仪(SXS)于2016年2月17日在Astro-H(日立)天文台发射升空。SXS基于已成功部署在许多地面和亚轨道光谱仪上的高灵敏度X射线量热计探测器系统。该仪器将为从木星大气到星系团外围的几乎每一类发射X射线的天体提供基本诊断，而不会退化空间扩展的天体。SXS探测器系统由一个36像素的低温微量热计阵列组成，工作在50mK的热沉温度下。在飞行前测试中，该探测器系统在6keV时的分辨率优于1300，同时带通从0.3keV以下到12keV以上，定时精度优于。此外，在探测器阵列的正后方放置了一个固态反符合探测器，用于背景抑制。探测器误差预算包括来自SXS冷却系统和航天器的测量干扰。在轨增益稳定性和在轨航天器干扰的额外裕度也包括预测在6-keV时达到或超过7-EV半高宽要求的在轨性能。实际在轨光谱分辨率在6keV时优于5 eV半高宽，很容易满足仪器要求。在这里，我们讨论SXS探测器系统的实际在轨性能，并将其与飞行前测试和在轨预测的性能进行比较。我们还将讨论在轨增益稳定性、额外的在轨干扰以及在轨背景的测量。
The soft x-ray spectrometer (SXS) instrument was launched aboard the Astro-H (Hitomi) observatory on February 17, 2016. The SXS is based on a high-sensitivity x-ray calorimeter detector system that has been successfully deployed in many ground and suborbital spectrometers. The instrument was to provide essential diagnostics for nearly every class of x-ray emitting objects from the atmosphere of Jupiter to the outskirts of galaxy clusters, without degradation for spatially extended objects. The SXS detector system consisted of a 36-pixel cryogenic microcalorimeter array operated at a heat sink temperature of 50 mK. In preflight testing, the detector system demonstrated a resolving power of better than 1300 at 6 keV with a simultaneous bandpass from below 0.3 keV to above 12 keV with a timing precision better than. In addition, a solid-state anticoincidence detector was placed directly behind the detector array for background suppression. The detector error budget included the measured interference from the SXS cooling system and the spacecraft. Additional margin for on-orbit gain stability and on-orbit spacecraft interference were also included predicting an on-orbit performance that meets or exceeds the 7-eV FWHM at 6-keV requirement. The actual on-orbit spectral resolution was better than 5 eV FWHM at 6 keV, easily satisfying the instrument requirement. Here, we discuss the actual on-orbit performance of the SXS detector system and compare this to performance in preflight testing and the on-orbit predictions. We will also discuss the on-orbit gain stability, additional on-orbit interference, and measurements of the on-orbit background.