The Digital Processing System for the Soft X-ray spectrometer onboard ASTRO-H-the design and the performance-
The Digital Processing System for the Soft X-ray spectrometer onboard ASTRO-H-the design and the performance-
复制标题
ASTRO-H机载软X射线能谱仪数字处理系统-设计与性能-
DOI：
10.1109/tns.2011.2179671
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发表时间：
2012
影响因子：
1.8
通讯作者：
ほか17名
中科院分区：
文献类型：
--
作者：
瀬田裕美、田代信、石崎欣尚、辻本匡弘;ほか17名
我们报告的设计和性能的数字信号处理系统的工程模型称为脉冲形状处理器（PSP）的软X射线光谱仪（SXS）的ASTRO-H卫星上。SXS采用X射线微量热计系统，其中X射线光子由于光电吸收而被检测为热脉冲。将像素化的碲化汞吸收体冷却至50 mK。所需的能量分辨率为7 eV（FWHM）在6 keV。由于到卫星数据记录器的数据链路限于200 kbit/s，因此机载数字处理器PSP在实现所需分辨率方面起着关键作用。PSP也是SXS其他性能的速率限制因素，例如最大计数率和能量范围。在本文中，我们展示了PSP的设计，并显示性能的基础上进行了一系列的实验室测试与工程模型的探测器和模拟读出电子。我们发现，（1）PSP可以记录0.07-18 keV波段[能量范围]的能量，（2）包括探测器、模拟电子器件和PSP在内的工程模型系统的能量分辨率在5.9 keV [能量分辨率]时为4.8-5.7 eV，（3）PSP有足够的处理能力来处理比0.3Crab [最大计数率]更微弱的点状源。预计这些结果与飞行模型的结果非常相似，因此这些结果将有助于使用SXS的观测规划。
We report the design and the performance of the engineering model of the digital signal processing system called the Pulse Shape Processor (PSP) for the Soft X-ray Spectrometer (SXS) onboard the ASTRO-H satellite. The SXS employs an X-ray microcalorimeter system, in which X-ray photons are detected as a heat pulse due to photoelectric absorption. The pixelized HgTe absorbers are cooled down to 50 mK. The required energy resolution is 7 eV (FWHM) at 6 keV. Since the data link to the satellite data recorder is limited to 200 kbit s, the onboard digital processor PSP plays a critical role in achieving the required resolution. The PSP is also the rate-limiting factor for other performance of the SXS, such as maximum count rate and energy range. In this paper, we show the design of the PSP, and show the performance based on a series of laboratory tests performed with the engineering models of the detector and the analog readout electronics. We found that (1) the PSP can register energy in the 0.07–18 keV band [energy range], (2) the energy resolution of the engineering model system, including the detector, analog electronics, and the PSP, is 4.8–5.7 eV at 5.9 keV [energy resolution], and (3) the PSP has sufficient processing power to handle a point-like source fainter than 0.3 Crab [maximum count rate]. These results are expected to be quite similar to those with the flight model, thus the results will be useful for the observation planning using the SXS.