Soft X-ray Imager aboard Hitomi (ASTRO-H)
Soft X-ray Imager aboard Hitomi (ASTRO-H)
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Hitomi (ASTRO-H) 上的软 X 射线成像仪
DOI：
10.1117/1.jatis.4.1.011211
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Dotani Tadayasu
中科院分区：
文献类型：
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作者：
Tanaka Takaaki;Uchida Hiroyuki;Nakajima Hiroshi;Tsunemi Hiroshi;Hayashida Kiyoshi;Tsuru Takeshi Go;Dotani Tadayasu
软x射线成像仪（SXI）是在瞳x射线天文台上使用电荷耦合器件（ccd）的成像光谱仪。SXI传感器有四个ccd，其成像面积大小排列成阵列。结合x射线镜，软x射线望远镜，SXI探测0.4和12 keV之间的x射线并覆盖视野。该ccd为p通道完全耗尽型背光型，耗尽层厚度为。采用低工作温度和电荷注入来降低ccd的电荷转移效率。SXI的功能和性能在地面测试中得到验证。对于5.9 kev的x射线，测得的能量分辨率为161 ~ 170 eV全宽半高。在测试中，我们发现一些地区的CTI明显更高。提出了一种正确处理位置相关CTI的方法。我们发现的另一个问题是在ccd入射表面的Al涂层上有针孔，用于光学光阻挡。增加污染阻挡滤光片的铝厚度以充分阻挡可见光。
The Soft X-ray Imager (SXI) is an imaging spectrometer using charge-coupled devices (CCDs) aboard the Hitomi x-ray observatory. The SXI sensor has four CCDs with an imaging area size ofarranged in aarray. Combined with the x-ray mirror, the Soft X-ray Telescope, the SXI detects x-rays between 0.4 and 12 keV and covers afield of view. The CCDs are P-channel fully depleted, back-illumination type with a depletion layer thickness of. Low operation temperature down toas well as charge injection is employed to reduce the charge transfer inefficiency (CTI) of the CCDs. The functionality and performance of the SXI are verified in on-ground tests. The energy resolution measured is 161 to 170 eV in full width at half maximum for 5.9-keV x-rays. In the tests, we found that the CTI of some regions is significantly higher. A method is developed to properly treat the position-dependent CTI. Another problem we found is pinholes in the Al coating on the incident surface of the CCDs for optical light blocking. The Al thickness of the contamination blocking filter is increased to sufficiently block optical light.