Soft x-ray imager (SXI) onboard ASTRO-H
Soft x-ray imager (SXI) onboard ASTRO-H
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ASTRO-H 机载软 X 射线成像仪 (SXI)
DOI：
10.1117/12.2230672
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Masachika; Nobukawa,
中科院分区：
文献类型：
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作者：
Tsunemi;Hiroshi; Hayashida;Kiyoshi; Tsuru;Takeshi Go; Dotani;Tadayasu; Nakajima;Hiroshi; Anabuki;Naohisa; Nagino;Ryo; Tanaka;Takaaki; Uchida;Hiroyuki; Ozaki;Masanobu; Natsukari;Chikara; Tomida;Hiroshi; Ueda;Shutaro; Iwai;Masachika; Nobukawa,
我们在这里报告ASTRO-H上SXI的性能，该性能从2016年3月2日开始运行。SXI由4个CCD组成，覆盖38' X 38'天空区域。它们是耗尽层为200 μm的P沟道背照式CCD。电荷注入（CI）方法从使命开始时就应用。SXI配备了两个单级斯特林冷却器，其中一个有足够的功率将CCD冷却到-110 ° C。SXI的性能有两个问题：一个是光泄漏，另一个是宇宙射线回波。光泄漏是由于日地球通过卫星基板上的孔将可见光照射到SXI主体上。它可以通过选择不在反日地球方向上的目标来避免。宇宙线回波的产生是由于参数取值不当造成的，通过对这些参数的修正，宇宙线回波对图像没有影响。使用RXJ1856.5-3754的结果，我们确认CCD上可能的污染物完全在我们的预期范围内。
We report here the performance of the SXI on ASTRO-H that was started its operation from March,02 2016. The SXI consists of 4 CCDs that cover 38' X 38' sky region. They are P-channel back-illumination type CCD with a depletion layer of 200 μm. Charge injection (CI) method is applied from its beginning of the mission. Two single stage sterling coolers are equipped with the SXI while one of them has enough power to cool the CCD to -110°C. There are two issues in the SXI performance: one is a light-leak and the other is a cosmic-ray echo. The light-leak is due to the fact that the day-Earth irradiates visible lights onto the SXI body through holes in the satellite base plate. It can be avoided by selecting targets not on the anti-day-Earth direction. The cosmic-ray echo is due to the improper parameter values that is fixed by revising them with which the cosmic-ray echo does not affect the image. Using the results of RXJ1856.5-3754, we confirm that the possible contaminants on the CCD is well within our expectation.