Optical blocking performance of CCDs developed for the X-ray Astronomy Satellite XRISM
Optical blocking performance of CCDs developed for the X-ray Astronomy Satellite XRISM
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为 X 射线天文卫星 XRISM 开发的 CCD 的光学阻挡性能
DOI：
10.1016/j.nima.2020.164374
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Kazunori; et al.
中科院分区：
文献类型：
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作者：
Uchida;Hiroyuki; Tanaka;Takaaki; Amano;Yuki; Okon;Hiromichi; Tsuru;Takeshi G.; Nakajima;Hiroshi; Noda;Hirofumi; Hayashida;Kiyoshi; Matsumoto;Hironori; Hanaoka;Maho; Yoneyama;Tomokage; Okazaki;Koki; Asakura;Kazunori; et al.
我们一直在为计划于2021年发射的X射线天文卫星XRISM开发P沟道电荷耦合器件（CCD）。虽然CCD相机（软X射线成像仪：SXI）的基本设计与丢失的Hitomi（ASTRO-H）天文台几乎相同，但我们正在计划减少Hitomi数据中发现的最大问题之一的“光泄漏”现象。我们在XRISM CCD上采用了双层光学阻挡层，并在其背面添加了额外的铝层。我们开发了一个新设计的测试样品CCD和照射它的光学光来评估光学阻塞性能。因此，与Hitomi CCD相比，可有效减少漏光。因此，我们得出结论，新设计解决了这个问题，XRISM CCD满足SXI的使命要求。
We have been developing P-channel Charge-Coupled Devices (CCDs) for the upcoming X-ray Astronomy Satellite XRISM, planned to be launched in 2021. While the basic design of the CCD camera (Soft X-ray Imager: SXI) is almost the same as that of the lost Hitomi (ASTRO-H) observatory, we are planning to reduce the phenomenon of “light leakages” that is one of the largest problems recognized in Hitomi data. We adopted a double-layer optical blocking layer on the XRISM CCDs and also added an extra aluminum layer on the backside of them. We develop a newly designed test sample CCD and irradiate it with optical light to evaluate the optical blocking performance. As a result, light leakages are effectively reduced compared with that of the Hitomi CCDs. We thus conclude that the issue is solved by the new design and that the XRISM CCDs satisfy the mission requirement for the SXI.