1. Optical Blocking Performance of CCDs Developed for the X-ray Astronomy Satellite XRISM
- Author
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Masayoshi Nobukawa, Hiromichi Okon, Masanobu Ozaki, Hiroshi Tsunemi, Takayoshi Kohmura, Kiyoshi Hayashida, Takashi Sako, Kouichi Hagino, Takaaki Tanaka, Hiroshi Nakajima, Isamu Hatsukade, Yukino Urabe, Kazunori Asakura, Fumiya Tanaka, Yusuke Nishioka, Kenichi Sugimoto, Makoto Yamauchi, Kazutaka Yamaoka, Koji Mori, Tadayasu Dotani, Hirofumi Noda, Koki Okazaki, Tomokage Yoneyama, Mariko Saito, Shogo B. Kobayashi, Hisanori Suzuki, Junko S. Hiraga, Jin Sato, Toshiyuki Takaki, Hideki Uchiyama, Yoshiaki Kanemaru, Yuki Amano, Kengo Hattori, Hironori Matsumoto, Maho Hanaoka, Kumiko K. Nobukawa, Hikari Kashimura, Hiroyuki Uchida, Shin ichiro Takagi, Hiroshi Murakami, Hiroshi Tomida, Y. Terada, Takeshi Go Tsuru, Ayami Ishikura, Shotaro Sakuma, and Sho Atsumi
- Subjects
Physics ,Nuclear and High Energy Physics ,X-ray astronomy ,business.industry ,X-ray detector ,FOS: Physical sciences ,Blocking (statistics) ,01 natural sciences ,010309 optics ,Blocking layer ,Optics ,Observatory ,0103 physical sciences ,Satellite ,Charge-coupled device ,business ,Astrophysics - Instrumentation and Methods for Astrophysics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,010303 astronomy & astrophysics ,Instrumentation ,Test sample - Abstract
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 "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., 6 pages, 4 figures, accepted for publication in NIMA, proceedings of the 12th International "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detector (HSTD12)
- Published
- 2020