2020/07/16 by Hiroyuki Uchida, Takaaki Tanaka, Yuki Amano +52 · 11 citations
Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy #Astrophysical Phenomena and Observations #Blocking (statistics) #CCD and CMOS Imaging Sensors #Charge-coupled device #Computer science #Geology #Layer (electronics) #Materials science #Nanotechnology #Observatory #Optics #Physics #Remote sensing #Satellite #astro-ph.IM
paper · pdf · doi:10.1016/j.nima.2020.164374
published in Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 978, 164374 (Elsevier BV) · 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)
arxiv created 2020/07/16 · openalex publication_date 2020/07/18 · arxiv updated 2020/08/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.