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Proceedings Paper

Proton irradiation test to scintillator-directory-coupled CCD onboard FFAST
Author(s): Ryo Nagino; Hiroshi Nakajima; Masaaki Sadamoto; Masayuki Sasaki; Hiroshi Tsunemi; Kiyoshi Hayashida; Naohisa Anabuki; Hisashi Kitamura; Yukio Uchihori
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Paper Abstract

FFAST is a large area sky survey mission at hard X-ray region by using a spacecraft formation flying. It consists of two small satellites, a telescope satellite, carrying a multilayer super mirror, and a detector satellite, carrying scintillator-deposited CCDs (SD-CCDs). SD-CCD is the imaging device which realized sensitivity to 80 keV by pasting up a scintillator on CCD directly. Soft X-ray events are directly detected in the CCD. On the other hand, Hard X-ray events are converted to optical photons by the scintillator and then the CCD detects the photons. We have obtained the spectrum with 109Cd and successfully detected the events originated from the CsI. For a space use of a CCD, we have to understand aged deterioration of CCD in high radiative environments. In addition, in the case of SD-CCD, we must investigate the influence of radio-activation of a scintillator. We performed experiments of proton irradiation to the SD-CCD as space environmental tests of cosmic rays. The SD-CCD is irradiated with the protons with the energy of 100 MeV and neglected for about 150 hours. As a result, the derived CTI profile of SD-CCD is similarly to ones of XIS/Suzaku and NeXT4 CCD/ASTRO-H. In contrast, CTIs derived from the data within 4 hours after irradiation is 10 times or more larger than the ones after 150 hours. This may be due to influence of an annealing. We also report a performance study of SD-CCD, including the detection of scintillation events, before proton irradiation.

Paper Details

Date Published: 26 September 2013
PDF: 8 pages
Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590G (26 September 2013); doi: 10.1117/12.2022848
Show Author Affiliations
Ryo Nagino, Osaka Univ. (Japan)
Hiroshi Nakajima, Osaka Univ. (Japan)
Masaaki Sadamoto, Osaka Univ. (Japan)
Masayuki Sasaki, Osaka Univ. (Japan)
Hiroshi Tsunemi, Osaka Univ. (Japan)
Kiyoshi Hayashida, Osaka Univ. (Japan)
Naohisa Anabuki, Osaka Univ. (Japan)
Hisashi Kitamura, National Institute for Radiological Sciences (Japan)
Yukio Uchihori, National Institute for Radiological Sciences (Japan)

Published in SPIE Proceedings Vol. 8859:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII
Oswald H. Siegmund, Editor(s)

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