Proton irradiation test to scintillator-directory-coupled CCD onboard FFAST

Ryo Nagino; Hiroshi Nakajima; Masaaki Sadamoto; Masayuki Sasaki; Hiroshi Tsunemi; Kiyoshi Hayashida; Naohisa Anabuki; Hisashi Kitamura; Yukio Uchihori

doi:10.1117/12.2022848

26 September 2013 Proton irradiation test to scintillator-directory-coupled CCD onboard FFAST

Ryo Nagino, Hiroshi Nakajima, Masaaki Sadamoto, Masayuki Sasaki, Hiroshi Tsunemi, Kiyoshi Hayashida, Naohisa Anabuki, Hisashi Kitamura, Yukio Uchihori

Author Affiliations +

Proceedings Volume 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII; 88590G (2013) https://doi.org/10.1117/12.2022848
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

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.

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Ryo Nagino, Hiroshi Nakajima, Masaaki Sadamoto, Masayuki Sasaki, Hiroshi Tsunemi, Kiyoshi Hayashida, Naohisa Anabuki, Hisashi Kitamura, and Yukio Uchihori "Proton irradiation test to scintillator-directory-coupled CCD onboard FFAST", Proc. SPIE 8859, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVIII, 88590G (26 September 2013); https://doi.org/10.1117/12.2022848

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KEYWORDS

Charge-coupled devices

Scintillators

X-rays

Satellites

Hard x-rays

Photons

Aluminum

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