Radiation Damage on X-Ray CCDs and Restoration Technique for Space Astronomy

We studied the proton damage effects of the X-ray CCD, and searched for a possible restoration technique in orbit. We measured the X-ray CCD performances after irradiation at energies of 2 and 9.5 MeV, and confirmed a clear degradation of the charge transfer efficiency (CTE) and the energy resolutio...

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Bibliographic Details
Published in:Publications of the Astronomical Society of Japan 1997-06, Vol.49 (3), p.405-412
Main Authors: Tomida, Hiroshi, Matsumoto, Hironori, Ozaki, Masanobu, Tazawa, Yuji, Awaki, Hisamitsu, Tsuru, Takeshi, Koyama, Katsuji, Tsunemi, Hiroshi, Yamamoto, Koei
Format: Article
Language:English
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Summary:We studied the proton damage effects of the X-ray CCD, and searched for a possible restoration technique in orbit. We measured the X-ray CCD performances after irradiation at energies of 2 and 9.5 MeV, and confirmed a clear degradation of the charge transfer efficiency (CTE) and the energy resolution. To restore the degraded CTE and energy resolution, we tried a charge injection technique, and found the improvement in the CTI (= 1 − CTE) and energy resolution to be 1/4 and 1/3, respectively. We also estimated the energy level of the deep trap, which causes a quantization of the dark current from the radiation-damaged pixels. The trap energy level was about 0.57 eV, or near to the center of forbidden band.
ISSN:0004-6264
2053-051X
DOI:10.1093/pasj/49.3.405