Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasj...49..405t&link_type=abstract
Publications of the Astronomical Society of Japan, v.49, p.405-412.
Astronomy and Astrophysics
Astronomy
9
Instruments: Detectors, X-Rays: General, X-Rays: Spectra
Scientific paper
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.
Awaki Hisamitsu
Koyama Katsuji
Matsumoto Hironori
Ozaki Masanobu
Tazawa Yuji
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