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

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

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.

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