Long-term trends in radiation damage of Chandra X-ray CCDs

Details Long-term trends in radiation damage of Chandra X-ray CCDs Long-term trends in radiation damage of Chandra X-ray CCDs

2005-09-01

arxiv.org/abs/astro-ph/0509035v1

Astronomy and Astrophysics

Astrophysics

10 pages, 14 figures to appear in Proc. SPIE vol. 5898 "UV, X-ray, and Gamma-Ray Space Instrumentation for Astronomy XIV"

Scientific paper

10.1117/12.618123

Soon after launch, the Advanced CCD Imaging Spectrometer (ACIS), one of the focal plane instruments on the Chandra X-ray Observatory, suffered radiation damage from exposure to soft protons during passages through the Earth's radiation belts. Current operations require ACIS to be protected during radiation belt passages to prevent this type of damage, but there remains a much slower and more gradual increase. We present the history of ACIS charge transfer inefficiency (CTI), and other measures of radiation damage, from January 2000 through June 2005. The rate of CTI increase is low, of order 1e-6 per year, with no indication of step-function increases due to specific solar events. Based on the time history and CCD location of the CTI increase, we speculate on the nature of the damaging particles.

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