Temperature dependence of charge transfer inefficiency in Chandra X-ray CCDs

Details Temperature dependence of charge transfer inefficiency in Chandra X-ray CCDs Temperature dependence of charge transfer inefficiency in Chandra X-ray CCDs

2006-06-07

arxiv.org/abs/astro-ph/0606178v1

Astronomy and Astrophysics

Astrophysics

9 pages, 8 figures, to appear in Proc. SPIE vol 6276 "High Energy, Optical, and Infrared Detectors for Astronomy II"

Scientific paper

10.1117/12.672019

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. The primary effect of the damage was to increase the charge transfer inefficiency (CTI) of the eight front illuminated CCDs by more than two orders of magnitude. The ACIS instrument team is continuing to study the properties of the damage with an emphasis on developing techniques to mitigate CTI and spectral resolution degradation. We present the initial temperature dependence of ACIS CTI from -120 to -60 degrees Celsius and the current temperature dependence after more than six years of continuing slow radiation damage. We use the change of shape of the temperature dependence to speculate on the nature of the damaging particles.

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