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Proceedings Paper

Long-term trends in radiation damage of Chandra x-ray CCDs
Author(s): C. E. Grant; M. W. Bautz; S. M. Kissel; B. LaMarr; G. Y. Prigozhin
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Paper Abstract

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.

Paper Details

Date Published: 30 August 2005
PDF: 11 pages
Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58980Q (30 August 2005); doi: 10.1117/12.618123
Show Author Affiliations
C. E. Grant, Massachusetts Institute of Technology (United States)
M. W. Bautz, Massachusetts Institute of Technology (United States)
S. M. Kissel, Massachusetts Institute of Technology (United States)
B. LaMarr, Massachusetts Institute of Technology (United States)
G. Y. Prigozhin, Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 5898:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV
Oswald H. W. Siegmund, Editor(s)

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