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Proceedings Paper

Managing radiation degradation of CCDs on the Chandra X-ray Observatory III
Author(s): Stephen L. O'Dell; Thomas L. Aldcroft; William C. Blackwell; Sabina L. Bucher; Jon H. Chappell; Joseph M. DePasquale; Catherine E. Grant; Michael Juda; Eric R. Martin; Joseph I. Minow; Stephen S. Murray; Paul P. Plucinsky; Daniel A. Schwartz; Daniel P. Shropshire; Bradley J. Spitzbart; Paul R. Viens; Scott J. Wolk
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Paper Abstract

Soon after the start of science operations of the Chandra X-ray Observatory, it became apparent that weakly penetrating (0.1-0.5 MeV) protons in the Earth's radiation belt were causing an unexpectedly rapid increase in the charge-transfer inefficiency of Chandra's front-illuminated CCDs. Fortunately, the Chandra team developed, implemented, and maintains a radiation-protection program that successfully reduced the rate of degradation of the CCDs' performance to acceptable levels. Since implementing this program, the average rate of increase of the charge-transfer inefficiency has slowed to 3.2×10-6/y (2.3%/y) for the front-illuminated CCDs and 1.0×10-6/y (5.8%/y) for the back-illuminated CCDs. This paper reviews the Chandra radiation-management program, reports the current status, and describes changes planned or implemented since the previous paper on this topic.

Paper Details

Date Published: 18 September 2007
PDF: 12 pages
Proc. SPIE 6686, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV, 668603 (18 September 2007); doi: 10.1117/12.734594
Show Author Affiliations
Stephen L. O'Dell, NASA Marshall Space Flight Ctr. (United States)
Thomas L. Aldcroft, Harvard-Smithsonian Ctr. for Astrophysics (United States)
William C. Blackwell, Jacobs Sverdrup (United States)
Sabina L. Bucher, Northrop Grumman Space Technology (United States)
Jon H. Chappell, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Joseph M. DePasquale, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Catherine E. Grant, Massachusetts Institute of Technology (United States)
Michael Juda, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Eric R. Martin, Jacobs Sverdrup (United States)
Joseph I. Minow, NASA Marshall Space Flight Ctr. (United States)
Stephen S. Murray, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Paul P. Plucinsky, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel A. Schwartz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel P. Shropshire, Jacobs Sverdrup (United States)
Bradley J. Spitzbart, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Paul R. Viens, Jacobs Sverdrup (United States)
Scott J. Wolk, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 6686:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV
Oswald H.W. Siegmund, Editor(s)

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