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Proceedings Paper

Managing radiation degradation of CCDs on the Chandra X-ray Observatory II
Author(s): Stephen L. O'Dell; Thomas L. Aldcroft; Bradley A. Bissell; William C. Blackwell; Robert A. Cameron; Jon H. Chappell; Joseph M. DePasquale; Kenneth R. Gage; Catherine E. Grant; Christine F. Harbison; Michael Juda; Kevin A. Marsh; Eric R. Martin; Joseph I. Minow; Stephen S. Murray; Paul P. Plucinsky; Daniel A. Schwartz; Daniel P. Shropshire; Bradley J. Spitzbart; Shanil N. Virani; Brent S. Williams; Scott J. Wolk
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Paper Abstract

The CCDs on the Chandra X-ray Observatory are vulnerable to radiation damage from low-energy protons scattered off the telescope's mirrors onto the focal plane. Following unexpected damage incurred early in the mission, the Chandra team developed, implemented, and maintains a radiation-protection program. This program - involving scheduled radiation safing during radiation-belt passes, intervention based upon real-time space-weather conditions and radiation-environment modeling, and on-board radiation monitoring with autonomous radiation safing - has successfully managed the radiation damage to the CCDs. Since implementing the program, the charge-transfer inefficiency (CTI) has increased at an average annual rate of only 3.2×10-6 (2.3%) for the front-illuminated CCDs and 1.0×10-6 (6.7%) for the back-illuminated CCDs. This paper describes the current status of the Chandra radiation-management program, emphasizing enhancements implemented since the original paper.

Paper Details

Date Published: 18 August 2005
PDF: 12 pages
Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58980R (18 August 2005); doi: 10.1117/12.619442
Show Author Affiliations
Stephen L. O'Dell, NASA Marshall Space Flight Ctr. (United States)
Thomas L. Aldcroft, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Bradley A. Bissell, Northrop Grumman Space Technology (United States)
William C. Blackwell, Jacobs Sverdrup, Sverdrup/MSFC (United States)
Robert A. Cameron, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jon H. Chappell, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Joseph M. DePasquale, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Kenneth R. Gage, Northrop Grumman Space Technology (United States)
Catherine E. Grant, MIT Kavli Institute for Astrophysics and Space Research (United States)
Christine F. Harbison, Northrop Grumman Space Technology (United States)
Michael Juda, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Kevin A. Marsh, Northrop Grumman Space Technology (United States)
Eric R. Martin, Northrop Grumman Space Technology (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, Northrop Grumman Space Technology (United States)
Bradley J. Spitzbart, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Shanil N. Virani, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Brent S. Williams, Northrop Grumman Space Technology (United States)
Scott J. Wolk, Harvard-Smithsonian Ctr. for Astrophysics (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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