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Proceedings Paper

Radiation environment of the Chandra X-Ray Observatory
Author(s): Stephen L. O'Dell; Mark W. Bautz; William C. Blackwell; Yousaf M. Butt; Robert A. Cameron; Ronald F. Elsner; M. Susan Gussenhoven; Jeffery J. Kolodziejczak; Joseph I. Minow; Robert M. Suggs; Douglas A. Swartz; Allyn F. Tennant; Shanil N. Virani; Kevin M. Warren
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Paper Abstract

The Chandra X-ray Observatory, the x-ray component of NASA's Great Observatories, provides unprecedented subarcsecond imaging, imaging spectrometry, and high-resolution dispersive spectroscopy of cosmic x-ray sources. During the initial phase of operation, some of the focal-plane charge-coupled devices (CCDs) -- namely, the front-illuminated devices -- experienced an unanticipated increase in charge-transfer inefficiency (CTI). Investigation of this anomaly determined the root cause to be radiation damage by weakly penetrating protons, entering the telescope's aperture and scattered off the mirrors into the focal plane. Subsequent changes in operating procedures have slowed the rate of increase of the CTI of the front- illuminated CCDs to acceptable levels. There has been no measurable degradation of the back-illuminated CCDs.

Paper Details

Date Published: 13 December 2000
PDF: 12 pages
Proc. SPIE 4140, X-Ray and Gamma-Ray Instrumentation for Astronomy XI, (13 December 2000); doi: 10.1117/12.409104
Show Author Affiliations
Stephen L. O'Dell, NASA Marshall Space Flight Ctr. (United States)
Mark W. Bautz, Massachusetts Institute of Technology (United States)
William C. Blackwell, Sverdrup Technology, Inc. (United States)
Yousaf M. Butt, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Robert A. Cameron, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Ronald F. Elsner, NASA Marshall Space Flight Ctr. (United States)
M. Susan Gussenhoven, Air Force Research Lab. (United States)
Jeffery J. Kolodziejczak, NASA Marshall Space Flight Ctr. (United States)
Joseph I. Minow, Sverdrup Technology, Inc. (United States)
Robert M. Suggs, NASA Marshall Space Flight Ctr. (United States)
Douglas A. Swartz, Universities Space Research Association (United States)
Allyn F. Tennant, NASA Marshall Space Flight Ctr. (United States)
Shanil N. Virani, Harvard-Smithsonian Ctr. for Astrophyscis (United States)
Kevin M. Warren, Raytheon ITSS (United States)


Published in SPIE Proceedings Vol. 4140:
X-Ray and Gamma-Ray Instrumentation for Astronomy XI
Kathryn A. Flanagan; Oswald H. W. Siegmund, Editor(s)

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