Paper
18 August 2005 Managing radiation degradation of CCDs on the Chandra X-ray Observatory II
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
Author Affiliations +
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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and Scott J. Wolk "Managing radiation degradation of CCDs on the Chandra X-ray Observatory II", Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 58980R (18 August 2005); https://doi.org/10.1117/12.619442
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KEYWORDS
Charge-coupled devices

Sensors

Solar processes

X-rays

Magnetosphere

Observatories

Space operations

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