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Proceedings Paper

Using ACIS on the Chandra X-ray Observatory as a particle radiation monitor
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Paper Abstract

The Advanced CCD Imaging Spectrometer (ACIS) is one of two focal-plane instruments on the Chandra X-ray Observatory. During initial radiation-belt passes, the exposed ACIS suffered significant radiation damage from trapped soft protons scattering off the x-ray telescope's mirrors. The primary effect of this damage was to increase the charge-transfer inefficiency (CTI) of the ACIS 8 front-illuminated CCDs. Subsequently, the Chandra team implemented procedures to remove the ACIS from the telescope's focus during high-radiation events: planned protection during radiation-belt transits; autonomous protection triggered by an on-board radiation monitor; and manual intervention based upon assessment of space-weather conditions. However, as Chandra's multilayer insulation ages, elevated temperatures have reduced the effectiveness of the on-board radiation monitor for autonomous protection. Here we investigate using the ACIS CCDs themselves as a radiation monitor. We explore the 10-year database to evaluate the CCDs' response to particle radiation and to compare this response with other radiation data and environment models.

Paper Details

Date Published: 29 July 2010
PDF: 10 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77322I (29 July 2010); doi: 10.1117/12.857629
Show Author Affiliations
C. E. Grant, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology (United States)
B. LaMarr, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology (United States)
M. W. Bautz, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology (United States)
S. L. O'Dell, NASA Marshall Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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