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Proceedings Paper

Using ACIS on the Chandra X-ray Observatory as a particle radiation monitor II
Author(s): C. E. Grant; P. G. Ford; M. W. Bautz; S. L. O'Dell
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Paper Abstract

The Advanced CCD Imaging Spectrometer is an instrument on the Chandra X-ray Observatory. CCDs are vulnerable to radiation damage, particularly by soft protons in the radiation belts and solar storms. The Chandra team has implemented procedures to protect ACIS during high-radiation events including autonomous protection triggered by an on-board radiation monitor. Elevated temperatures have reduced the effectiveness of the on-board monitor. The ACIS team has developed an algorithm which uses data from the CCDs themselves to detect periods of high radiation and a flight software patch to apply this algorithm is currently active on-board the instrument. In this paper, we explore the ACIS response to particle radiation through comparisons to a number of external measures of the radiation environment. We hope to better understand the efficiency of the algorithm as a function of the flux and spectrum of the particles and the time-profile of the radiation event.

Paper Details

Date Published: 17 September 2012
PDF: 10 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 844311 (17 September 2012); doi: 10.1117/12.925467
Show Author Affiliations
C. E. Grant, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology (United States)
P. G. Ford, 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. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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