Publication Date:
2019-07-13
Description:
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.
Keywords:
Instrumentation and Photography
Type:
M12-1930
,
Proceedings of SPIE; 8443|Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray; Jul 01, 2012 - Jul 06, 2012; Amsterdam; Netherlands
Format:
application/pdf
