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|a La Marr, Beverly J.
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Bautz, Marshall W.
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|a Grant, Catherine E.
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|a La Marr, Beverly J.
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|a Bautz, Marshall W.
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|a Bautz, Marshall W.
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|a O'Dell, S. L.
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|a Grant, Catherine E
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|a Using ACIS on the Chandra X-ray Observatory as a particle radiation monitor
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|b SPIE,
|c 2011-03-09T14:45:03Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/61635
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|a 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.
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|a United States. National Aeronautics and Space Administration (NASA) (Contract NAS 8-37716)
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|a United States. National Aeronautics and Space Administration (NASA) (Contract NAS 8-38252)
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|a Article
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|t Proceedings of SPIE--the International Society for Optical Engineering
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