Sacrificial charge and the spectral resolution performance of the Chandra advanced CCD imaging spectrometer

Catherine E. Grant; Gregory Y. Prigozhin; Beverly LaMarr; Mark W. Bautz

doi:10.1117/12.461282

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11 March 2003 Sacrificial charge and the spectral resolution performance of the Chandra advanced CCD imaging spectrometer

Catherine E. Grant; Gregory Y. Prigozhin; Beverly LaMarr; Mark W. Bautz

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Proceedings Volume 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy; (2003) https://doi.org/10.1117/12.461282
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

Soon after launch, the Advanced CCD Imaging Spectrometer (ACIS), one of the focal plane instruments on the Chandra X-ray Observatory, suffered radiation damage from exposure to soft protons during passages through the Earth's radiation belts. The ACIS team is continuing to study the properties of the damage with an emphasis on developing techniques to mitigate charge transfer inefficiency (CTI) and spectral resolution degradation. A post-facto CTI corrector has been developed which can effectively recover much of the lost resolution. Any further improvements in performance will require knowledge of the location and amount of sacrificial charge - charge deposited along the readout path of an event which fills electron traps and changes CTI. We report on efforts by the ACIS Instrument team to characterize which charge traps cause performance degradation and the properties of the sacrificial charge seen on-orbit. We also report on attempts to correct X-ray pulseheights for the presence of sacrificial charge.

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Catherine E. Grant, Gregory Y. Prigozhin, Beverly LaMarr, and Mark W. Bautz "Sacrificial charge and the spectral resolution performance of the Chandra advanced CCD imaging spectrometer", Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); https://doi.org/10.1117/12.461282

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