Correcting for the Temperature Dependence of ACIS Charge Transfer Inefficiency

Details Correcting for the Temperature Dependence of ACIS Charge Transfer Inefficiency Correcting for the Temperature Dependence of ACIS Charge Transfer Inefficiency

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4024p&link_type=abstract

American Astronomical Society, HEAD meeting #11, #40.24

Computer Science

Performance

Scientific paper

The spectral resolution of the ACIS CCDs is substantially improved by a charge transfer inefficiency (CTI) correction algorithm included in acis_process_events. However, the behavior of the charge traps that cause CTI is temperature dependent: warmer-than-nominal focal plane temperatures reduce the effectiveness of the correction algorithm. As the insulation on the exterior of the SIM and the ACIS radiator shade have aged, the surfaces around the ACIS focal plane and radiator have become warmer, leading to FP temperatures which are sometimes a few degrees warmer than desired, particularly for observations done at spacecraft pitch angles greater than 140 degrees. The ACIS team successfully reduced average focal plane temperatures by shutting off the detector housing heater in April 2008 and a heater on the SIM was turned off in August 2009 providing additional margin, but many warm observations exist in the archive, and observations done at "tail-Sun" attitudes still often have warm focal plane temperatures. Here we review the temperature dependence of ACIS performance and present a temperature-dependent CTI correction algorithm, which we have implemented as contributed software designed to work with current CALDB products and CIAO tools. We show examples using this software to CTI-correct warm ACIS observations.

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