Computer Science
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11046c&link_type=abstract
HST Proposal ID #11046. Cycle 15
Computer Science
Scientific paper
Hot pixel annealing will continue to be performed once every 4 weeks. The CCD TECs will be turned off and heaters will be activated to bring the detector temperatures to about +20C. This state will be held for approximately 6 hours, after which the heaters are turned off, the TECs turned on, and the CCDs returned to normal operating condition. To assess the effectiveness of the annealing, a bias and four dark images will be taken before and after the annealing procedure for both WFC and HRC. The HRC darks are taken in parallel with the WFC darks. The charge transfer efficiency CTE of the ACS CCD detectors declines as damage due to on-orbit radiation exposure accumulates. This degradation has been closely monitored at regular intervals, because it is likely to determine the useful lifetime of the CCDs. We combine the annealling activity with the charge transfer efficiency monitoring and also merge into the routine dark image collection. To this end, the CTE monitoring exposures have been moved into this proposal . All the data for this program is acquired using internal targets lamps only, so all of the exposures should be taken during Earth occultation time but not during SAA passages. This program emulates the ACS pre-flight ground calibration and post-launch SMOV testing program 8948, so that results from each epoch can be directly compared. Extended Pixel Edge Response EPER and First Pixel Response FPR data will be obtained over a range of signal levels for both the Wide Field Channel WFC, and the High Resolution Channel HRC.
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