Interim ACS HRC internal CTE monitor

Details Interim ACS HRC internal CTE monitor Interim ACS HRC internal CTE monitor

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9569m&link_type=abstract

HST Proposal ID #9569

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Hst Proposal Id #9569

Scientific paper

The charge transfer efficiency {CTE} of the ACS CCD detectors will decline as damage due to on-orbit radiation exposure accumulates. This degradation will be closely monitored at regular intervals, because it is likely to determine the useful lifetime of the CCDs. This program is part of a pair of internal ACS CTE programs {one each for WFC and HRC} which should be executed within a week or two of each other. All the data is acquired using internal targets {lamps} only, so all of the exposures should be taken during Earth occultation time {but not during SAA passages}. These programs emulate the ACS pre-flight ground calibration and post-launch SMOV testing, 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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