ACS Internal CTE Monitor
Abstract
This is a continuation of Program 14508 and is to be executed once a cycle for internal CTE.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 monitored twice a cycle to determine the useful lifetime of the CCDs (previous cycles were only monitored once a year). 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) data will be obtained over a range of signal levels for the Wide Field Channel (WFC). The signal levels are 125, 500, 1620, 5000, 10000, and 60000 electrons at gain 2.
- Publication:
-
HST Proposal
- Pub Date:
- August 2017
- Bibcode:
- 2017hst..prop14950R