WFC3/UVIS EPER CTE Cycles Aug 2009 - Apr 2016
Abstract
This report summarizes the changes in Charge Transfer Efficiency (CTE) as determined by the Extended Pixel Edge Response (EPER) method. The results are derived from data acquired during Cycle 17 through Cycle 22 (August 2009-present). The EPER method uses large overscan regions obtained via a non-standard readout mode to measure CTE trails as a function of distance from the last row of illuminated science pixels. The CTE decline is steepest at the lowest signal values (160 e- signal level) and more shallow at the highest signal levels (5000 e-). We measure the evolution of CTE since the installation of WFC3; over 7 years the CTE has degraded by 0.07% for the lowest illumination level.
- Publication:
-
Space Telescope WFC Instrument Science Report
- Pub Date:
- May 2016
- Bibcode:
- 2016wfc..rept...10K
- Keywords:
-
- Hubble Space Telescope;
- HST;
- Space Telescope Science Institute;
- STScI;
- WFC3;
- CCD;
- CTE;
- EPER