ACS CTE

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ACS charge transfer efficiency (CTE)

The charge transfer efficiency (CTE) of the ACS CCDs (WFC and HRC) is declining as damage from the space radiation environment accumulates. Here we provide information about our efforts to monitor CTE, and methods of mitigating and calibrating it.

Reports

June 2008 - Preview of New CTE Correction Formulae for ACS/WFC and ACS/HRC From Upcoming ISR by M. Chiaberge et al. (in preparation)
Time Dependence of ACS WFC CTE Corrections for Photometry and Future Predictions (ACS ISR 04-06)
Internal monitoring of ACS CTE (ACS ISR 05-03), and continuously updated plots
Elevated temperature measurements of ACS CTE (ACS ISR 04-04)
ACS CTE poster for AAS Meeting, January 2003
WFC radiation test (ACS ISR 00-09)
Justification for onboard FPR/EPER CTE calibration (ACS TIR 99-03)

Monitoring

Internal (EPER/FPR) CTE programs:
8948, 9649, 9707, 10044, 10369 (see PDF), 10370
External (47 Tuc) CTE programs:
9648, 10043, 10368

CTE Working Group (1999-2000)

Group membership and charter
Workshop at STScI in January 2000
Reference Library
HST CTE in the second decade (WFC3 ISR 2001-05)

ACS CTE OPRs

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ACS charge transfer efficiency (CTE)

Reports

Monitoring

CTE Working Group (1999-2000)

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