Minimizing CTE losses in the WFC3 CCDs: Post Flash vs. Charge Injection

Details Minimizing CTE losses in the WFC3 CCDs: Post Flash vs. Charge Injection Minimizing CTE losses in the WFC3 CCDs: Post Flash vs. Charge Injection

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003wfc..rept....1g&link_type=abstract

Instrument Science Report WFC3 2003-01, 25 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3

Scientific paper

We present a comparative study of the relative merits of Post Flash and Charge Injection in mitigating the loss of charge transfer efficiency in the CCDs to be flown on Wide Field Camera 3. The study is based on the observed photometry of the 55Fe X-ray emission, whose photons are recorded on the CCD as individual sources of apperent flux equal to 1,620 e-, equivalent to that from a source with V~26 in ~1/2 hour exposure, and thus our conclusions directly apply to relatively faint observations. Extrapolations to fainter observations are also discussed, based on observations made with WFPC2 and analyzed by Whitmore et al. The primary parameters considered in the comparison are sensitivity and photometric accuracy. We found that the current implementation of Charge Injection for the WFC3 detectors is generally superior to Post Flash in that it allows to obtain generally superior remedial action against the degradation of photometric accuracy and sensitivity induced by losses of charge transfer efficiency while avoiding the high Poisson noise characteristic of Post Flash correction.

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