Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept....4m&link_type=abstract
Instrument Science Report WFC3 2009-04, 32 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
During the last thermal vacuum campaign of the fully integrated WFC3 instrument, anomalies in the count levels of IR full-frame exposures and subarrays were found. These manifested themselves as horizontal bands caused by drops of 1.0-2.5 DNs across the width of the second quadrant. From visual inspection of the pair-wise differences of consecutive reads, we find 252 contaminated exposures, all acquired when the instrument was operating on MEB1. The occurrence of the bands does not correlate with sample sequences, number of reads, PDU voltage, or detector temperature. Throughout the campaign, the frequency and morphology of the bands evolved significantly: they became less frequent, narrower, and shallower, until finally disappearing. The thermal environment of the instrument appears to play an important role in the frequency and morphology of the bands. The most severe behavior was observed in a cold operating environment, when ~62% of the exposures or ~5% of the reads in a sequence of continuous darks were found to be contaminated. In orbit, WFC3 will be operated on MEB2 and so no intermittent horizontal bands are expected to affect the second quadrant.
Bushouse Howard
Martel Andre R.
McCullough Peter
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