WFC3 UVIS Bowtie Monitor

Details WFC3 UVIS Bowtie Monitor WFC3 UVIS Bowtie Monitor

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11808m&link_type=abstract

HST Proposal ID #11808. Cycle 17

Physics

Scientific paper

The UVIS detector was observed during ground testing to occasionally exhibit flat field and dark variations with a bowtie pattern. These variations are most significant as 1% flat field {gain} variations across the field of view. It is believed that this represents a state or condition into which the detector can transition for reasons and under circumstances which are not currently understood. It is also very unlikely that most science observations will determine the state {bowtie or no-bowtie} of the detector. Ground test data indicates that this state is long lived {many hours to one day}. Hysteresis or memory of past light exposure is also associated with this state. Recent evidence suggests that exposing the detector to 200k to 500k electrons may quench this state. This proposal obtains an internal flat field sequence of three exposures: one at 10x full well with two at 0.5x full well immediately before and after. Each exposure is 3x3 binned to reduce the data volume required. These visits should be scheduled 2x per day until further direction is provided.;

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