Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007stis.rept....2p&link_type=abstract
Instrument Science Report STIS 2007-002, 21 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Fuv Mama, Dark Current
Scientific paper
We describe the long term changes in the STIS FUV MAMA detector's dark current andhot pixels between the initial installation of STIS into HST in 1997 and August 2004, when the failure of the STIS side-2 electronics rendered STIS inoperable. The typical level of thedark current and the number of hot pixels both increased substantially over time. Whilethe low pre-launch measurement of 1.6 x 10Å|6 counts/hi-res-pixel/s persisted in a smallcorner of the detector, much of the FUV MAMA was usually covered by a glow that increased in intensity through each daily SAA free period when the detector was in use.The rate at which the bright glow appeared and intensified increased with time. This glowwas too unpredictable to make removal of a mean glow image in the OTFR pipeline feasible.The number of hot pixels on the FUV MAMA detector had also been increasing overtime. In 1997, only 97 out of the more than 4 million pixels had a dark rate of more than 10Å|4 counts/s. By 2004 about 2500 pixels were at this level. Observational and datareduction strategies for mitigating the effects of the increased dark current and theincreased number of hot pixels are discussed.
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