Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001stis.rept....3b&link_type=abstract
Instrument Science Report STIS 2001-003, 9 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph
Scientific paper
Due to a failure of the primary (Side-1) STIS electronics, the STIS has been operating on its redundant (Side-2) electronics since July 2001. Side 2 does not have a functioning temperature sensor for the CCD, and so a constant current is applied to the CCD thermoelectric cooler. Thus, Side-2 operations exhibit a variation in CCD temperature that was not present during Side-1 operations. Fortunately, these variations in temperature can be tracked by a temperature sensor on the CCD housing. In this report, I describe the temperature dependence of the STIS CCD dark rate. For pixels at a given dark rate, the change in rate with temperature is extremely linear over the observed range in CCD housing temperature (approximately 3 oC). However, the change in rate with temperature depends upon the rate itself. Pixels with very low dark rates (<< 0.01 e- s-1) show a 4%/ oC rate variation; moderately hot pixels (0.1 e- s-1) show a 8%/ oC rate variation, while the hottest pixels (> 1 e- s-1) show a 6%/ oC rate variation.
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