Other
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007wfc..rept...26m&link_type=abstract
Instrument Science Report WFC3 2007-026, 12 pages
Other
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Thermal Vacuum 2, Tv2, Uvis-2, Dark Frames
Scientific paper
WFC3 underwent its second thermal vacuum testing in the Space Environment Simulation Chamber at the Goddard Space Flight Center over the summer and fall of 2007. Throughout this campaign, dark frames were acquired for the spare UVIS-2 detector at several operating temperatures. In all the long dark frames (3000 sec), a "hot" spot is detected at the top of the A and B quadrants. The dark rate at -81.6 C (gain=1.5 e-/DN) is ~0.1 e-/hour/pix and at -78.2 C (gain=1 e-/DN), ~ 0.55 e-/hour/pix. The AB chip has a higher dark current rate and a greater fraction of hot pixels than the CD chip, by factors of 1.6 and 1.2 respectively. Quadrant B exhibits the worse behavior: it has the highest dark current rate, the largest fraction of hot pixels, and the highest mean hot pixel rate, more than twice the rate of the other quadrants. Quadrant C has the lowest dark rates. The dark current rates are consistent with the well-known dark current equation from -81.6 C to -3.6 C. The dark current rate easily meets the CEI specification for temperatures colder than -54 C.
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