WFC3 TV3 Testing: UVIS-1' Dark Frames and Rates

Details WFC3 TV3 Testing: UVIS-1' Dark Frames and Rates WFC3 TV3 Testing: UVIS-1' Dark Frames and Rates

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008wfc..rept...23m&link_type=abstract

Instrument Science Report WFC3 2008-23, 13 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wfc3, Wide Field Camera 3, Thermal Vacuum Test, Dark Frames, Dark Current Rates

Scientific paper

WFC3 underwent its third thermal vacuum testing in the Space Environment Simulation Chamber at the Goddard Space Flight Center over a two-month period in the winter and spring of 2008. Throughout this campaign, dark frames were acquired for the UVIS-12 flight detector at several operating temperatures. In this report, we present an analysis of these dark frames. At the nominal on-orbit parameters of -82 C, gain of 1.5 e-/DN and four-amplifier readout, we measure a dark current rate of ~0.23 e-/hour/pix for the AB chip and a slightly higher value of ~0.29 e-/hour/pix for the CD chip. In the long integration dark frames (3000 sec) at -82 C, a "glow" is seen along the lower edge of the C and D quadrants (but along the top edge of the A and B quadrants for binnings of 2x2 and 3x3). At the warmer temperatures (> -49 C), a narrow (width of ~115 pix), horizontal, curved track becomes visible from the center of the left edge of quadrant C out to a spot in quadrant D. The CD chip has a greater fraction of hot pixels than the AB chip, by a factor of 1.2-1.5. The temperature dependence of the dark current rates is consistent with the dark current equation from ~-82 C to ~22 C. The dark current rate meets the CEI specification for temperatures colder than -50 C.

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