Computer Science – Performance
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007wfc..rept...20b&link_type=abstract
Instrument Science Report WFC3 2007-20, 16 pages
Computer Science
Performance
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Uvis-2, Thermal Vacuum Test
Scientific paper
The UVIS spare detector (UVIS build 2) is currently installed in WFC3 during thermal vaccum ground testing. We have performed testing of the end-to-end system throughput on the UVIS channel, and find that it performs near or better than expectations at most wavelengths. However, the performance in the thermal vacuum environment is lower than that found in the ambient ground testing of this detector earlier this year, for two reasons. First, we find that the long wavelength response of the detector is lower at the detector temperature in thermal vacuum (-78 C, which is close to the on-orbit temperature of -83 C) than it is at the ambient temperature (-54 C). Second, we find that there was non-negligible leak of room light into the optical stimulus fibers when in the ambient test; this leak caused a false enhancement of the throughput at some wavelengths, on the order of several percent. Wrapping of these fibers and operating in the dark thermal vacuum chamber has removed this contamination.
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