Computer Science – Performance
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..343s&link_type=abstract
"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me
Computer Science
Performance
1
Gaia, Ccds
Scientific paper
The astrometric focal plane will have an area of almost 0.5 m2 and will contain 170 CCDs. These will be operated in TDI mode in order to track and observe stars from both telescope viewing directions simultaneously. Gaia's target for astrometric precision of a few millionths of an arc second, places extreme demands on the focal plane thermo-mechanical stability and electronic performance. The CCDs themselves are large area, back illuminated, full-frame, four phase devices. They require maximum efficiency for observing the majority of objects, yet must simultaneously be able to handle very bright objects that will regularly cross the field of view. Achieving the final astrometric precision will also require excellent noise performance and MTF. In addition to demanding state of the art performance from each CCD, they will need to be produced in large numbers which raises production and yield issues. When analyzing Gaia data it will be essential to fully understand CCD behaviour, including the expected performance degradation due to radiation damage. This will be addressed through comprehensive testing and the development of detailed CCD models.
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