Development of an Automated System to Test and Select CCDs for the Dark Energy Survey Camera (DECam)

Details Development of an Automated System to Test and Select CCDs for the Dark Energy Survey Camera (DECam) Development of an Automated System to Test and Select CCDs for the Dark Energy Survey Camera (DECam)

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21347901k&link_type=abstract

American Astronomical Society, AAS Meeting #213, #479.01; Bulletin of the American Astronomical Society, Vol. 41, p.446

Astronomy and Astrophysics

Astronomy

Scientific paper

The Dark Energy Survey (DES) is a next generation sky survey aimed directly at understanding why the universe is expanding at an accelerating rate. The survey will use the Dark Energy Camera (DECam), a 3 square degree, 500 Megapixel mosaic camera mounted at the prime focus of the Blanco 4-meter telescope at the Cerro Tololo Inter-American Observatory, to observe 5000 square-degrees of sky through 5 filters (g, r, i, z, Y). DECam will be comprised of 74 CCDs: 62 2k x 4k CCDs for imaging and 12 2k x 2k CCDs for guiding and focus.
The goal of the DES is to provide a factor of 3-5 improvement in the Dark Energy Task Force Figure of Merit using four complementary methods: weak gravitational lensing, galaxy cluster counts, baryon acoustic oscillations, and Type IA supernovae. This goal sets stringent technical requirements for the CCDs.
Testing a large number of CCDs to determine which best meet the DES requirements would be a very time-consuming manual task. We have developed a system to automatically collect and analyze CCD test data. The test results are entered into an online SQL database which facilitates selection of those CCDs that best meet the technical specifications for charge transfer efficiency, linearity, full well, quantum efficiency, noise, dark current, cross talk, diffusion, and cosmetics.

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