Physics – Optics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346019g&link_type=abstract
American Astronomical Society, AAS Meeting #213, #460.19; Bulletin of the American Astronomical Society, Vol. 41, p.370
Physics
Optics
Scientific paper
The LSST camera provides a 3.2 Gigapixel focal plane array, tiled by 189 4Kx4K CCD science sensors with 10um pixels. This pixel count is a direct consequence of sampling the 9.6 deg^2 field-of-view (0.64m diameter) with 0.2 arcsec pixels (Nyquist sampling in the best expected seeing of 0.4 arcsec). The sensors are deep depleted, back-illuminated devices with a highly segmented architecture that enables the entire array to be read in 2 seconds. The detectors are grouped into 3x3 rafts, each containing its own dedicated front-end and back-end electronics boards. The rafts are mounted on a silicon carbide grid inside a vacuum cryostat, with an intricate thermal cryostat and the third of the three refractive lenses in the camera. The other two lenses are mounted in an optics structure at the front of the camera body, which also contains a mechanical shutter, and a carousel assembly that holds five large optical filters(ugrizy). A sixth optical filter will also be fabricated and can replace any of the others via procedures accomplished during daylight hours. This poster will illustrate the current mechanical design of the camera, FEA and thermal analysis of the cryostat, and overview of the data acquisition system and the performance characteristics of the filters.
Fouts K.
Gilmore David Kirk
Kahn Sophia
LSST Camera Team
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