A modular dewar design and detector mounting strategy for large-format, astronomical CCD mosaics

Details A modular dewar design and detector mounting strategy for large-format, astronomical CCD mosaics A modular dewar design and detector mounting strategy for large-format, astronomical CCD mosaics

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..215l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, March 1992, p. 215-222. Research supported by Univ

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Charge Coupled Devices, Design Analysis, Mosaics, Telescopes, Cameras, Computer Aided Design, Liquid Nitrogen

Scientific paper

A mechanical design for a very-large-format, 4096 x 4096 pixel CCD mosaic constructed from a 2 x 2 array of two-edge-abuttable, 15-micron pixel 2048 x 2048 CCDs is presented. The advanced manufacturing techniques are described that are used to fabricate the package and mounting structure so that the assembled mosaic is flat, and the rows and columns of the individual quadrants are aligned. The design for a modular dewar built to house the 4096 x 4096 CCD mosaic is described. The dewar splits into two parts - a camera head housing the mosaic array, and a cryogenic back containing a 3-liter capacity liquid-nitrogen (LN2) can, the associated LN2 fill and vent structures, and the vacuum connections. The dewar can be used in any orientation with nearly full LN2 capacity, by simply inserting a vent extension tube for look-up applications. With a fully wired 4096 x 4096 mosaic installed and operating at -100C, the dewar's hold time exceeds 24 hr.

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