18 July 2014 The LSST camera 500-watt -130°C mixed refrigerant cooling system
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Abstract
The LSST Camera has a higher cryogenic heat load than previous CCD telescope cameras due to its large size (634 mm diameter focal plane, 3.2 Giga pixels) and its close coupled front-end electronics operating at low temperature inside the cryostat. Various refrigeration technologies are considered for this telescope/camera environment. MMR-Technology’s Mixed Refrigerant technology was chosen. A collaboration with that company was started in 2009. The system, based on a cluster of Joule-Thomson refrigerators running a special blend of mixed refrigerants is described. Both the advantages and problems of applying this technology to telescope camera refrigeration are discussed. Test results from a prototype refrigerator running in a realistic telescope configuration are reported. Current and future stages of the development program are described.
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Gordon B. Bowden, Gordon B. Bowden, Brian J. Langton, Brian J. Langton, William A. Little, William A. Little, Jacob R. Powers, Jacob R. Powers, Rafe H. Schindler, Rafe H. Schindler, Sam Spektor, Sam Spektor, } "The LSST camera 500-watt -130°C mixed refrigerant cooling system", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91513D (18 July 2014); doi: 10.1117/12.2054990; https://doi.org/10.1117/12.2054990
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