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Title: The LSST Camera 500 watt -130 degC Mixed Refrigerant Cooling System

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. (auth)
Authors:
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Publication Date:
OSTI Identifier:
1132852
Report Number(s):
SLAC-PUB-15965
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Contributed to SPIE Astronomical Telescopes + Instrumentation, Montreal, Canada, June 22 - 27, 2014
Research Org:
SLAC National Accelerator Laboratory (SLAC)
Sponsoring Org:
US DOE Office of Science (DOE SC); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 79 ASTRONOMY AND ASTROPHYSICS ENG, INST