Physics – Optics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cryo...39..975v&link_type=abstract
Cryogenics, Vol. 39, No. 12, p. 975 - 983
Physics
Optics
Cryostats: Space Instrumentation
Scientific paper
The Space Infrared Telescope Facility (SIRTF) is the last of NASA's four great observatories, scheduled for launch in 2001. At the heart of the SIRTF observatory is a 363 l, superfluid helium cryostat. The cryostat houses provides the direct cooling of the three scientific instruments which will observe the infrared universe. One major innovation of the SIRTF observatory is that the instrument optics are launched warm, and cooled down on orbit to the final operating temperature of 5K by radiation to space and direct vapor cooling by the effluent helium. To accomplish this, the cryostat system design includes two cryogenic mechanisms, and must meet stringent cold alignment requirements, in addition to the thermal and mechanical performance requirements typical for space flight cryostats. Currently the cryostat is completing the fabrication and assembly process, and will go into performance testing as a system in the second half of 1999. The authors present here the design requirements, production development of the SIRTF cryostat, and the predicted ground and on-orbit performance.
Gause K.
Pederson Robert
Schweickart Russell
Volz Stephen M.
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