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An adiabatic demagnetization refrigerator for SIRTFAn adiabatic demagnetization refrigerator (ADR) has been proposed to cool bolometric infrared detectors on the multiband imaging photometer of the Space Infrared Telescope Facility (SIRTF). One such refrigerator has been built which uses a ferric ammonium alum salt pill suspended by nylon threads in a 3-T solenoid. The resonant modes of this suspension are above 100 Hz. The heat leak to the salt pill is less than 0.5 microW. The system has a hold time at 0.1K of more than 12 h. The cold stage temperature is regulated with a feedback loop that controls the magnetic field. A second, similar refrigerator is being built at a SIRTF prototype to fly on a ballon-borne telescope. It will use a ferromagnetic shield. The possibility of using a high-Tc solenoid-actuated heat switch is also discussed.
Document ID
19890048372
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Timbie, P. T.
(California Univ. Berkeley, CA, United States)
Bernstein, G. M.
(California Univ. Berkeley, CA, United States)
Richards, P. L.
(California, University Berkeley, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1989
Publication Information
Publication: IEEE Transactions on Nuclear Science
Volume: 36
ISSN: 0018-9499
Subject Category
Engineering (General)
Accession Number
89A35743
Funding Number(s)
CONTRACT_GRANT: NAS2-12578
Distribution Limits
Public
Copyright
Other

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