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A compact 2.5-Kelvin closed-cycle refrigeratorA helium refrigerator utilizing the Gifford-McMahon/Joule-Thomson cycle was designed and tested to demonstrate the feasibility of using small closed-cycle refrigerators as an alternative to batch filled-cryostats for operating temperatures below 4 K. The systems could be used to cool low-noise microwave maser amplifiers located in large parabolic antennas. These antennas tilt vertically, making conventional liquid-filled dewars difficult to use. The system could also be used for a nontilting beam waveguide antenna to reduce the helium consumption of a liquid helium cryostat. The prototype system is adjustable to provide 700 milliwatts of cooling at 2.5 K to 3 watts at 4.3 K. The performance of the unit is not significantly affected by operation in any physical orientation.
Document ID
19920030767
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Britcliffe, Mike
(JPL Pasadena, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Engineering (General)
Meeting Information
Meeting: 1989 Cryogenic Engineering Conference
Location: Los Angeles, CA
Country: United States
Start Date: July 24, 1989
End Date: July 28, 1989
Accession Number
92A13391
Distribution Limits
Public
Copyright
Other

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