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Adiabatic demagnetization refrigerator for use in zero gravityIn this effort, a new design concept for an adiabatic demagnetization refrigerator (ADR) that is capable of operation in zero gravity has been developed. The design uses a vortex precooler to lower the initial temperature of magnetic salt from the initial space superfluid helium dewar of 1.8 K to 1.1 K. This reduces the required maximum magnetic field from 4 Tesla to 2 Tesla. The laboratory prototype vortex precooler reached a minimum temperature of 0.78 K, and had a cooling power of 1 mW at 1.1 K. A study was conducted to determine the dependence of vortex cooler performance on system element configuration. A superfluid filled capillary heat switch was used in the design. The laboratory prototype ADR reached a minimum temperature of 0.107 K, and maintained temperatures below 0.125 K for 90 minutes. Demagnetization was carried out from a maximum field of 2 T. A soft iron shield was developed that reduced the radial central field to 1 gauss at 0.25 meters.
Document ID
19930006500
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Dingus, Michael L. (Alabama Cryogenic Engineering, Inc. Huntsville, AL, United States)
Date Acquired
September 6, 2013
Publication Date
June 16, 1988
Subject Category
Materials Processing
Report/Patent Number
NAS 1.26:190864
NASA-CR-190864
Accession Number
93N15689
Funding Number(s)
CONTRACT_GRANT: NAS5-29418
CONTRACT_GRANT: SBIR-08.07-8629
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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