Magnetostrictive Heat Switch for Cryogenic Use

TBMG-29804

08/01/1999

Abstract
Content

A magnetostrictively actuated heat switch has been proposed for use in a variety of cryogenic equipment, including adiabatic-demagnetization refrigerators, calorimeters, and coolers for high-performance infrared cameras. Heretofore, the heat switches in such equipment have generally been of two types: gas-gap and externally mechanically actuated. The gas-gap switches are limited to long cycle times and tend to exhibit both poor isolation in their "open" states and low "closed"/"open" heat-transfer ratios. In the case of externally mechanically actuated switches, the mechanical connections between the switches and the outside environment are heat-conduction paths, along which heat leaks into the affected cryogenic chambers. In contrast, the proposed magnetostrictively actuated switch would feature short cycle times, low heat leakage, high isolation in the "open" state, and a high "closed"/"open" ratio.

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Citation
"Magnetostrictive Heat Switch for Cryogenic Use," Mobility Engineering, August 1, 1999.
Additional Details
Publisher
Published
Aug 1, 1999
Product Code
TBMG-29804
Content Type
Magazine Article
Language
English