Development testing of the cryogenic capillary pumped loop

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Cryogenics, Refrigerators, Low-Temperature Detectors, And Other Low-Temperature Equipment

Scientific paper

This paper describes the continuing development of a promising new technology, a capillary pumped loop (CPL) which operates at cryogenic temperatures. While cryogenic capillary pumped loops have application to passive spacecraft radiators and to long term storage of cryogenic propellants and open-cycle coolants, their application to the integration of spacecraft cryocoolers has generated the most excitement. Without moving parts or complex controls, they are able to thermally connect redundant cryocoolers to a single remote load, eliminating thermal switches and providing mechanical isolation at the same time. The development of the cryogenic CPL presented some unique challenges such as start-up from a super-critical state and management of parasitic heat leaks. This paper describes this new technology and presents the results of continuing development testing.

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