Closed-Cycle Refrigeration at 1.85°K

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Abstract
The growing need for refrigeration at temperatures below the boiling point of helium—particularly to maintain superfluid helium in a superconducting linear accelerator for long periods of time—has led to the development of a closed-cycle refrigerator in which the refrigerative powers of the helium vapor at pressures as low as 0.02 atm can be utilized. Effective use of the cold vapor in a heat exchanger makes possible a several-fold increase in the capacity of a refrigerating system, as compared to conventional open-cycle techniques.

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