Accession Number : AD0283101

Title :   SURVEY OF CLOSED-CYCLE HELIUM-TEMPERATURE REFRIGERATORS

Corporate Author : MARTIN CO BALTIMORE MD

Personal Author(s) : JACOBS, J.A.H.

Report Date : 24 MAY 1962

Pagination or Media Count : 1

Abstract : A superconducting delay line which must be operated at a temperature of 4.2 K is being developed. It is the purpose of this survey to report on available closed-cycle refrigeration systems which can supply sufficient refrigeration to cool the delay line and in which the delay line can be installed with minimum refrigerator modification. At present, the heat leak to the delay lines does not exceed 50 mw and therefore, taking a factor of four for the margin of safety, a minimum cooling capacity of 200 mw is required. This provides for a faster cool-down time and allows for future modifications (such as an increased number of taps) which might increase the heat leak to the line. As for the physical requirement, a cylindrical space of 3-in. diameter and 4-in. length will be adequate. It was found that three manufacturers are presently producing systems capable of achieving the desired temperature and of supplying the necessary cooling. All of these appear readily adaptable to the cooling of the Martin superconducting delay line. (Author)

Descriptors :   *DELAY LINES, *REFRIGERATION SYSTEMS, FLUID MECHANICS, FRICTION, GAS LEAKS, HEAT TRANSFER, HELIUM, IRREVERSIBLE PROCESSES, JOULE-THOMPSON EFFECT, PRODUCTION, REGENERATION, SUPERCONDUCTORS, THEORY, THERMODYNAMICS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE