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TitleA zero boil-off dewar for use with a cryogenic current comparator
Publication TypeConference Paper
Year of Publication2012
AuthorsLawson, T.B., and Early M.D.
Conference NameCPEM Digest (Conference on Precision Electromagnetic Measurements)
Date Published2012
KeywordsCCCs, cooling, Cryocoolers, Cryogenic current comparator, Cryogenic equipment, Cryogenics, cryorefrigerators, Electromagnetism, Heat leaks, Lakes, Liquefied gases, Liquid helium, Operating points, pulse-tubes, Rf SQUID, Sample space, Sensitive measurement, Shellfish, SQUIDs, Superfluid helium, Tubes (components), Zero boil offs
AbstractWe describe the initial performance of our CCC / SQUID insert with a cryocooled dewar based on a two-stage pulse tube that maintains a pool of liquid helium within a sample space. The heat-leak into the liquid helium pool was calculated at ∼ 180 mW. When the unit was actively cooling, microphonic signals were seen in the SQUID output mostly below 20 kHz, however, the RF SQUID remained stable and locked at its operating point. The cryocooler may be switched off for periods of several hours during sensitive measurements, if necessary. © 2012 IEEE.

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