1. Design and construction of a 1.8 K superfluid 4He system with a G-M cryocooler
- Author
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Wei Wang, Dong Xu, Shen Fuzhi, Li Xu, Laifeng Li, Arata Nishimura, Huiming Liu, and Peng Lin
- Subjects
010302 applied physics ,Materials science ,Continuous operation ,Nuclear engineering ,General Physics and Astronomy ,Cryocooler ,Cooling capacity ,01 natural sciences ,law.invention ,Superfluidity ,law ,0103 physical sciences ,Vacuum pump ,General Materials Science ,Gas cylinder ,010306 general physics ,Condenser (heat transfer) ,Superfluid helium-4 - Abstract
This paper describes a superfluid 4He (He II) production system with a G-M cryocooler developed to supply continuous cooling capacity for cryogenic devices working below 2 K, such as the sealed-cell lambda-point devices and the photon detectors. Unlike the existing cooling method that injecting and pumping liquid 4He (He I) to cool the devices, high purity 4He gas stored in gas cylinder is firstly liquefied by a G-M cryocooler in the condenser, and then cooled down under 2.17 K at the He II pot through a Joule-Thomson valve along with a dry vacuum pump. This design allows a continuous supplement of He II below 2.17 K by using 4He at ambient temperature, which avoids the temperature oscillation to the devices being cooled when refilling He I. Due to the removing of cryogen injection, no additional cryogenic apparatus and professional operation are required. In this system, the He II pot can reach a temperature below 1.8 K for continuous operation.
- Published
- 2019