3 He Refrigerator Based on Closed Cycle Cryocooler Cooling

A. N. Chernikov; Черников А. Н.

doi:10.31857/S1028096023040040

³He Refrigerator Based on Closed Cycle Cryocooler Cooling

Authors: Chernikov A.N.¹
Affiliations:
1. Joint Institute for Nuclear Research
Issue: No 4 (2023)
Pages: 77-82
Section: Articles
URL: https://journals.rcsi.science/1028-0960/article/view/137742
DOI: https://doi.org/10.31857/S1028096023040040
EDN: https://elibrary.ru/KBSFHP
ID: 137742

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Abstract
About the authors
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Abstract

In the Laboratory of Neutron Physics of the Joint Institute for Nuclear Research, work is underway to create gaseous neutron detectors. To prepare a working mixture of gases, it is necessary to use pure ³He, which is obtained by freezing impurities. The ³He refrigerator was created for this purpose. The refrigerator can also be used to obtain low temperatures in a physics experiment. In this work, the operating modes of the refrigerator are studied. In the continuous mode of ³He circulation, a temperature of 0.78 K was obtained. When ³He vapor is pumped out by an external pump in a single cooling mode, a temperature of 0.52 K is reached. We also study relaxation modes in which, with pre-condensed ³He, the volume of the container plays the role of a pump. A regime is presented in which the temperature of the evaporator relaxes from 1 to 1.5 K within 11 days.

Keywords

ultralow temperatures, helium-3, cryocoolers, activated carbon pump.

About the authors

A. N. Chernikov

Joint Institute for Nuclear Research

Author for correspondence.
Email: chern@nf.jinr.ru
Russia, 141980, Moscow region, Dubna

References

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