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Title: Helium dilution refrigeration system

Abstract

A helium dilution refrigeration system operable over a limited time period, and recyclable for a next period of operation is disclosed. The refrigeration system is compact with a self-contained pumping system and heaters for operation of the system. A mixing chamber contains [sup 3]He and [sup 4]He liquids which are precooled by a coupled container containing [sup 3]He liquid, enabling the phase separation of a [sup 3]He rich liquid phase from a dilute [sup 3]He-[sup 4]He liquid phase which leads to the final stage of a dilution cooling process for obtaining low temperatures. The mixing chamber and a still are coupled by a fluid line and are maintained at substantially the same level with the still cross sectional area being smaller than that of the mixing chamber. This configuration provides maximum cooling power and efficiency by the cooling period ending when the [sup 3]He liquid is depleted from the mixing chamber with the mixing chamber nearly empty of liquid helium, thus avoiding unnecessary and inefficient cooling of a large amount of the dilute [sup 3]He-[sup 4]He liquid phase. 2 figs.

Inventors:
;
Issue Date:
OSTI Identifier:
7161790
Patent Number(s):
4770006 A
Application Number:
PPN: US 7-045886
Assignee:
Arch Development Corp., Chicago, IL (United States) PTO; EDB-94-119436
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Patent
Resource Relation:
Patent File Date: 1 May 1987
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; HELIUM DILUTION REFRIGERATORS; DESIGN; CRYOGENIC FLUIDS; HELIUM DILUTION REFRIGERATION; HELIUM II; COOLING; EVEN-EVEN NUCLEI; FLUIDS; HELIUM 4; HELIUM ISOTOPES; ISOTOPES; LIGHT NUCLEI; NUCLEI; QUANTUM FLUIDS; REFRIGERATION; REFRIGERATORS; STABLE ISOTOPES; 661210* - Cryogenics- (1992-)

Citation Formats

Roach, P.R., and Gray, K.E. Helium dilution refrigeration system. United States: N. p., 1988. Web.
Roach, P.R., & Gray, K.E. Helium dilution refrigeration system. United States.
Roach, P.R., and Gray, K.E. Tue . "Helium dilution refrigeration system". United States.
@article{osti_7161790,
title = {Helium dilution refrigeration system},
author = {Roach, P.R. and Gray, K.E.},
abstractNote = {A helium dilution refrigeration system operable over a limited time period, and recyclable for a next period of operation is disclosed. The refrigeration system is compact with a self-contained pumping system and heaters for operation of the system. A mixing chamber contains [sup 3]He and [sup 4]He liquids which are precooled by a coupled container containing [sup 3]He liquid, enabling the phase separation of a [sup 3]He rich liquid phase from a dilute [sup 3]He-[sup 4]He liquid phase which leads to the final stage of a dilution cooling process for obtaining low temperatures. The mixing chamber and a still are coupled by a fluid line and are maintained at substantially the same level with the still cross sectional area being smaller than that of the mixing chamber. This configuration provides maximum cooling power and efficiency by the cooling period ending when the [sup 3]He liquid is depleted from the mixing chamber with the mixing chamber nearly empty of liquid helium, thus avoiding unnecessary and inefficient cooling of a large amount of the dilute [sup 3]He-[sup 4]He liquid phase. 2 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {9}
}