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DILUTION REFRIGERATOR WITH NO LIQUID-HELIUM SUPPLY.

Author(s) : PARI P.

Type of article: Article

Summary

THE AUTHOR DESCRIBES A HELIUM 3-HELIUM 4 DILUTION REFRIGERATOR WHICH DOES NOT REQUIRE THE USE OF LIQUID-NITROGEN OR LIQUID-HELIUM DEWARS. THE HELIUM 3-HELIUM 4 MIXTURE, COMPRESSED TO 100,000 PASCALS, IS FIRST PRECOOLED TO NEAR 12 K IN A CLOSED-CYCLE REGENERATIVE REFRIGERATOR, THEN COOLED TO NEAR 4.2 K BY A SEPARATE HELIUM 4 COMPRESSION STAGE. THE MIXTURE THEN UNDERGOES A SERIES OF EXPANSIONS AND COOLINGS IN A HEAT EXCHANGER WHICH TAKES THE TEMPERATURE TO BELOW 0.1 K. THE LIMITING STEADY STATE TEMPERATURE IS 70 MILLIK AND THE TOTAL COOL-DOWN TIME IS 20 HOURS.

Details

  • Original title: DILUTION REFRIGERATOR WITH NO LIQUID-HELIUM SUPPLY.
  • Record ID : 1991-1913
  • Languages: English
  • Source: Adv. cryog. Eng. - vol. 35 B
  • Publication date: 1990
  • Document available for consultation in the library of the IIR headquarters only.

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