Instruments and Experimental Techniques

, Volume 48, Issue 5, pp 693–702 | Cite as

A Portable Dilution Refrigerator

  • R. Herrmann
  • A. V. Ofitserov
  • I. N. Khlyustikov
  • V. S. Edel'man
Laboratory Techniques

Abstract

Refrigerating units of two dilution cryostats manufactured in the form of inserts for a commercial portable nitrogen-free cryostat for liquid helium are described. The 3He circulation in both apparatuses is achieved by its evacuation via its condensation on a wall at a temperature of 0.35–0.5 K, which is cooled by the sorption-based evacuation of 3He from a separate bath. One of the apparatuses operates periodically. A temperature below 0.1 K is maintained in it for several hours, after which the sorption pump needs to be regenerated for ∼0.5 h. The other apparatus includes an additional bath with liquid 3He that maintains its circulation during the sorption-pump regeneration thanks to the large specific heat of this liquid. The minimum temperature reached in experiments was 0.035 K. The refrigerators operate at a circulation rate of ∼2–10 µmol/s and consume 1–2 l/day of liquid helium for maintaining their operation. The refrigerators are designed to cool photodetectors or samples in experiments that do not require a high refrigerating capacity.

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Copyright information

© MAIK "Nauka/Interperiodica" 2005

Authors and Affiliations

  • R. Herrmann
    • 2
  • A. V. Ofitserov
    • 1
    • 3
  • I. N. Khlyustikov
    • 4
  • V. S. Edel'man
    • 1
  1. 1.P.L. Kapitza Institute for Physical ProblemsRussian Academy of SciencesMoscowRussia
  2. 2.Institut fur angewandte PhotonicBerlinGermany
  3. 3.Cobra Inter-University Research InstituteEindhoven University of TechnologyNetherlands
  4. 4.Institute of Technology of MicroelectronicsRussian Academy of SciencesChernogolovkaRussia

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