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A Portable Dilution Refrigerator

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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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Authors and Affiliations

  1. P.L. Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 117334, Russia

    A. V. Ofitserov & V. S. Edel'man

  2. Institut fur angewandte Photonic, Berlin, Germany

    R. Herrmann

  3. Cobra Inter-University Research Institute, Eindhoven University of Technology, Netherlands

    A. V. Ofitserov

  4. Institute of Technology of Microelectronics, Russian Academy of Sciences, Chernogolovka, Russia

    I. N. Khlyustikov

Authors
  1. R. Herrmann
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  2. A. V. Ofitserov
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  3. I. N. Khlyustikov
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  4. V. S. Edel'man
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__________

Translated from Pribory i Tekhnika Eksperimenta, No. 5, 2005, pp. 142–152.

Original Russian Text Copyright © 2005 by Herrmann, Ofitserov, Khlyustikov, Edel'man.

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Herrmann, R., Ofitserov, A.V., Khlyustikov, I.N. et al. A Portable Dilution Refrigerator. Instrum Exp Tech 48, 693–702 (2005). https://doi.org/10.1007/s10786-005-0126-7

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  • DOI: https://doi.org/10.1007/s10786-005-0126-7

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