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1996 Fiscal Year Final Research Report Summary

Development of Simple Diolution Refrigerators free from Cryogen refilling

Research Project

Project/Area Number 07559016
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field 広領域
Research InstitutionInstitute for Solid State Physics, the University of Tokyo

Principal Investigator

KUBOTA Minoru  Institute for Solid State Physics, the University of Tokyo Assoc.Prof., 物性研究所, 助教授 (60192035)

Co-Investigator(Kenkyū-buntansha) HIRESAKI Yu  Cryogenics Devision, Suzuki Shokan Co.Ltd.Chief Engineer, 低温事業部, 技師長
Project Period (FY) 1995 – 1996
Keywordsdilution refrigerator(DR) / cryogen free refrigerators / milli Kelvins / continuous operation / pulse tube refrigerator below 4K / ultra low temp. / low vibration level / World first Pulse tube refrigerator precoold DR
Research Abstract

Dilution refrigerator is the very low temperature refrigerator continuously operable down to much below 1K and in the extreme case to 2 milli Kelvin [1]. The complication of the machine and the operation often limits the versatility of such a refrigerator covering the wide temperature range over a factor of a few hundred or so, which is essential for basic research in many fields [2].
The first simplification of the refrigerator was brought about by the extinction of the pumped He bath for the condensation of the circulating 3He, instead the enthalpy of the 3He pumped out from the still is utilized in the JT precooling heat exchanger [3]. We have been using a number of JT precooled Dilution Refrigerators and One of them is being used for experiments under world fastest rotation for the fundamental study of physics of quantized vortices for years because of the reliability and the simplicity of the refrigerator [4].
The second important simplification is achieved by the elimination of the cryogen usage. The development of the Cryocoolers enables us to operate a dilution refrigerator without cryogen [5], yet the viblation limits the ultimate low temperature as well as type of experiments.
We have achieved continuously operating dilution refrigeraor which runs over many weeks without reffiling the cryogen while keeping the temperature below 40mK.This was made possible by combination of the hybrid He refrigerator, consists of Gifford McMahon cycle with solid displacer as the 1st stage and a double inlet pulse tube refrigerator as the second with a JT precooled dilution refrigerator which does not have 1K pot nor liq. ^4He bath. Further study of the combination of vibration isolation and good thermal contact is being carried out in order to obtain the condition to perform experiments below 10mK.

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] V.Kovacik, M.Fukuda, T.Igarashi, K.Torizuka, M.K.Zalalutdinov,and M.Kubota,: ""The ISSP Tokyo Rotating Cryostat"" Journal of Low Temp.erature Physics.101,Nos.3/4. 567-572 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kubota, T.Iida, G.Ueno, V.Kovacik, M.Fukuda, T.Yano,and M.Zalalutdinov,: ""Thermal Conductivity Study of Thin He Films Adsorbed in Porous Glasses with Well Controlled Pore Size"." Journal of Low Temp.erature Physics. 101,Nos.1/2. 265-270 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.K.Zalalutdinov, V.Kovacik, M.Fukuda, T.Igarashi,and M.Kubota,: ""Rotation-induced vortices in superfluid 4He films on porous substrate"" Czechoslovak Journal.of Physics. Vol.46 S1. 39-40 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Fukuda, M.K.Zalalutdinov, V.Kovacik, T.Igarashi,and M.Kubota: "AC flow effect on a vortex state in thin 4He superfluid films on porous glass"" Czechoslovak Journal.of Physics. Vol.46,S1. 143-144 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Tanida, J.L.Gao, Y.Hiresaki,and Matsubara: "Performance of the Hybrid Two-Stage Refrigerator" Proc 16th International Cryogenic Engineering Conf. 303-306 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Fukuda, M.K.Zalalutdinov, V.Kovacik, T.Igarashi, T.Obata, K.Ooyama,and M.Kubota: "The Superfluid Transition and Vortex Dynamics in Submonolaye Superfluid 4He Films in Porous Glass under Rotation." Journal of Low Temperature Physics. (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.L.Gao, Y.Hiresaki,and Y.Matsubara.: ""A hybrid Two-Stage Refrigerator Operated at Temperatures Below 4K"," Advances in Cryogenic Engineering,. Vol.41B. 1495-1502 (1996)

    • Description
      「研究成果報告書概要(和文)」より

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Published: 1999-03-16  

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