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Development of liquid He free dilution refrigerator with Gifford-McMahon refrigerator.

Research Project

Project/Area Number 10554014
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section展開研究
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionTohoku University

Principal Investigator

FUKASE Tetsuo  Tohoku University, Institute for Materials Research, Professor, 金属材料研究所, 教授 (90005900)

Co-Investigator(Kenkyū-buntansha) NOJIMA Tsutomu  Tohoku University, Low Temperature Center, Associate Professor, 極低温科学センター, 助教授 (80222199)
SASAKI Takahiko  Tohoku University, Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (20241565)
KOBAYASHI Norio  Tohoku University, Institute for Materials Research, Professor, 金属材料研究所, 教授 (40111306)
KAMIOKA Yasuharu  Taiyo Toyo Sanso Co.Ltd., Low Temperature Division, Head Researcher, BMEP超低温事業部, 研究主幹
NAKAMURA Shintaro  Tohoku University, Low Temperature Center, Research Associate, 極低温科学センター, 助手 (20292310)
坂爪 新一  東北大学, 極低温科学センター, 助教授 (20005896)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥9,000,000 (Direct Cost: ¥9,000,000)
KeywordsDilution refrigerator / Gifford-McMahon refrigerator / Ultra low temperature / ジュールトムソン弁
Research Abstract

A ^3He-^4He dilution refrigerator is developed to operate without using liquid helium. A commercial two-stage Gifford-McMahon refrigerator(SRDK-408DA, Sumitomo Heavy Industries, ltd.)is used to cool the dilution unit and the radiation shield of shield of the cryostat. A Joule-Thomson cycle for condensation of the ^3He-^4He gas mixture into the dilution unit is designed to built in the dilution refrigeration process.
1. The GM refrigerator can cool the DR unit down to 3.05K.This low temperature is enough to operate Joule-Thomson cycle and the dilution refrigeration process.
2. A dilution unit with a standard tube-in-tube type heat exchanger and a counter flow type heat exchanger for Joule-Thomson expansion has been made and passed on the helium leak test.
3. Automatic circulation ^3He-^4He gas control system has been made and tested.
4. The dilution unit has been combined with the GM refrigerator. Leak test with helium gas has been passed on several connection parts to the gas control system.
5. Thermometers and electrical heaters are attached to the dilution unit.
6. A condensation process of the mixture gas in a Joule-Thomson cycle is under examination. Final refrigeration test is planed soon just after the condensation test.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report

Research Products

(17 results)

All Other

All Publications (17 results)

  • [Publications] T.Sasaki et al.: "Quantum liquid of vortices in the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)_2Cu(NCS)_2."Phys.Rev.B. 57. 10889-10892 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasaki et al.: "Spin splitting at the high-magnetic-field phase transition of the organic conductor α-(BEDT-TTF)_2KHg(SCN)_4."Phys.Rev.B. 59. 13872-13877 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasaki et al.: "Magnetic torque studies of the organic conductors α-(BEDT-TTF)_2MHg(XCN)_4,[M=K,X=S,Se]."Proceedings of Physical Phenomena at High Magnetic Fields (PPHMF-III). 265-268 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Inada et al.: "First order vortex phase transition in the organic superconductor κ-(BEDT-TTF)_2Cu(NCS)_2"J.Low Temp.Phys.. 117. 1423-1427 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Fujita et al: "Current-voltage characteristics in the density wave state of α-(BEDT-TTF)_2KHg(SCN)_4"Synth.Metals. (印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasaki et al.: "Magnetic torque of λ-(BETS)_2FeCl_4."Synth.Metals. (印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasaki, W.Bibiracher, K.Neumaier, W.Hehn, K.Andres and T.Fukase: "Quantum liquid of vortices in the quasi-two-dimensional organic superconductor κ-(BEDT-TTF)2Cu(NCS)2"Phys.Rev.B. 57. 10889-10892 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasaki and T.Fukase.: "Spin splitting at the high-magnetic-field phase transition of the organic conductor α-(BEDT-TTF)2KHg(SCN)4."Phys.Rev.B. 59. 13872-13877 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasaki and T.Fukase: "Magnetic torque studies of the organic conductors α(BEDT-TTF)2MHg(XCN)4, [M=K, X=S, Se]."Proceedings of Physical Phenomena at High Magnetic Fields(PPHMF-III). 265-268 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Inada, T.Sasaki, T.Nishizaki, N.Kobayashi, S.Yamada and T.Fukase.: "First order vortex phase transition in the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2."J.Low Temp.Phys.. 117. 1423-1427 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Fujita, T.Sasaki, N.Yoneyama, N.Kobayashi and T.Fukase: "Current-voltage characteristics in the density wave state of α-(BEDT-TTF)2KHg(SCN)4."Synth. Metals. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasaki, H.Uozaki, S.Endo and N.Toyota.: "Magnetic torque of λ-(BETS)2FeC14."Synth. Metals. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Fukase et al.: "Elastic Anomalies Induced by Spin-Flop in La_<1.88>Sr_<0.12>CuO_4"Physica B. 284-288. 483-484 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Sasaki et al: "Magnetic torque of λ-(BETS)_2FeCl_4"Synth.Metals(印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Nishizaki et al.: "New equilibrium phase diagram of YBa_2Cu_3O_y under high magnetic fields."Physica C. 341-348. 957-960 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Sasaki and T.Fukase: "Spin splitting at the high-magnetic-field phase transition of the organic conductor α-(BEDT-TTF)_2KH_g(SCN)_4"Physical Review B. 59. 13872-13877 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Inada et al.: "First order vortex phase transition in the organic super conductor X-(BEDT-TTF)_2Cu(NCS)_2"J. Low Temp. Phys.. 117. 1423-1427 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1998-03-31   Modified: 2020-05-15  

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