Numerical and Experimental Study of a 4 K Modified-Solvay Cycle Cryocooler

  • T. Kurihara
  • M. Okamoto
  • K. Sakitani
  • H. Torii
  • H. Morishita
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)


A two-stage 4 K Modified-Solvay cycle cryocooler1, which is a pneumatically driven Gifford — McMahon cryocooler and will be used for the conduction-cooled low temperature superconducting magnets, has been optimized by numerical and experimental study. After the optimization, the maximum cooling capacity of 36.5 W at 35 K on the first stage and 1.08 W at 4.2 K on the second stage with 6.7 kW input power has been obtained. This is the world’s first pneumatically driven G-M cryocooler which has over 1 W cooling capacity at 4.2 K. In this paper, experimental and numerical results of the influence of the valve opening timing and the displacer motion concerning the cooling capacity are described. The experimentally obtained optimum P-V diagram and valve timing are in good agreement with the numerical simulation results. And the reliability tests (over 100 times of cool-down and warm-up cycle, and over 3,000 hours continuous operation) were successfully conducted. It can be expected that this 4 K cryocooler has a high reliability equivalent to the commercial G-M cryocoolers which operate above 10 K on the 2nd stage temperature.


Cooling Capacity Stage Temperature Refrigeration Capacity Cryogenic Engineer Valve Open Timing 
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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • T. Kurihara
    • 1
  • M. Okamoto
    • 1
  • K. Sakitani
    • 1
  • H. Torii
    • 2
  • H. Morishita
    • 2
  1. 1.Mechanical Engineering LaboratoryDaikin Industries Ltd.Sakai, Osaka 591Japan
  2. 2.VC DivisionDaikin Industries Ltd.Sakai, Osaka 592Japan

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