Construction and Commissioning Tests of a 10 kW Class Helium Refrigerator for the Large Helical Device

  • S. Satoh
  • T. Mito
  • S. Yamada
  • J. Yamamoto
  • O. Motojima
  • S. Moriuchi
  • I. Ohtake
  • M. Katada
  • T. Fukano
Part of the A Cryogenic Engineering Conference Publication book series (ACRE, volume 41)

Abstract

The Large Helical Device is a heliotron fusion experimental device in which magnetic fields are controlled exclusively by superconducting coils: a pair of helical coils and three pairs of poloidal coils1. The helium refrigerator in the LHD cryogenic system has a design capacity of 5700 W refrigeration at 4.4 K, plus 650 L/h liquefaction and 20600 W refrigeration between 40 and 80 K. The contract was signed in July 1992 and the construction at the site (Toki-city, Japan.) was completed at the end of 1994. Subsequently, a series of commissioning runs were made and various design performances are being confirmed. These include the independent and combined runs of 8 compressors at full power under the helium operating conditions, a demonstration of the helium purifier, and the manual or automatic liquefaction operations that use VME controllers with a newly developed distributed control system software. These results demonstrate that the refrigerator has a satisfactory thermodynamic performance in general.

Keywords

Entropy Enthalpy Transportation Helium Assure 

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References

  1. 1.
    Motojima, O. et al., Physics and engineering design studies on LHD, Fusion Engineering and Design, 20, 3–14 (1993).CrossRefGoogle Scholar
  2. 2.
    Satoh, S. et al., Construction of a 10-kW-class helium cryogenic system for the Large Helical Device, Cryogenics, 1994, vol. 34, ICEC supplement 95–98, (1994).Google Scholar

Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • S. Satoh
    • 1
  • T. Mito
    • 1
  • S. Yamada
    • 1
  • J. Yamamoto
    • 1
  • O. Motojima
    • 1
  • S. Moriuchi
    • 1
  • I. Ohtake
    • 1
  • M. Katada
    • 2
  • T. Fukano
    • 2
  1. 1.National Institute for Fusion ScienceFuro-cho, Tikusa-ku, Nagoya, AichiJapan
  2. 2.Nippon Sanso CorporationKawasaki-ku, Kawasaki, Kanagawa, 210Japan

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