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Development of High-Current Vapor-Cooled Current Leads for Fusion Devices

  • E. Tada
  • Y. Takahashi
  • M. Yamaguchi
  • T. Hiyama
  • T. Kato
  • M. Oshikiri
  • K. Kawano
  • S. Shimamoto
  • A. Ishihara
  • N. Sakaki
  • T. Uede
  • K. Ogushi
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 31)

Abstract

Japan Atomic Energy Research Institute (JAERl) has been developing a high-current vapor-cooled current lead with a nominal current more than 30 kA for used with the superconducting coil of the Fusion Experimental Reactor. As a development step, we have fabricated a number of current leads with a cable-in-conduit geometry and have tested them up to 20 kA. The measured heat leak at 4 K is about 1.0 W with helium flow rate of 0.05 g/s-kA, which is exactly the same as for the ideal self-cooling condition. In addition, stable operation at the nominal current is possible for more than 10 min with no helium flow. The measured thermal performances are in sufficiently good agreement with those calculated that we concluded that the heat exchange coefficient in current leads is very close to the theoretical value. This paper describes the development status and the test results obtained at operating currents up to 20 kA together with the comparison between the measured and calculated characteristics.

Keywords

Void Fraction Thermal Performance Helium Flow Current Lead Nominal Condition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    E. Tada et al, Experiences on high current leads for superconducting Magnets; seven types from 1 kA to 30 kA, Cryogenics 24: 200 (1984)CrossRefGoogle Scholar
  2. 2.
    E. Tada et al,”Thermal Analysis Code of Current Lead,” J AERI-M 85–107, JAERI, Naka, Japan (1985)Google Scholar
  3. 3.
    “Convective Heat and Mass Transfer,” W. M. Kays, ed., McGraw-Hill, New York (1966)Google Scholar

Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • E. Tada
    • 1
  • Y. Takahashi
    • 1
  • M. Yamaguchi
    • 1
  • T. Hiyama
    • 1
  • T. Kato
    • 1
  • M. Oshikiri
    • 1
  • K. Kawano
    • 1
  • S. Shimamoto
    • 1
  • A. Ishihara
    • 2
  • N. Sakaki
    • 2
  • T. Uede
    • 2
  • K. Ogushi
    • 2
  1. 1.Division of Thermonuclear Fusion ResearchJapan Atomic Energy Research Institute NakaNaka, IbarakiJapan
  2. 2.Fuji Electric LtdKawasaki, KanagawaJapan

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