Design Chart of Optimum Current Leads

  • K. Ishibashi
  • K. Maehata
  • A. Katase
  • M. Wake
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 31)


The heat flow through current leads is one of major heat losses in a superconducting magnet system. To reduce the heat flow, current leads have been optimized in a complex way by varying such quantities as conductor length, cross-sectional area, heat transfer coefficient and cooling perimeter. Therefore, this study is made to simplify the design procedure, and to explain the general characteristics of the current leads. A new combined parameter which takes turbulent flow into account is introduced in the present work to enable us to draw a useful design chart. This chart gives, to a wide variety of current leads, detailed information about the optimum design-viz. geometric dimensions, heat flow into liquid helium, and pressure drop of the cooling gas. Change of the cross-sectional area along the conductor may improve the current lead performance. The effects of this area change are examined in detail.


Pressure Drop Heat Transfer Coefficient Heat Flow Nusselt Number Current Lead 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. M. Lock, Optimization of current leads into cryostat, Cryogenics 9: 438 (1969).Google Scholar
  2. 2.
    R. Agsten, Thermodynamic optimization of current leads into low temperature regions, Cryogenics 19: 141 (1973).CrossRefGoogle Scholar
  3. 3.
    J. W. L. Kohler, G. Prast and A. K. De Jonge, Calculation of losses induced by current-carrying leads in cryogenic installations, in: “Proc. Third Intl. Cryo. Engr. Conf.,” Butterworth, Guildford, UK (1970), p. 192.Google Scholar
  4. 4.
    A. Bejan and E. M. Cluss, Jr, Criterion for burn-up conditions in gas-cooled cryogenic current leads, Cryogenics 16:515 (1976).CrossRefGoogle Scholar
  5. 5.
    G. Aharonian, L. G. Hyman and L. Roberts, Behaviour of power leads for superconducting magnets, Cryogenics 21: 145 (1981).CrossRefGoogle Scholar
  6. 6.
    C. O. Bennet and J. E. Mayers, “Momentum, Heat, and Mass Transfer”, McGraw-Hill, New York (1962).Google Scholar
  7. 7.
    G. D. Nigohhossian, Optimization of current leads for cryogenic engineering, CEA-R 3167, CEN/Saclay, GIF-sur-YVETTE, France (1967).Google Scholar
  8. 8.
    K. Ishibashi et al., Development of disk-fin type compact current leads (in Japanese), Cryogenic Engnineering 20: 159 (1985)Google Scholar
  9. 9.
    M. Wake et al., A Large Superconducting Thin Solenoid Magnet for Tristan Experiment (VENUS) at KEK, IEEE Trans. Magn. MAG-21:494(1985)CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • K. Ishibashi
    • 1
  • K. Maehata
    • 1
  • A. Katase
    • 1
  • M. Wake
    • 2
  1. 1.Department of Nuclear EngineeringKyushu UniversityHakozaki, FukuokaJapan
  2. 2.National Laboratory for High Energy Physics (KEK)Oho-machi, IbarakiJapan

Personalised recommendations