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An Investigation of Cooldown Strain in Potted Superconductive Magnets

  • E. C. Cannon
  • M. J. Superczynski

Abstract

The David Taylor Naval Ship Research and Development Center is currently developing superconducting electrical machinery for ship propulsion. These machines employ superconducting magnets as field windings that require cooldown to 4.2 K before operation. The magnets are dry wound using superconducting wire with fiberglass cloth between each layer. An “overwrap” of fiberglass cloth is placed over the last layer of wire to provide additional mechanical support and a means to interface the coil with its support system. The coil assembly is then evacuated in a potting chamber and filled with epoxy resin. The anisotropic continuum that this construction yields presents a rather complex heat transfer problem. The wire is a good thermal conductor that exhibits low temperature gradients during cooling; on the other hand, epoxy and fiberglass are insulators that tend to exhibit high temperature gradients when cooled.

Keywords

Thermal Contraction Magnet Composite Cooling Scheme Radial Temperature Gradient Test Magnet 
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.
    C. W. Fowlkes, A. F. Clark, P. E. Angerhofer, and R. N. Newton, “Characterization of a Superconducting Coil Composite,” NBSIR 73-349, National Bureau of Standards, Boulder, Colorado (1973).Google Scholar
  2. 2.
    A. F. Clark, W. F. Weston, V. D. Arp, J. G. Hust, and R. J. Trapani, “Characterization of a Superconducting Coil Composite and Its Components,” NBSIR 76-837, National Bureau of Standards, Boulder, Colorado (1976).Google Scholar
  3. 3.
    H. Messinger, and G. G. Green, Calculations and analyses performed on liquid helium refrigeration systems at David Taylor Naval Ship Research and Development Center; discussion with authors concerning same.Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • E. C. Cannon
    • 1
  • M. J. Superczynski
    • 1
  1. 1.Annapolis LaboratoryDavid W. Taylor Naval Ship Research and Development CenterAnnapolisUSA

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