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He II heat transfer through superconducting cables electrical insulation.

Author(s) : BAUDOUY B., FRANCOIS M. X., JUSTER F. P., et al.

Type of article: Article

Summary

For NbTi magnets cooled by superfluid helium (HeII), the most severe heat barrier comes the electrical insulation of the cables. Tests on electrical multi-layer insulations, made of Kapton, dry fiber and epoxy resin impregnated fiberglass tapes, indicate that heat transfer is influenced by He II contained in the insulation. Electrical insulation can be considered as a composite material made of a solid matrix with a complicated helium channels network. For several insulations, this network is characterized by steady-state heat transfer experiment through an elementary insulation pattern. Measurements in Landau regime for low temperature difference and in Gorter-Mellink regime for higher temperature differences permit to determine an equivalent He II channel cross-section with an equivalent channel thickness.

Details

  • Original title: He II heat transfer through superconducting cables electrical insulation.
  • Record ID : 2001-2623
  • Languages: English
  • Source: Cryogenics - vol. 40 - n. 2
  • Publication date: 2000

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