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Cryogenic load calculation of high-critical temperature current lead.

Author(s) : HERRMANN P. F., COTTEVIEILLE C., DUPERRAY G., LERICHE A., VERHAEGE T., ALBRECHT C., BOCK J.

Type of article: Article

Summary

High-temperature superconducting current leads are composed of a normal metal part, a high-critical temperature part, conducting the current from an intermediate temperature (often 77 K) down to liquid helium temperature. The cryogenic load and the corresponding power consumption of both parts are compared to the electrical power consumption of an equivalent all metal current lead. The calculation uses material parameters from sintered yttrium-123 and melt-cast processed bismuth-2212 tubes. The use of very short high-critical temperature conductor parts (50 mm) and the possibility of fabricating a short metallic lead for 77 K operation allows to design very short (lower than 0.3 m) and high performance current leads for 4.2 K applications. This current lead can be designed to pass right through the insulating vacuum of a cryostat, presenting new opportunities for a more compact cryostat system. Stability considerations indicate that the current lead is not sensitive to flux jumps. A safety margin must be considered in the design of the current lead.

Details

  • Original title: Cryogenic load calculation of high-critical temperature current lead.
  • Record ID : 1994-0031
  • Languages: English
  • Source: Cryogenics - vol. 33 - n. 5
  • Publication date: 1993/05

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