Study of HTS bulk current lead with metal alloy impregnation under vacuum

K. Tsuzuki, D. Sugyo, Y. Kimura, M. Izumi, Naomichi Sakai, M. Miki, H. Hayakawa

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The high-temperature superconductor (HTS) bulk current lead (BCL) is a crucial device for a large number of currert applications such as the propulsion motor with HTS winding. The coexistence of low thermal conductivity and superconductivity enables us to shrink the dimension of the power system. To use the BCL effectively, we have to optimize the temperature gradient across the BCL along its length. For this purpose, it is essential to obtain a better physical contact between the bulk HTS surface and Cu terminal leads. There are, however, many pores at the surface of the bulk which cause difficulties for joining. In order to solve this problem, we focused on an impregnation technique which has been known to improve strength and thermal characteristics of the bulk HTS itself by using epoxy. We succeeded to fill in the pores of the bulk HTS surface with a metal alloy impregnation Following this method, we made the BCL of Gd-Ba-Cu-O by ourselves. By adopting a suitable cooling with a GM cryocooler the resistance of the BCL was 0.8 across the BCL under a current flow of 300 A, considering one end was at 40 K and the other one was at 70 K. The properties of the present BCL are satisfactory for connecting a coil in large current power systems such as superconducting motors.

Original languageEnglish
Article number5109557
Pages (from-to)2214-2217
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume19
Issue number3
DOIs
Publication statusPublished - 2009 Jun 1
Externally publishedYes

Fingerprint

High temperature superconductors
Impregnation
high temperature superconductors
Lead
Metals
Vacuum
vacuum
metals
porosity
Superconductivity
Joining
Thermal gradients
Propulsion
Thermal conductivity
propulsion
Cooling
temperature gradients
coils
thermal conductivity
superconductivity

Keywords

  • Gd-Ba-Cu-O
  • High-T superconductor
  • Melt-growth bulk crystal
  • Superconducting coils
  • Superconducting current leads

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Study of HTS bulk current lead with metal alloy impregnation under vacuum. / Tsuzuki, K.; Sugyo, D.; Kimura, Y.; Izumi, M.; Sakai, Naomichi; Miki, M.; Hayakawa, H.

In: IEEE Transactions on Applied Superconductivity, Vol. 19, No. 3, 5109557, 01.06.2009, p. 2214-2217.

Research output: Contribution to journalArticle

Tsuzuki, K, Sugyo, D, Kimura, Y, Izumi, M, Sakai, N, Miki, M & Hayakawa, H 2009, 'Study of HTS bulk current lead with metal alloy impregnation under vacuum', IEEE Transactions on Applied Superconductivity, vol. 19, no. 3, 5109557, pp. 2214-2217. https://doi.org/10.1109/TASC.2009.2018449
Tsuzuki, K. ; Sugyo, D. ; Kimura, Y. ; Izumi, M. ; Sakai, Naomichi ; Miki, M. ; Hayakawa, H. / Study of HTS bulk current lead with metal alloy impregnation under vacuum. In: IEEE Transactions on Applied Superconductivity. 2009 ; Vol. 19, No. 3. pp. 2214-2217.
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