Optimization Of High-Temperature Superconductor Current Leads

S. Y. Seol; J. R. Hull; M. C. Chyu

doi:10.1109/77.402665

Optimization Of High-Temperature Superconductor Current Leads

S. Y. Seol, J. R. Hull, M. C. Chyu

Mechanical Engineering

Research output: Contribution to journal › Article

3 Scopus citations

Abstract

Methods to improve the performance of high-temperature superconducting current leads are analyzed. Designs are considered that are inherently safe from burnup, even if the lead enters the normal state. The effect of a tapered lead that takes advantage of the increase in critical current density with decreasing temperature will decrease helium boiloff by about a factor of two for an area ratio of four. A new concept, in which Ag powder is distributed in increasing concentration from the cold end to the hot end of a sintered YBCO lead, is shown to have comparable performance to that of leads made with Ag-alloy sheaths. Performance of the best inherently safe designs is about one order of magnitude better than that of optimized nonsuperconducting leads. BSCCO leads with Ag-alloy sheaths show improved performance for Au fractions up to ≈ 3%, after which increases in Au fraction yield negligible improvement in performance.

Original language	English
Pages (from-to)	785-788
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	5
Issue number	2
DOIs	https://doi.org/10.1109/77.402665
State	Published - Jun 1995

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abstract = "Methods to improve the performance of high-temperature superconducting current leads are analyzed. Designs are considered that are inherently safe from burnup, even if the lead enters the normal state. The effect of a tapered lead that takes advantage of the increase in critical current density with decreasing temperature will decrease helium boiloff by about a factor of two for an area ratio of four. A new concept, in which Ag powder is distributed in increasing concentration from the cold end to the hot end of a sintered YBCO lead, is shown to have comparable performance to that of leads made with Ag-alloy sheaths. Performance of the best inherently safe designs is about one order of magnitude better than that of optimized nonsuperconducting leads. BSCCO leads with Ag-alloy sheaths show improved performance for Au fractions up to ≈ 3%, after which increases in Au fraction yield negligible improvement in performance.",

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