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Heat treatment effect on the strain dependence of the critical current for an internal-tin processed Nb3Sn strand

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
470
Issue
2
Identifiers
DOI: 10.1016/j.physc.2009.11.062
Keywords
  • Heat Treatment
  • Internal-Tin Nb3Sn
  • Scaling Law For Flux Pinning
  • Strain Dependence Of The Critical Current

Abstract

Abstract A comparative study on the effects of heat treatment, especially, the duration of the A15 reaction temperature plateau on the strain dependence of the critical current for an internal-tin processed Nb 3Sn strand has been carried out. The strain dependence of the critical current is measured by a variable temperature Walter spiral probe that we have developed. It was shown that prolonged heat treatment can be a very effective way to improve the strain dependency. For a quantitative analysis, the measured data were analyzed with various proposed scaling laws: the scaling law based on strong-coupling theory, the modified deviatoric strain scaling law, and the interpolative scaling law. We found that there is a slight increase in the critical temperature and a substantial improvement in the maximum pinning force. The origin of improved strain dependency is further discussed.

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