期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 470, 期 2, 页码 129-133出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2009.11.062
关键词
Heat treatment; Internal-tin Nb3Sn; Scaling law for flux pinning; Strain dependence of the critical current
资金
- Korea Ministry of Science and Technology of Republic of Korea
- Korean Government (MEST) [R01-2007-000-20462-0]
- National Research Foundation of Korea [R01-2007-000-20462-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 Nb3Sn 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. (C) 2009 Elsevier B.V. All rights reserved.
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