Heat treatment effect on the strain dependence of the critical current for an internal-tin processed Nb3Sn strand
✍ Scribed by Sangjun Oh; Soo-Hyeon Park; Chulhee Lee; Heekyung Choi; Keeman Kim
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 563 KB
- Volume
- 470
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
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 3 Sn 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.