Toward a standard for critical current versus axial strain measurements of Nb 3Sn

B. Seeber, G. Mondonico, C. Senatore

Research output: Contribution to journalArticlepeer-review

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Abstract

Knowledge of the critical current of Nb 3Sn wires under mechanical loads is increasingly important. In this work, based on an investigation of the bronze Nb 3Sn reference wire for the international ITER benchmarking, practical aspects of an I c(ε, B) measurement are discussed and commented on. The use of a helical spring according to Walters et al (1986 Cryogenics 26 406) is favored. It is shown that I c at zero applied strain can be measured precisely, thus contributing to an improvement in the determination of εm, the strain for the maximum of I c. Further, a new approach for the evaluation of the irreversibility limit, εirr, is proposed by a detailed analysis of log V versus log I characteristics. Finally some recommendations for an eventual future standard are made.

Original languageEnglish
Article number054002
JournalSuperconductor Science and Technology
Volume25
Issue number5
DOIs
StatePublished - May 2012
Externally publishedYes

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