[Table of Contents]

Plasma and Fusion Research

Volume 9, 3401129 (2014)

Regular Articles

Numerical Simulation of Contactless Methods for Measuring jC in High-Temperature Superconducting Film: Influence of Defect on Resolution and Accuracy
Teruou TAKAYAMA, Atsushi KAMITANI, Soichiro IKUNO1) and Hiroaki NAKAMURA2)
Yamagata University, 4-3-16 Johnan, Yonezawa, Yamagata 992-8510, Japan
1)
Tokyo University of Technology, 1404-1 Katakura, Hachioji, Tokyo 192-0982, Japan
2)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 18 November 2013 / Accepted 13 March 2014 / Published 29 July 2014)

Abstract

The inductive method for measuring the critical current density in a high-temperature superconducting (HTS) film has been reproduced numerically. To this end, a numerical code has been developed for analyzing the time evolution of a shielding current density in an HTS film containing a crack. The of computational results show that the accuracy of the inductive method monotonously increases with the height of the coil. In addition, the accuracy is slightly improved by changing the inner radius of the coil, and there exists the optimum inner radius. Although the accuracy is degraded due to the crack, this result means that the inductive method can be applied to the crack detection. Consequently, the crack located near the film edge cannot be detected with high accuracy because the crack is treated the same as the film edge.

Keywords

critical current density, crack detection, high-temperature superconductor, inductive method, numerical simulation

DOI: 10.1585/pfr.9.3401129

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References

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This paper may be cited as follows:

Teruou TAKAYAMA, Atsushi KAMITANI, Soichiro IKUNO and Hiroaki NAKAMURA, Plasma Fusion Res. 9, 3401129 (2014).