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Numerical simulation of inductive measurement of critical current density in HTS: high-performance method for solving shielding current equations

Published online by Cambridge University Press:  20 December 2006

A. KAMITANI ,
S. IKUNO  and
H. NAKAMURA
A. KAMITANI
Affiliation:
Department of Informatics, Yamagata University, Johnan 4-3-16, Yonezawa, Yamagata 992-8510, Japan
S. IKUNO
Affiliation:
School of Computer Science, Tokyo University of Technology, Katakura 1440-1, Hachioji, Tokyo 192-0982, Japan
H. NAKAMURA
Affiliation:
Theory and Computer Simulation Center, National Institute for Fusion Science, Oroshi-cho 322-6, Toki, Gifu 509-5292, Japan
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Abstract

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A numerical code has been developed for analyzing the time evolution of the shielding current density in the high-temperature superconductor (HTS) bulk. In the code, the shielding current equations are discretized by means of the element-free Galerkin method and the resulting nonlinear system is solved by use of the pseudo Newton method with a variable relaxation factor. By means of the code, the shielding current density is calculated in cases where the ac current flows in a coil placed just above the HTS. The voltage induced in the coil is evaluated as a function of time and its spectral analysis is performed. The results of computations show a qualitative agreement with Mawatari's experimental results.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 1061 - 1064
Copyright
2006 Cambridge University Press