Diffusion model for the computation of current density distributions in composite superconductors

M. Lahtinen, J. Paasi, L. Kettunen

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

We propose a magnetic diffusion model for the computation of current density distributions in composite superconductors. The two-dimensional model is based on Maxwell's equations and a non-linear constitutive relation between the current density and the electric field. The resulting diffusion equation is solved using the finite element method. We present numerical results on the time evolution of the current density distribution and the surface electric field in monofilamentary superconducting tapes excited by slow current ramps. The results demonstrate that the diffusion model appropriately describes the critical state, the electric field due to the self-field effect, and current sharing in composite superconductors.

Original languageEnglish
Pages (from-to)951-956
Number of pages6
JournalCryogenics
Volume36
Issue number11
DOIs
Publication statusPublished - 1 Dec 1996
MoE publication typeA1 Journal article-refereed

Keywords

  • Composite superconductor
  • Computational electromagnetics
  • Current density distribution

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