Experimental and numerical study of a YBCO pancake coil with a magnetic substrate

Min Zhang, J. Kvitkovic, S. V. Pamidi, T. A. Coombs

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43 Citations (Scopus)

Abstract

A finite element model for a YBCO pancake coil with a magnetic substrate is developed in this paper. An axial symmetrical H formulation and the E-J power law are used to construct the model, with the magnetic substrate considered by introducing an extra time-dependent term in the formula. A pancake coil is made and tested. The measurement of critical current and transport loss is compared to the model result, showing good consistency. The influence of magnetic substrate in the condition of AC and DC current is studied. The AC loss decreases without a magnetic substrate. It is observed that when the applied DC current approaches the critical current the coil turn loss profile changes completely in the presence of magnetic substrate due to the change of magnetic field distribution.

Original languageEnglish
Article number125020
Number of pages6
JournalSuperconductor Science and Technology
Volume25
Issue number12
DOIs
Publication statusPublished - 1 Dec 2012

Keywords

  • finite element model
  • YBCO pancake coil
  • E–J power law
  • magnetic substrate
  • magnetic field distribution

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