AC loss analysis on high-temperature superconductors with finite thickness and arbitrary magnetic field dependent voltage–current relation

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  • T. Yazawa
    Low Temperature Division, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
  • J. J. Rabbers
    Low Temperature Division, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
  • B. ten Haken
    Low Temperature Division, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
  • H. H. J. ten Kate
    Low Temperature Division, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
  • H. Maeda
    Power and Industry Systems Research and Development Center, Toshiba Co., 2-4 Suehiro, Tsurumi, Yokohama, 230, Japan

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<jats:p>A numerical model is developed for the current distribution in high-temperature superconductors (HTS conductors) subjected to self and applied field. This analysis is based on the two-dimensional Poisson equation for the vector potential. The vector potential is rewritten into an equation of motion for the current density J. The finite thickness of the conductor and the n-power law electric field-current density relations (E-J relations) of the conductor are included in the model. The magnetic field dependence of critical current density Jc is also included in this E-J relation. The self-field loss obtained with this analysis has good agreement with experimental data. Also the effects of aspect ratio and n value on ac loss are pointed out to be important on the ac loss.</jats:p>

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