Abstract

Influences of flux flow, flux creep, and temperature non-uniform distribution on ac loss in high temperature superconductors (HTS) are investigated. An asymptotic solutions of ac loss and temperature distribution are obtained in a form of power series of λ h, λ m, which are frequencies of the external ac magnetic field normalized to relaxation rates of thermal and magnetic field diffusions, respectively. Our results show that flux flow, flux creep, and thermal diffusion all contribute significantly to the frequency dependence of ac loss per cycle, although each of them affects the ac loss in a different way. Our calculation can well explain the frequency-dependent phenomena observed in HTS.

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