Abstract
The frequency-dependent critical current of a superconductor strip and Roebelcable has been studied using a 2D finite element simulation. It is shownthat the critical current of the superconductor increases with frequency asf1/n, wheren is the exponent of the power law flux creep model. Transportac loss in a superconductor strip decreases with frequency asf − 2/n when the amplitude of the applied ac current is far less than its criticalcurrent. However, when the applied current is large and becomes comparableto the critical current, the transport ac loss decreases with frequency as1/f. The analytical results are substantiated with available experimental data and the resultsof a 2D finite element simulation.
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