Analysis of AC transport characteristic of high Tc multilayer cable.

Numerical studies on characteristics of electromagnetic behaviors of co-axial multi-layer superconducting cable conductors with superconducting magnetic shields were performed. The inter-layer current distribution and AC loss dependencies on the twist pitches and the diameter of the superconducting layers of the cables were investigated. The numerical results showed that the magnetic field produced by the shielding currents flowing in the superconducting magnetic shield strongly affected the current distribution and the AC losses of the cable. Based on the model, the optimized cable structures for uniform current distribution and to reduce the AC losses were studied. Examples of the optimized structures obtained by our model were presented and compared with those obtained by the conventional electrical circuit model. The differences between the results obtained by our model and those obtained by the circuit model were discussed. [ABSTRACT FROM AUTHOR]