Current distributions and AC losses in self-fields for superconductor tapes and cables

The alternating current losses in self-fields for superconductor tapes and cables are investigated using numerical calculations. In the calculation, t he current distributions and self-field losses for straight superconductors with the arbitrary sectional geometry are calculated as a parameter of cur rent amplitude. For the 7-filamentary tapes, the losses are depending on th e filament configurations, which is also observed experimentally in the 7-f ilaments samples. In case of cables, the values of the losses are strongly influenced by the tape arrangements. The losses for altered cables, which a re composed of a number of same tapes, are different from each other. These results suggest that the optimization of tape and cable structure, i.e. th e arrangement of the superconductor cores in the cables, is useful to reduc e the loss generations in the cables.