Abstract
Magnetic field and AC losses are investigated on multi-layer superconductor cables through numerical calculations. The inter-layer magnetic fluxes for two layer cables under critical current transmission are calculated as a function of spiral length. The value of the flux varies with varying spiral length and agrees with the theoretical ones. Although the value of inter-layer flux becomes zero in an adjusted spiral length, the flux between tape center and edges shows non-zero values. This means that the AC losses for the cables with adjusted spiral length are mainly generated from tape edges. Therefore, it is suggested that there is much room for further improvement in actual magnetic field structure to reduce the AC losses for cables with balanced current by adjusting the spiral lengths.
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