AC LOSSES IN MULTIFILAMENTARY SUPERCONDUCTORS CARRYING TRANSPORT CURRENT AND EXPOSED TO EXTERNAL MAGNETIC-FIELD - ANALYSIS OF TEMPORAL EVOLUTION OF CURRENT DISTRIBUTION

The temporal evolutions of current distribution in multifilamentary superconductors were calculated numerically, while they were carrying the transport current and exposed to the spatially-distributed external magnetic field. Multifilamentary superconductors were represented with a electrical circuit model assuming the axisymmetric current distribution. The current distribution is substantially influenced by the axial distribution of the longitudinal magnetic field. AC losses were calculated from the temporal evolutions of the current distribution. Influence of the transport current and the longitudinal component of the external magnetic field distributed spatially on the losses were studied. The additional losses due to the transport current and the longitudinal magnetic field are not negligible as compared to the losses due to the transverse magnetic field.