Influence of lateral critical current density distributions of AC transport losses for Ag-sheathed (Bi,Pb)-2223 multifilamentary tapes with different filament arrangements

摘要

The influence of lateral critical current density (J{sub}c) distributions on AC transport losses in self-fields at 77 K have been investigated on the Ag-sheathed (Bi,Pb)-2223 multifilamentary tapes with different filament arrangements. The trapped magnetic field distributions in a remanent state on the tape surface measured by a scanning Hall sensor depend on the filament arrangements and gradually deviate from the calculation results of magnetic profile without any J{sub}c variations in their cross sections. The transport loss values are strongly influenced from the filament arrangements in each tape, although the main contribution to the losses comes by the hysteresis loss in the superconductor. These results are explained by the calculation results of the shape of field-free core and flux-penetration-regions, varying with filament arrangements and local J{sub}c distributions along a width direction.