Quantitative Evaluation of Perpendicular-field Losses in Stacked Oxide Superconducting Tape-shaped Wires

Abstract

We investigate the influences of stacks of Bi-2223 multifilamentary tape-shaped wires without twisting on AC losses observed in an external magnetic field perpendicular to the wide surface of them. The perpendicular-field losses decrease with increasing the number of stacks in the small range of field amplitude. In the larger amplitude, on the other hand, the AC losses have a good agreement with each other. This can be understood by the effects of magnetic interaction between wires. By taking into account the effective demagnetization factors on the basis of theoretical consideration, the perpendicular-field losses are plotted on a master curve for the maximum magnetic field applied to the wires. Furthermore, the perpendicular-field losses measured as a function of the field amplitude are well reproduced by the numerical evaluation of AC losses for a slab with infinitely wide faces.