Magnetization Loss of Stacked Bi-2223/Ag Tapes in External Magnetic Field

This paper investigates the magnetization loss of stacked Bi-2223/Ag tapes. A numerical code was developed to estimate the magnetization loss of stacked tapes in parallel and perpendicular external magnetic fields. To calculate magnetization loss and current distribution across the tapes, we used magnetic field dependent current-voltage characteristics of a tape. The numerically calculated result showed good agreement with the measured magnetization loss in a tape. In a perpendicular field, it was observed that the loss per unit volume decreased as the stacking number increased because of the screening current across the tapes. In a parallel field, the loss per unit volume remained virtually unchanged as the stacking number increased. The influence of stacking effect on magnetization loss is addressed with the induced current distribution obtained from numerical calculation.