EFFECT OF REVERSIBLE FLUXOID MOTION IN SUPERCONDUCTING BI-2223 MULTIFILAMENTARY WIRE

The AC penetration depth, lambda(0)', in a Bi-2223 multifilamentary ta pe wire was estimated from the slope of minor magnetization curve. It is found that lambda(0)' is comparable to the thickness of the filamen t and the hysteresis loss is reduced from the prediction of Kim model due to the effect of the reversible fluxoid motion at high temperature s. It is recommended to reduce the thickness of the filament below 2 m u m for the reduction of hysteresis loss at 77 K.