INFLUENCE OF EXTERNAL MAGNETIC-FIELD AND ITS ORIENTATION ON TRANSPORTAC LOSSES IN BI-2223 AND TL-1223 SILVER-SHEATHED TAPES

In the paper we report measurements of energy losses caused by an AC t ransport current in silver sheathed multifilamentary Bi-2223 and mono core Tl-1223 tapes, as a function of the magnitude and orientation of the applied external magnetic field. The external magnetic field was r otated in the range of 0 to +/-90 degrees with respect to the plane of the tapes, and was in all cases perpendicular to the transport curren t flow. The transport current losses in a range of DC applied fields a re consistent with the Norris equation provided the DC critical curren t at the same applied field is used in his expression for the loss.