COMPARISON OF MAGNETICALLY INDUCED AND TRANSPORT CURRENT AC LOSSES INSILVER-SHEATHED (BI,PB)(2)SR2CA2CU3O10 TAPES

A quantitative comparison has been made for ac losses at power frequen cies, which were determined by a magnetically induced technique and a transport current technique, for silver-sheathed (BiSb)(2)Sr2Ca2Cu3O10 tapes. A meaningful comparison of these losses can be made based on t he normalized currents (with respect to the respective deduced critica l current) rather than the amplitudes of surface magnetic fields. Then , the intrinsic difference in the losses is shown to originate from a geometrical factor and a difference in the deduced critical currents. The discrepancy in the critical currents arises from the facts that th e directions of penetrating magnetic field to the tape face are differ ent in these cases and the critical currents are highly dependent on t he field direction.