Recent development of Bi(2223)/AG tapes for practical applications

In this paper we report about some of the major developments of Ag sheathed Bi(2223) tapes that are actually under study in view of a possible practic al application of these conductors. Efforts on improving the tape behavior in presence of alternating currents and high magnetic fields have to be don e together with a severe optimization of the Powder-In-Tube method. A clear reduction of the magnetic AC losses is observed by AC susceptibility measu rements performed on twisted Bi(2223) tapes prepared at the University of G eneva, with a resistive barrier capable of reducing the coupling losses bet ween filaments. Finally, we report on multifilamentary tapes developed with a special configuration that can be of great interest when a magnetic fiel d is applied to the tape at a significant angle with respect to the a-b pla nes of the superconductor.