Development of Ag-sheathed Bi2223 superconducting wires and their applications

Silver-sheathed multi filamentary BiPbSrCaCuO 2223 superconducting wires wi th long length and high Jc of over 3x10(4)A/cm(2) (77.3K, 0T) were develope d by using the powder-in-tube method. For future industrial applications, h igh de with high Ic wires, high strength wires and low AC loss wires were a lso developed for large scale magnet applications and electric apparatus fo r AC use. In the case of AC conductor, twist effect was investigated in ord er to reduce the wire AC loss. PVF coating technology was applied to high s trength wire. PVF coating technology made it possible to obtain high ampera ge parallel conductor with low AC loss, because each strand is electrically insulated. As a progress of wire technology, we could fabricate many appli cation prototypes. In the high amperage conductor application, current lead s and cable conductors were developed. In the magnet application, pancake m agnets cooled by GM refrigerator and operated at around 20K were developed. We have also developed the transformer as an AC application operated in th e liquid nitrogen.