A new symmetrical arrangement of tape-shaped multifilaments for Bi-2212/Aground-shaped wire

A new Bi-2212/Ag found-shaped wire with tape-shaped multifilaments has been successfully developed. The wire includes 126-960 tape-shaped Filaments wi th triple rotation symmetry, having a good crystal alignment in each filame nt. We refer the the new wire at ROSATwire, (ROtation-Symmetric Arranged Ta pe-in-tube wire). Since the ROSATwire structure yields complete symmetrical arrangement of the tape-shaped filaments. it is eliminates the need of a r olling machine, but allows us to use a drawing or extrusion machine. We fou nd that the present wire fabrication process markedly improves not only pro ductivity and lowers cost, but also enhances the transport J(c) of the Bi-2 1212/Ag wire. The I-c and J(c) reached >340A and 1000A/mm(2) at 28T and 4K.