Development of Bi-2223 multifilament tapes for transposed segment conductors

We developed Bi-2223 narrow tape for a transposed segment conductor. The tape was 0.23 mm thick and 1.90 mm wide, almost half the conventional tape width. It used a Ag-Mg-Sb alloy for the sheath material and consisted of Ag/ SC ratio of 2.2 and 37 filaments. We adjusted the Ag/SC ratio to improve the mechanical strength of the newly developed narrow tape and obtained a tensile strength of 108 MPa. The narrow tape kept the initial I-c value until a flat-wise bending strain was up to 0.6% or an edge-wise bending strain was up to 0.3%. Moreover, it was flexible enough to be machine-fabricated into a transposed segment conductor. (C) 2002 Elsevier Science B.V. All rights reserved.