Thermal Conductivity and Dilatation of Bi-2223/Ag (DI-BSCCO) Superconducting Wire Laminated With Various Thin Alloy Tapes

A Bi-2223/Ag wire laminated with Ni-alloy tapes offered the high critical tensile strength over 400 MPa with a high critical current of about 200 A, which has just started to be equipped in high-field facilities. To design such a practical superconducting apparatus, we must know the heat leakage through the wires and the elasticity among the constitutional materials. In this paper, we report on the thermal conductivity and dilatation of this new Bi-2223/Ag/Ni-alloy tape, compared to those of other Bi-2223/Ag tapes, and discuss the contribution of the lamination alloy to the thermal properties.