Fabrication and Characteristics of Tl-Series Oxide Superconducting Multi-Layered Pancake Coil

Abstract

The authors have been studying the fabrication conditions of long silver-sheathed Tl-series oxide superconducting wires. A multi-layered pancake coil was fabricated by piling 12 single pancake coils wound with the 17.5m long tape shaped wires. It was confirmed by the criterion of 10^-13Ωm that the multi-layered pancake coil was superconducting on the whole length. This multi-layered coil generated a maximum magnetic field of 510G at 77K and 1, 410G at 4.2K, respectively. The J_c of this coil was restricted by the local J_c properties of the tape where the maximum self-magnetic field of the coil was induced.