Improvement in Characteristics of Bronze-processed Nb3Sn Superconducting Wires

Characteristics such as the critical current density (Jc) and mechanical property of bronze-processed Nb 3 Sn superconducting wires have improved with the progress on high-field superconducting magnets such as nuclear magnetic resonance (NMR) magnets. On the other hand, for Nb 3 Sn wiresused in intermediate magnetic-field applications such as fusion and particle accelerator magnets, the wire parameters have been optimized to realize high Jc around 12 T. In this article, improvements in the Jc and mechanical property of bronze-processed Nb 3Sn wires based on the activities of Japan Superconductor Technology, Inc. (JASTEC) and Kobe Steel, Ltd. are described.