The superconducting wire with approximately 10 (im diameter filaments of Nb-41wt%Ti28wt%Ta alloy was fabricated from our standard production billet. Critical current densities and upper critical fields after various heat treatments were measured in the temperature range of 4.2 K to 1.6 K. Thermo-mechanical treatments for a-Ti precipitates were optimized to improve critical current densities. A 27strand Rutherford type cable having a large keystone angle was trial-fabricated using the optimized-processed wires. The achieved J/s were 1383 A/mm2 (10 T and 1.9 K) and 602 A /mm2 (12 T and 1.9 K). The fabricated wire was proved to have high homogeneity and good workability.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering