학술논문
Performance of Polyvinyl Formal Insulated Cu–Nb/Nb3Sn Wires for React-and-Wind Process
Document Type
Periodical
Author
Source
IEEE Transactions on Applied Superconductivity IEEE Trans. Appl. Supercond. Applied Superconductivity, IEEE Transactions on. 29(5):1-5 Aug, 2019
Subject
Language
ISSN
1051-8223
1558-2515
2378-7074
1558-2515
2378-7074
Abstract
In this study, polyvinyl formal (PVF) insulated Cu-Nb/Nb 3 Sn wires were successfully developed for react-and-wind (R&W) process. The bronze-processed Nb 3 Sn wires, composed of the Nb-rod-method Cu–Nb reinforcing stabilizer around the Nb 3 Sn filament bundle, have superior mechanical strength against tensile and bending stress, not only at low temperature but also at room temperature. The Cu–Nb/Nb 3 Sn wires of 0.8- or 1.3-mm bare-diameter were heat-treated at 670 °C for 96 h on the stainless bobbins of predetermined diameter. Then, prebending strains were applied to the reacted wires under individual conditions. After that, the PVF insulation was applied with a thickness of 20 or 40 μm. Enhancement of the critical currents occurred by applying the appropriate prebending treatments and controlling the strain under PVF insulation processing to ±0.5% or less. This paper presents the performance of the PVF-insulated Cu–Nb/Nb 3 Sn wires applicable to R&W coils.