Effect of Axial Strain for Newly Designed High Current Density Nb3Sn Wires With Distributed Barrier Strands (DBS)

Abstract

Superconducting wires are essential materials for the future energy industries and fundamental scientific researches. As the demand for high energy productions and advanced researches continues to grow, the required superconducting wires need to have a higher performance. Kiswire Advanced Technology Co., Ltd. developed a Distributed Barrier Strands (DBS) Nb₃Sn wire with high critical current density (Jc) and the wire is under mass production for the manufacturing of the superconducting magnets in Superconducting Conductor Experiment (SUCCEX) facility, a 16 Tesla superconducting conductor test facility, which is being developed by the Korea Institute of Energy Technology (KENTECH) Kim et al. 2025. The DBS wire is designed to facilitate the efficient diffusion of Ti content by incorporating a distributed diffusion barrier and placing Sn content within the sub-elements in a manner similar to the Distributed Tin (DT) structure. This design effectively reduces the bridging between Nb filaments and unreacted Nb, leading to significant improvements in electrical performance and measurement stability compared to the DT design. In this study, we focused on evaluating the strain effect on the wire to examine how the wire design influences the degradation of electrical properties and to analyze the scaling coefficient.