Speaker
Xinsheng Yang
(Southwest Jiaotong University)
Description
As the only high-temperature superconductors (HTS) that can be made into round wires without anisotropy, Bi-2212 has significant potential applications as CICC (cable in conduit conductor) for large-scaled superconducting magnets in fusion reactors. However, Bi-2212 is brittle and sensitive to strain which leads to a low mechanical performance. The effort on studying the impact of strain on the transport properties is mainly focus on the axial strain. During the CICC fabrication, the conductor will be inevitably subjected to twisting strain, while the twisting strain of Bi-2212 is rarely reported. The twisting strain has a large impact on CICC design and manufacturing.In this paper, twisting degradation at 77 K under background field for Bi-2212 tapes and round wires is investigated. The results show that the critical current of Bi-2212 tapes depends strongly on the magnetic field angle, while round wires have no anisotropy. The twisting strain has great impact on the critical current of Bi-2212 tapes, while less influence on the Bi-2212 tapes. Bi-2212 round wires exhibit strong advantages over tapes.
Co-author
Xinsheng Yang
(Southwest Jiaotong University, Chengdu, China)
