Plasma and Fusion Research

Volume 18, 2405063 (2023)

Regular Articles

Change in Critical Surface of Nb3Sn Wire by Neutron Irradiation
Arata NISHIMURA, Yoshimitsu HISHINUMA, Hidetoshi OGURO1) and Satoshi AWAJI2)
National Institute for Fusion Science, Toki 509-5292, Japan
1)
Tokai University, Hiratsuka 259-1292, Japan
2)
Tohoku University, Sendai 980-8577, Japan
(Received 9 January 2023 / Accepted 12 June 2023 / Published 2 August 2023)

Abstract

Neutron irradiation on Nb3Sn wire changes its superconducting properties. It is well known that the critical current increases by the irradiation once and then decreases by further irradiation. In this paper, the effective upper critical magnetic field and the critical temperature of the irradiated Nb3Sn wire were investigated, and the mechanism that causes such changes were discussed qualitatively by focusing on the role of the irradiation defects together with the normal metallurgical flaws. In addition, a critical surface was taken up and the general tendency of the change in the surface was discussed.

Keywords

critical surface, Nb3Sn, neutron irradiation, irradiation defects, pinning site

DOI: 10.1585/pfr.18.2405063

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