The magnetic field, temperature, strain and angular dependence of the critical current density for Nb-Ti

Chislett-Mcdonald, SBL; Tsui, Y; Surrey, E; Kovari, M; Hampshire, DP

doi:10.1088/1742-6596/1559/1/012063

The magnetic field, temperature, strain and angular dependence of the critical current density for Nb-Ti

Chislett-Mcdonald, SBL; Tsui, Y; Surrey, E; Kovari, M; Hampshire, DP

Authors

SBL Chislett-Mcdonald

Y Tsui

E Surrey

M Kovari

Professor Damian Hampshire d.p.hampshire@durham.ac.uk
Professor

Abstract

A scaling law for Jc in commercial Nb-Ti wire is proposed that describes its magnetic field, temperature and strain dependence. The scaling law is used to fit extensive measurements of the total strand critical current density, Jc,TS(B, T, ε), with the applied field orthogonal to the axis of the wire. We present critical current density, heat capacity and resistivity measurements to obtain B ∗ c2(θ), which shows clear angular anisotropy. At 4.2 K, the resistivity data show B ∗ c2(B k J) − B ∗ c2(B ⊥ J) ≈ 1 T. We also discuss whether the fusion community should consider re-optimising standard commercial Nb-Ti wires that were developed for MRI applications at ∼ 5 T, to produce higher Jc at say 10 T, and higher upper critical fields, perhaps using quaternary Nb-Ti alloys with artificial pinning centres.

Citation

Chislett-Mcdonald, S., Tsui, Y., Surrey, E., Kovari, M., & Hampshire, D. (2020). The magnetic field, temperature, strain and angular dependence of the critical current density for Nb-Ti. Journal of Physics: Conference Series, 1559, Article 012063. https://doi.org/10.1088/1742-6596/1559/1/012063

Journal Article Type	Article
Online Publication Date	Jun 1, 2020
Publication Date	Jun 1, 2020
Deposit Date	Jun 22, 2020
Publicly Available Date	Jun 23, 2020
Journal	Journal of Physics: Conference Series
Print ISSN	1742-6588
Electronic ISSN	1742-6596
Publisher	IOP Publishing
Peer Reviewed	Peer Reviewed
Volume	1559
Article Number	012063
DOI	https://doi.org/10.1088/1742-6596/1559/1/012063

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