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Self-field effects on JC(B,T) measurements of Nb-Ti strands in high magnetic fields.

Ridgeon, F.J. and Raine, M.J. and Lakrimi, M. and Thomas, A. and Boutboul, T. and Hampshire, D.P. (2018) 'Self-field effects on JC(B,T) measurements of Nb-Ti strands in high magnetic fields.', IEEE transactions on applied superconductivity., 28 (4). p. 9001805.


We have investigated the applied magnetic field, temperature, and self-field dependence of the critical current density of a Nb-Ti strand produced for the ITER Poloidal Field conductor. Measurements were made on a standard ITER barrel in magnetic fields from 4.0 to 8.0 T and temperatures from 3.5 to 6.0 K. We investigated the effect of self-field by changing the direction of the transport current, resulting in an inward or outward Lorentz force acting on the strand. At 4.2 K and 5 T, the difference in the measured JC between the two Lorentz force polarities was about 1%. From this low value, we conclude that self-field effects in the Nb-Ti strand are about 40 % of those expected using standard self-field calculations for fully transposed multifilamentary strands, consistent with theoretical considerations for annular filament transposition.

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Publisher statement:© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Date accepted:07 February 2018
Date deposited:01 March 2018
Date of first online publication:21 February 2018
Date first made open access:23 March 2018

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