Publication details for Dr Douglas HallidayRidgeon, F.J., Raine, M.J., Lakrimi, M., Thomas, A., Boutboul, T. & 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): 9001805.
- Publication type: Journal Article
- ISSN/ISBN: 1051-8223, 1558-2515
- DOI: 10.1109/TASC.2018.2808370
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Author(s) from Durham
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.