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Flux penetration of an hTS coated-conductor tape by an approaching permanent magnet

Superconductivity 2022年第4期4卷 41-50页

作者： R.w.Taylor T.Booth M.D.Ainslie h.w.weijers R.A.Badcock C.w.Bumby Paihau-Robinson Research Institute Victoria University of WellingtonLower Hutt 5010New Zealand MacDiarmid Institute Victoria University of WellingtonWellington 6140New Zealand Department of Engineering King’s College LondonLondon WC2R 2LSUnited Kingdom

Interactions between inhomogeneous magnetic fields and a superconductor lie at the heart of several high‐temperature superconducting(hTS)*** example is the situation where the magnetic field from a small permanent magnet(PM)is applied to a coated‐conductor hTS tape,such that flux penetrates the *** PM field is highly spatially inhomogeneous,such that there is significant variation in the applied field magnitude and direction across the *** leads to a varying local critical current density,J_(c)(B,θ),across the tape,and consequently different‘shielding’(magnetic flux penetration)behaviour than is the case for a uniform applied ***,we report results from measurements and numerical simulations of the penetrating magnetic field within an hTS coated‐conductor tape which occur as a PM dipole approaches from a *** simulations were performed using a finite‐element model based on the h‐formulation,and which incorporated experimentally‐measured anisotropic J_(c)(B,θ)Þproperties from a coated‐conductor *** showed good agreement with experimental *** effects of varying key modelling assumptions and parameters were then studied,including changing the widths of the PM and hTS tape and the magnitude of J_(c)(B,θ).The inhomogeneity of the PM field leads to a characteristic gull‐wing distribution of magnetic flux across the superconductor at elevated applied *** approach of the PM to the tape suppresses Jc in the centre of the tape,and this results in the observation of a characteristic maxima for the total shielding currents circulating in the tape.A figure of merit is introduced which uses this effect to provide a threshold definition for‘full flux penetration’of an hTS tape by an inhomogeneous dipole field.

关键词： Coated conductor high temperature superconductors hTS modelling Finite‐element method

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