Flux penetration of an HTS coated-conductor tape by an approaching permanent magnet
نویسندگان
چکیده
Interactions between inhomogeneous magnetic fields and a superconductor lie at the heart of several high-temperature superconducting (HTS) devices. An example is situation where field from small permanent magnet (PM) applied to coated-conductor HTS tape, such that flux penetrates superconductor. The PM highly spatially inhomogeneous, there significant variation in magnitude direction across tape. This leads varying local critical current density, Jc(B , ? ), consequently different ‘shielding’ (magnetic penetration) behaviour than case for uniform field. Here, we report results measurements numerical simulations penetrating within an tape which occur as dipole approaches distance. Electromagnetic were performed using finite-element model based on H -formulation, incorporated experimentally-measured anisotropic ) properties showed good agreement with experimental measurements. effects key modelling assumptions parameters then studied, including changing widths ). inhomogeneity characteristic gull-wing distribution elevated fields. Close approach suppresses Jc centre this observation maxima total shielding currents circulating A figure merit introduced uses effect provide threshold definition ‘full penetration’ by
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ژورنال
عنوان ژورنال: Superconductivity
سال: 2022
ISSN: ['2772-8307']
DOI: https://doi.org/10.1016/j.supcon.2022.100026