2.超伝導体における電磁現象(<講座>超伝導技術I)

概要

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When the magnetic field is larger than the lower critical field, the magnetic flux penetrates into type-II superconductors; mixed state of superconducting part and normal part. Electromagnetic properties of the mixed state of type-II superconductors can be described well with critical state models. In critical state models, the magnetic field distribution and current distribution in superconductor are determined with the balance between Lorentz force and pinning force. With the Bean model, one of the critical state models, the hysteresis loss and thermo-magnetic instabilities in type-II superconductors are explained. When we make the superconductor thinner, the hysteresis loss decreases and thermo-magnetic instabilities is suppressed. Therefore, in multifilamentary superconductors, superconductor is divided to thin filaments. The basics of the electromagnetic properties of multifilamentary superconductors are also explained.
社団法人プラズマ・核融合学会の論文
1994-08-25