Thermo-electromagnetic properties of a magnetically shielded superconductor strip: theoretical foundations and numerical simulations

摘要: Numerical simulations of thermo-electromagnetic properties a thin type-II superconductor strip surrounded by open cavity soft-magnetic shields and exposed to an oscillating transverse magnetic field are performed resorting the quasistatic approximation vector potential approach in conjunction with classical description conduction heat. The underlying definition superconducting constituent makes use extended ?smoothed? Bean model critical state, which includes temperature dependence induced supercurrent as well. delineation exploits reversible-paramagnet Langevin form, appropriate for magnetizations narrow Z-type loops, considers eddy currents too. coolant is envisaged acting like bath that instantly takes away surplus Based on Jacobian-free Newton?Krylov backward Euler scheme, numerical analysis at hand tailored problem high width/thickness aspect ratio strip. Assigning representative materials characteristics conditions applied field, main findings practically relevant magnet configuration include: (i)?an overall rise maximum tending saturation steady state above operating temperature, shielding lending increased stability smoothing profile along width strip; (ii)?a washing out induction lowering its strength, relaxation density increase tightening power loss reduction all inside hysteretic ac suffered seen be cut back or, most, converge unshielded strip, coupling merely playing insignificant part thereby.