横向振荡磁场作用下磁涂层超导管状导线磁滞交流损耗的有限元模拟
Finite-element simulations of hysteretic ac losses in a magnetically coated superconducting tubular wire subject to an oscillating transverse magnetic field
摘要：
在准静态方法内，调用COMSOL有限元软件包和利用静磁-静电模拟的管状超导体/顺磁体异质结构的滞后交流损耗进行振荡的横向磁场的数值模拟。结果表明，当同轴顺磁支撑置于超导管内部时，同轴顺磁支撑对薄的II型超导管的单侧磁屏蔽导致滞后交流损耗比真空环境下略有增加;然而，随之而来的是惊人的屏蔽效应，可能会将滞后交流损耗降低几个数量级，这取决于当支撑体放置在外部时所施加的磁场的磁导率和幅度。
英文摘要：
Numerical simulations of hysteretic ac losses in a tubular superconductor/paramagnet heterostructure subject to an oscillating transverse magnetic field are performed within the quasistatic approach, calling upon the COMSOL finite-element software package and exploiting magnetostatic-electrostatic analogues. It is shown that one-sided magnetic shielding of a thin, type-II superconducting tube by a coaxial paramagnetic support results in a slight increase of hysteretic ac losses as compared to those for a vacuum environment, when the support is placed inside; a spectacular shielding effect with a possible reduction of hysteretic ac losses by orders of magnitude, however, ensues, depending on the magnetic permeability and the amplitude of the applied magnetic field, when the support is placed outside.
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