Hysteretic ac losses in a superconductor strip between flat magnetic shields

TL;DR

This paper calculates hysteretic ac losses in a superconductor strip influenced by flat magnetic shields, revealing how shield orientation significantly affects magnetic field penetration and energy loss.

Contribution

It introduces a model for hysteretic ac losses considering magnetic shield orientation, highlighting the impact of magnetic environment on superconductor energy dissipation.

Findings

Shield orientation alters magnetic field penetration.

Hysteretic ac losses increase with parallel shields.

Loss behavior resembles different configurations based on shield orientation.

Abstract

Hysteretic ac losses in a thin, current-carrying superconductor strip located between two flat magnetic shields of infinite permeability are calculated using Bean's model of the critical state. For the shields oriented parallel to the plane of the strip, penetration of the self-induced magnetic field is enhanced, and the current dependence of the ac loss resembles that in an isolated superconductor slab, whereas for the shields oriented perpendicular to the plane of the strip, penetration of the self-induced magnetic field is impaired, and the current dependence of the ac loss is similar to that in a superconductor strip flanked by two parallel superconducting shields. Thus, hysteretic ac losses can strongly augment or, respectively, wane when the shields approach the strip.