Magnetization Losses in Multifilament Coated Superconductors

TL;DR

This study investigates magnetization losses in multifilament coated superconductors, identifying hysteresis and coupling losses, and demonstrates a significant reduction in total losses compared to uniform conductors at high sweep rates.

Contribution

It provides a quantitative scaling method to separate and analyze hysteresis and coupling losses in superconductors under varying magnetic fields.

Findings

Coupling loss proportional to the square of the sweep rate.

Hysteresis loss proportional to the sweep rate.

Multifilament conductors reduce total magnetization losses by about 90%.

Abstract

We report the results of a study of the magnetization losses in experimental multifilament, as well as control (uniform), coated superconductors exposed to time-varying magnetic field of various frequencies. Both the hysteresis loss, proportional to the sweep rate of the applied magnetic field, and the coupling loss, proportional to the square of the sweep rate, have been observed. A scaling is found that allows us to quantify each of these contributions and extrapolate the results of the experiment beyond the envelope of accessible field amplitude and frequency. The combined loss in the multifilament conductor is reduced by about 90% in comparison with the uniform conductor at full field penetration at sweep rate as high as 3T/s.