AC Losses of Copper Stabilized Multifilament YBCO Coated Conductors

TL;DR

This study investigates AC losses and critical current in copper-stabilized YBCO coated conductors with various filament widths, analyzing hysteresis and coupling losses to optimize superconducting performance.

Contribution

It provides experimental data on AC losses in multifilament YBCO conductors with different filament widths and discusses methods to reduce coupling losses through processing improvements.

Findings

AC losses depend on filament width and sweep rate.

Striation with superconducting bridges affects current sharing.

Processing parameters influence coupling loss reduction.

Abstract

We report the data on magnetization losses and critical current of multifilament copper stabilized coated conductors. Eight centimeters long samples of copper stabilized YBa2Cu3O7-x (YBCO) coated conductors manufactured commercially were subdivided into superconducting filaments by near-IR laser micromachining. The width of the superconducting stripes was varied from 0.2 mm to 0.04 mm. Some of the samples were striated leaving superconducting bridges for current sharing between the filaments. The AC losses were measured at different sweep rates of the magnetic field up to 14 T/s. We will present the results for the hysteresis and coupling losses and discuss the means to reduce the coupling loss by changing the processing parameters of micromachining and by post-ablation treatment.