Flux Jumps up to 17 T in ReBCO Tape Stack Cables and their Suppression with Increased Intertape Spacing

TL;DR

This study investigates flux jumps in ReBCO tape stack cables at high magnetic fields up to 30 T and demonstrates that increasing intertape spacing can effectively suppress these flux jumps, enhancing high-field application performance.

Contribution

It provides the first detailed magnetization measurements of ReBCO tape stacks up to 30 T and shows how intertape spacing can mitigate flux jumps in high magnetic fields.

Findings

Flux jumps occur up to 17 T in tape stacks.

Increasing intertape spacing suppresses flux jumps.

Suppression of flux jumps improves high-field magnet stability.

Abstract

The magnetization of ReBCO tape stacks and tape stack cables in high magnetic fields (up to 30 T) are not commonly reported. Here we report magnetization measurements of tape stack cables in magnetic fields up to 30 T at 4.2 K. We observed that flux jumps, commonly relegated to low field regimes for single tapes, persisted up to 17 T in tape stacks, an effect which could have substantial technological relevance for high field applications including fusion devices or accelerator magnets. On the other hand, with the use of small spacers, we could suppress flux jump behavior, in some cases eliminating jumps entirely. Our findings provide critical insights for the optimization of designs for ReBCO cables for high-field applications, including fusion magnets and particle accelerators.