35.4 T field generated using a layer-wound superconducting coil made of (RE)Ba2Cu3O7-x (RE = Rare Earth) coated conductor

TL;DR

This paper demonstrates a high-field (35.4 T) superconducting coil made from layered REBCO tape, achieving record magnetic fields with safe quenching and improved durability due to a novel polyester film insulation.

Contribution

It introduces a polyester film layer to prevent conductor delamination, enabling higher magnetic fields in REBCO coils without degradation.

Findings

Achieved 35.4 T magnetic field with a REBCO coil.

The polyester film prevents conductor delamination.

The coil quenched safely multiple times without damage.

Abstract

To explore the limits of layer wound (RE)Ba2Cu3O7-x (REBCO, RE = Rare Earth) coils in a high magnetic field environment > 30 T, a series of small insert coils have been built and characterized in background fields. One of the coils repeatedly reached 35.4 T using a single ~100 m length of REBCO tape wet wound with epoxy and nested in a 31 T background magnet. The coil was quenched safely several times without degradation. Contributing to the success of this coil was the introduction of a thin polyester film that surrounded the conductor. This approach introduces a weak circumferential plane in the coil pack that prevents conductor delamination that has caused degradation of several epoxy impregnated coils previously made by this and other groups.