Hysteresis and coupling loss in filamentized REBCO tapes

Use of coated conductor tapes from high-temperature superconductors is a possible way for better energy efficiency in large magnetic systems for particle accelerators or fusion tokamaks. Because the hysteresis loss in a time varying magnetic field is proportional to the tape width, a substantial gain is expected by splitting of the REBCO layer into parallel filaments. Usually, a metal layer is added to facilitate stable operation, albeit this conductive connection between filaments introduces a new kind of loss, known as coupling loss.