Critical current and AC-loss for intentionally cracked REBCO split wires

Abstract

Tape shape of REBCO-coated conductor with a single-core structure is commercially available. However, the single core leads to a large AC-loss due to magnetization hysteresis. A multi-core structure can be used to reduce this loss. However, it is difficult to fabricate a long multi-core wire made of a REBCO-coated conductor because defects generated during the fabrication process lead to local decreases in the critical current. To obtain a large critical current throughout the wire, the critical current in each core should be maintained. However, local defects in most cores in a long wire reduce the critical current. This study proposes an intentionally cracked REBCO split wire that has a multi-core structure but without complete separation of the cores.