Speaker
Description
The Coated Conductor (CC) tapes appear to be promising for the production of magnets and cables due to their high critical magnetic field and temperature, as well as competitive critical current density, in combination with good mechanical properties. On the other hand, the superconducting layer may exhibit high energy dissipation in an external magnetic field due to the relatively large hysteresis AC losses resulting from the tape geometry. This could be a limiting factor of the ReBCO tapes application in a transient field specific to magnets. A significant impact on reducing AC losses is expected from tape filamentization, similar to the positive experience with using thin filaments in low-temperature superconducting wires. However, the ReBCO material must be covered with a metallic stabilizing layer to prevent the destructive effects of the atmosphere and to enhance the thermal and electrical stability of the wire, thereby reducing the effects of defects. The introduced coupling AC losses, caused by the transverse current between the superconducting filaments through the metallic stabilization, should then be carefully analyzed for future applications. The balance between the electrothermal stability of the conductor and the AC losses is achieved by selecting the correct parameters for the metallic stabilization layer. Here, we compare analytical and numerical (FEM) solutions for the AC losses estimation in round HTS cables, along with their verification through experiments.
