Speaker
Description
High-temperature superconducting REBCO coated conductors are promising for applications in high-field magnets due to their high critical current and electromagnetic performance. However, screening currents in these conductors generate undesirable effects such as screening current-induced fields (SCIF), leading to magnetic field drift, and internal stress, limiting their use in large-scale magnet. This study focuses on mitigating SCIF through narrow-stacked multifilamentary designs. By using the T-A formulation, a finite element model was developed to simulate electromagnetic behavior under varying configurations, including single-tape, monolithic multifilamentary, and narrow-stacked structures. Simulation results demonstrate that narrow-stacked layouts effectively suppress multilayer screening effects, leading to significant SCIF reduction. To improve cost-effectiveness, groove number and distribution were further optimized. In monolithic structures, increasing grooves beyond three per layer resulted in less than 7% additional SCIF suppression, indicating diminishing returns. Placement strategies showed that grooves near the tape edge or in medial layers provided better performance under limited groove counts. Nevertheless, in complex arrangements, inter-filament coupling weakened these benefits, suggesting the need for more advanced design rules. These insights contribute to the development of REBCO tapes with improved magnetic field stability and reduced fabrication costs, promoting broader application in industrial and medical superconducting systems.
