Numerical Study of Screening Current on HTS Stellarator Coil and Experimental Validation Through Screening Current Induced Voltage

This study presents a numerical model for simulating screening current distribution in REBCO stellarator coils using a distributed-circuit approach with widthwise segmentation. By applying an equipotential assumption along the conductor‘s width, which can generally be applied, the model reduces the number of circuit elements, enabling efficient calculation of electromagnetic and thermal parameters such as current distribution and AC loss within a short time. Experimental validation using a 1/20-scale stellarator coil confirmed the model's accuracy in predicting the effects of screening current on voltage profiles during repeated operations. The results indicate that voltage measurements can effectively estimate screening currents in high-temperature superconducting (HTS) magnets.