Speaker
Description
The estimation of critical current ($I_c$) and the index value for single-tape wound coils and magnets is relatively straightforward. However, for multi-tape co-wound coils, the process becomes complex due to various factors influencing current distribution within the coil. This study conducts a numerical analysis to explore these factors and their impact on the $I_c$ and index value of multi-tape co-wound HTS coils. An equivalent circuit model, the multi-tape turn distributed circuit, is utilized to represent each tape turn in the coil. Key parameters such as the 77 K self-field $I_c$ of REBCO (Rare Earth Barium Copper Oxide) tape, its index value, contact resistance, and lead resistance are treated as variables during the charging simulation. A stochastic approach is employed to analyze the relationship between these parameters and the coil's $I_c$ and index value through multiple simulations using randomly generated parameter values. The results demonstrate a strong correlation between the coil $I_c$ and the average $I_c$ of the REBCO tapes. Furthermore, the coil index value is found to be significantly influenced by the average contact resistivity between the REBCO tapes.
