Stochastic Analysis on the Factors Affecting Critical Current and Index Value of Multi-Tape Co-Wound NI HTS Coil

The estimation of critical current ($I_{\rm{c}}$) 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$I_{\rm{c}}$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 77K self-field$I_{\rm{c}}$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$I_{\rm{c}}$and index value …