Refined circuit model for current distribution of the no-insulation HTS insert magnet

Detailed simulation can play a fundamental role in the design, manufacture, and operation of high-field magnets. This study introduces a new equivalent circuit simulation method for the no-insulation (NI) superconducting magnet. The refined circuit model (RCM) can describe the current distribution inside the REBa₂Cu₃O_7-δ (RE, rare earth elements) tapes in the equivalent circuit model. A single turn of REBCO tape was divided in both the width and length directions to achieve better results. A simulation model for a NI REBCO insert magnet was established through the RCM. Simulation results show that the screen current starts to saturate within 500 s during the excitation of the HTS magnet. The refined circuit model can help to make a more detailed mechanical analysis of the REBCO magnets. It can also guide the excitation of the HTS magnet and screen current reduction through real-time simulation.