Complete electromagnetic-thermal-dynamic-damage modelling and equation of state for tantalum single-turn coil

Abstract Single-turn coil (STC) is a destructive pulsed magnet aiming at ultra high magnetic field. Considering that tantalum has higher mass density, the conductor shock deformation can be suppressed and the magnetic field can be increased by using tantalum conductor. In this study, the electromagnetic-thermal-dynamic-damage coupling model for tantalum STC is proposed. Based on this model, the conductor melting, shock deformation, and electromagnetic diffusion effect are analysed. In addition, the mechanism by which tantalum conductor can increase the magnetic field is explained at the theoretical level of transient discharge circuits by comparing tantalum conductor with copper conductor. The model accuracy is validated by comparing with experimental data.