Electromagnetic calculations of axially stacked pulsed high-field magnets

Abstract Pulsed magnets producing 45–100 T magnetic fields with millisecond pulse durations are essential tools for advanced research in condensed matter physics and materials science. Conventional radially nested multi-coil systems, however, suffer from high inductance, strong electromagnetic coupling, and excessive energy consumption, which limit the achievable magnetic field. To overcome these limitations, a novel axially stacked pulsed magnet configuration is proposed. Investigating its electromagnetic and thermal responses requires an efficient multi-physics computational framework. Existing rapid-computation tools, such as PMDS, which assume coaxial and parallel coils, are unsuitable for this topology, while commercial finite-element software often involves long computation times and convergence issues. To address these challenges, a dedicated numerical framework is developed, integrating circuit equations, magnetic-field diffusion, and heat conduction, while accounting for magnetoresistance and eddy-current effects. A MATLAB-based code is validated against COMSOL simulations, demonstrating deviations below 2%. In a 95 T case study, the axially stacked design reduces self and mutual inductances by over 60%, decreases energy demand by 60%, and shortens pulse width by 36%. The proposed axially stacked topology offers a new pathway toward realizing ultra-high-field pulsed magnets exceeding 100 T.