Numerical simulation of picosecond magnetic compression lines

Magnetic compression lines (MCLs) are promising solid-state devices for producing picosecond pulses with power of tens of gigawatts. This paper describes a numerical model of MCL based on the coupled solution of Maxwell's equations and Landau-Lifshitz-Gilbert equation in the COMSOL Multiphysics software package. The used boundary conditions, solver settings, and finite element mesh settings are described. An explicit method for taking into account losses in line conductors for time domain calculations is proposed. The model is implemented in two-dimensional axisymmetric and three-dimensional formulations.After optimization, the model shows good agreement with experimental data. Using the created model, the influence of ohmic losses and higher-order modes on the formation of a pulse in the MCL was analyzed.