Features of electric explosion of foils in the current skinning mode
The aim of the work was to experimentally investigate the propagation of a of nonlinear diffusion wave of a magnetic field arising at an electrical explosion of foils in the current-cut mode. Experiments on an electric explosion of copper foil with a thickness of 100 μm and a width of 5 mm were carried out on a MIG's teravatt generator with a current amplitude of 2.5 MA and a rise time of 100 ns. It was shown that under these conditions, a plasma channel is formed on the longitudinal axis of the foil to approximately 75 ns from the beginning of the current. Estimates based on the amplification of the magnetic field at the edges of the foil showed that the nonlinear diffusion wave propagation from the edge of the foil to its center requires approximately 70-80 ns. Good agreement between experimental data and estimates led to the conclusion that the formation of the plasma channel is associated with the convergence of the nonlinear diffusion wave to the longitudinal axis of the foil.