Inverse problem of the current pulse reconstruction according to the penetration rate of electric field induced inside the tubular electrode

Summary form only given. A series of numerical simulations was carried out to study the evolution of hollow tube matter during exposition by submicrosecond current pulse with linear density of 1-3 MA/cm. The experiments with the same linear density were conducted on the Angara-5-1 installation. In this way the behavior of the electrodes under extreme energy and strength loads was simulated in those experiments and calculations. To obtain reliable results, the experimental time dependence of the current ought to be specified as boundary conditions during all time the process is modeled. However, the reliable current measurement was carried out within the first ~ 100 ns in these experiments. The evolution of tube material is of interest for a longer time period. To solve this problem the time dependence of current ought to be restored according to the time dependence of the electric field intensity, measured on the inner tube surface during 500 ns. For this purpose the inverse problem was solved; the data obtained were used in the MHD-simulation.