Forming of structures during wire array compression

Summary form only given. 2D radiation MHD simulations show that mass flows from separate wires join at the half of radius. To understand this phenomenon a sequence of 2D simulation runs have been done: 1) pure hydrodynamics without magnetic field and radiation transport; 2) including magnetic field; 3) including radiation transport. It is obtained that two factors plays an important role: development of hydroinstabilities (Kelvin, RT and RM) and "frozen-in" magnetic field. The "cold start" of separate wire explosion in an array has been the subject of interest in order to understand the implosion dynamics. Mass inflow dependence on initial distance between wires is analyzed. The complicated dynamic structure of exploded wire determines the mechanism of plasma entrainment from single wire towards the axis. The dense core formed at the axis of single wire is surrounded by liquid-vapor mixture with strong perturbations. Wide range equation of state accounting metastable properties and elastic-plastic properties of matter has been used. Calculations show that the mixture is the result of overheating instability. The interaction of shock wave generated by neighboring wire and media with different densities leads to MHD instabilities. Results of numerical simulation have been compared with experimental data obtained on generator ANGARA (TRINITI, Russia) and with the data calculated by using the model of delaying of plasma formation. Dependence of processes on power input rate has been estimated.