Abstract
The mechanism of subnanosecond pulsed breakdown of nitrogen at the pressure in the range of 5–40 atm is analyzed using the Particle-in-Cell Monte Carlo collision model in the plane geometry. It is assumed that the primary electrons appear in the gap due to the field emission. It is obtained that the field-emitted electrons are only responsible for the generation of initial plasma, which transforms into the fast ionization wave. It is shown that the wave propagation to the anode does not depend on the electron emission. It is obtained that the discharge develops through the slow and fast stages. The first stage is the conventional fast ionization wave. The fast stage starts when the electric field between the ionization wave plasma and the anode starts exceeding the critical electric field necessary for runaway electrons generation. It is shown that the generation of these electrons changes drastically both the temporal and spatial discharge dynamics.
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