Computer simulation of influence of the ionization processes on dynamics of formation of electronic beams in plasma sources of the charged particles

Abstract

The elevated working pressure is an advantage of plasma emitters of electrons. At such a range of working pressure of plasma sources of electrons to neglect shock ionization of molecules of residual gas by beam electrons, and, hence, ion space charge in a gap of acceleration is impossible. Other distinctive feature of plasma sources of electrons are that the geometry and position of emitting surface of the plasma are not invariable given that the edge of emitting plasma settles down in those points of the gap in acceleration, where zero intensity of an electric field is established. Ionization processes in an acceleration gap of electron-optical systems with the plasma emitter and mobility of emitting surface of plasma result in change of distribution of potential in accelerating gap, in change of position and configuration of a plasma surface, that sets a trajectory of beam electrons, and, hence, influences formation and characteristics of an electron beam. A calculation algorithm of electron-optical systems with the plasma emitter at the elevated working pressure is developed. The developed algorithm was fixed in a basis of the programs created for numerical simulation of dynamics of conditions of formation of narrow and tubular electron beams.