Abstract
The main physical processes occurring in plasma electron source with large cross-section beam are shown. The main factors influencing the emission properties of the plasma emitter are revealed. A physical–mathematical model of the plasma emitter is presented, in which emission plasma formation conditions in the electrode-expander are considered. On the basis of modelling and experimental research carried out it is shown that electric fields caused by both high working pressure and intensive electron extraction from a plasma can form in the plasma. It is shown that with an increase in critical pressure the electrode-expander goes into the active regime which can be used to increase emission current density with plasma sources development. A double-grid method of emission current stabilization is proposed, which ensures the stability of plasma emitter parameters at high pressures.
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