Collisionless scenario of multi-component cathode plasma expansion in vacuum diode
Kozhevnikov V. Y.
1, Kozyrev A.1, Kokovin A. O.
1
1Institute of High Current Electronics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia
Email: v.y.kozhevnikov@yandex.ru, av.kozyrev@hcei.ru, ao.kokovin@hcei.ru
Based on the fundamental physical kinetics of plasma, the concept of a collisionless scenario of expansion of a multi-component cathode plasma in a vacuum gap to which an external voltage is applied is demonstrated. It is shown that the pulse-periodic mode of plasma emission does not change the previously identified electrodynamics of the current-carrying plasma expansion, but generates a non-stationary profile of the electric potential in the gap in the form of a so-called "potential hump". Within the framework of the basic scenario, it is shown that the calculated plasma expansion speeds are in good agreement with the experimentally observed data, and for ions of different charge multiplicities. Calculation of the electron beam kinetics showed that the current density in a planar vacuum diode with a plasma cathode is several times higher than the estimate of the Child-Langmuir current density. The application of kinetic theory allows us to reveal the fundamental properties of the ECtonic mechanism of explosive electron emission both in the general process of plasma expansion and in the self-consistent dynamics of the distribution functions of electrons, singly and doubly charged ions Keywords: vacuum discharge, physical kinetics of plasma, plasma cathode, ions in a vacuum arc.
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