Abstract
In this paper we perform an accurate time-dependent finite-element numerical gas discharge simulation in two-dimensional semi-periodic computational geometry of the gas diode with a plane-grid cathode system. The diode configuration we investigate is similar to previously studied experimentally. Discharge simulation is performed in the framework of two-moment macroscopic (hydrodynamic) discharge plasma model accounting photoionization and autoelectronic emission from nonuniform electrodes surfaces. The results of numerical calculations can be used for further estimations of a runaway electron flows characteristics.
Highlights
The intensive development of modern experimental techniques for the investigating of fast processes in various gas discharges makes it possible to discover a large number of practical applications for a wide class of fundamental physical phenomena
One of the most significant fundamental phenomenon in gas discharge physics is the electron runaway in high-pressure gases [1]. It is represented by the generation of high-energy electron flows that proceed into the regime of continuous acceleration by overcoming the decelerating force caused by various collisions with the molecules or atoms of gaseous medium
The runaway electron beams are high-current electron flows having a subnanosecond duration with wide energy spectra [4]. This allows using fast gas discharges as a prospective compact sources of ultra-short powerful X-ray pulses. According to this a high-voltage nanosecond discharge must occur in a specific configuration of gas diode providing high output characteristics of the output runaway electron beam
Summary
The intensive development of modern experimental techniques for the investigating of fast processes in various gas discharges makes it possible to discover a large number of practical applications for a wide class of fundamental physical phenomena. The runaway electron beams are high-current electron flows having a subnanosecond duration with wide energy spectra [4] This allows using fast gas discharges as a prospective compact sources of ultra-short powerful X-ray pulses. According to this a high-voltage nanosecond discharge must occur in a specific configuration of gas diode providing high output characteristics of the output runaway electron beam. The main objective of this theoretical study is to investigate the instant characteristics of the discharge plasma in the diode with plane-grid cathode system in order to provide input parameters for the hybrid kinetic model interface for the runaway electron beam parameters estimations. Further evaluation of runaway electron beam parameters can be provided by using the hybrid kinetic approach described in [7]
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