Abstract
The results of theoretical simulation of runaway electron generation in high-pressure pulsed gas discharge with inhomogeneous electric field are presented. Hydrodynamic and kinetic approaches are used simultaneously to describe the dynamics of different components of low-temperature discharge plasma. Breakdown of coaxial diode occurs in the form of a dense plasma region expanding from the cathode. On this background there is a formation of runaway electrons that are initiated by the ensemble of plasma electrons generated in the place locally enhanced electric field in front of dense plasma. It is shown that the power spectrum of fast electrons in the discharge contains electron group with the so-called “anomalous” energy.
Highlights
The phenomenon of runaway electrons generation in highpressure gas discharges is widely studied in recent years [1e4]
It is connected to the progress in the field of high-voltage pulse generation with a short rise time of the voltage amplitude and the appearance of experimental equipment with picosecond time resolution [1,2]
The main factor affecting the amount of fast electrons is the possibility of creating a strong overvoltage of a discharge gap at the initial stage of the current growth in the gas diode
Summary
The phenomenon of runaway electrons generation in highpressure gas discharges is widely studied in recent years [1e4]. At present the fact of fast (runaway) electrons detection can be firmly established at the initial stage of high pressure gas breakdown in gaps with strongly non-uniform distribution of the electric field. [4]) to coaxial geometry of subnanosecond discharge gap in sulfur hexafluoride (SF6) at atmospheric pressure This gas has a molecule with a high energy of electron affinity that facilitates rapid attachment of free electrons to the molecule forming stable negative ions. Attachment of free electrons leads to a significant increase of static breakdown value of the reduced electric field strength. For atmospheric pressure, it equals to 89 kV,cmÀ1,atm, which is more than twice higher of breakdown fields in pure nitrogen (35 kV,cmÀ1,atm). Complex molecule SF6 has a relatively high elastic cross-section, the high field strength allows us to observe a certain number of fast electrons [6,7]
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