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Title: Kinetics of charged particles in a high-voltage gas discharge in a nonuniform electrostatic field

Abstract

A high-voltage gas discharge is of interest as a possible means of generating directed flows of low-temperature plasma in the off-electrode space distinguished by its original features [1–4]. We propose a model for calculating the trajectories of charges particles in a high-voltage gas discharge in nitrogen at a pressure of 0.15 Torr existing in a nonuniform electrostatic field and the strength of this field. Based on the results of our calculations, we supplement and refine the extensive experimental data concerning the investigation of such a discharge published in [1, 2, 5–8]; good agreement between the theory and experiment has been achieved. The discharge burning is initiated and maintained through bulk electron-impact ionization and ion–electron emission. We have determined the sizes of the cathode surface regions responsible for these processes, including the sizes of the axial zone involved in the discharge generation. The main effect determining the kinetics of charged particles consists in a sharp decrease in the strength of the field under consideration outside the interelectrode space, which allows a free motion of charges with specific energies and trajectories to be generated in it. The simulation results confirm that complex electrode systems that allow directed plasma flows to be generatedmore » at a discharge current of hundreds or thousands of milliamperes and a voltage on the electrodes of 0.3–1 kV can be implemented in practice [3, 9, 10].« less

Authors:
; ;  [1]
  1. Korolev Samara National Research University (Russian Federation)
Publication Date:
OSTI Identifier:
22617083
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 124; Journal Issue: 1; Other Information: Copyright (c) 2017 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CATHODES; CHARGED PARTICLES; ELECTRIC POTENTIAL; ELECTRON EMISSION; ELECTRONS; ELECTROSTATICS; IONIZATION; NITROGEN; SIMULATION; SURFACES; TRAJECTORIES

Citation Formats

Kolpakov, V. A., E-mail: kolpakov683@gmail.com, Krichevskii, S. V., and Markushin, M. A. Kinetics of charged particles in a high-voltage gas discharge in a nonuniform electrostatic field. United States: N. p., 2017. Web. doi:10.1134/S106377611613015X.
Kolpakov, V. A., E-mail: kolpakov683@gmail.com, Krichevskii, S. V., & Markushin, M. A. Kinetics of charged particles in a high-voltage gas discharge in a nonuniform electrostatic field. United States. doi:10.1134/S106377611613015X.
Kolpakov, V. A., E-mail: kolpakov683@gmail.com, Krichevskii, S. V., and Markushin, M. A. Sun . "Kinetics of charged particles in a high-voltage gas discharge in a nonuniform electrostatic field". United States. doi:10.1134/S106377611613015X.
@article{osti_22617083,
title = {Kinetics of charged particles in a high-voltage gas discharge in a nonuniform electrostatic field},
author = {Kolpakov, V. A., E-mail: kolpakov683@gmail.com and Krichevskii, S. V. and Markushin, M. A.},
abstractNote = {A high-voltage gas discharge is of interest as a possible means of generating directed flows of low-temperature plasma in the off-electrode space distinguished by its original features [1–4]. We propose a model for calculating the trajectories of charges particles in a high-voltage gas discharge in nitrogen at a pressure of 0.15 Torr existing in a nonuniform electrostatic field and the strength of this field. Based on the results of our calculations, we supplement and refine the extensive experimental data concerning the investigation of such a discharge published in [1, 2, 5–8]; good agreement between the theory and experiment has been achieved. The discharge burning is initiated and maintained through bulk electron-impact ionization and ion–electron emission. We have determined the sizes of the cathode surface regions responsible for these processes, including the sizes of the axial zone involved in the discharge generation. The main effect determining the kinetics of charged particles consists in a sharp decrease in the strength of the field under consideration outside the interelectrode space, which allows a free motion of charges with specific energies and trajectories to be generated in it. The simulation results confirm that complex electrode systems that allow directed plasma flows to be generated at a discharge current of hundreds or thousands of milliamperes and a voltage on the electrodes of 0.3–1 kV can be implemented in practice [3, 9, 10].},
doi = {10.1134/S106377611613015X},
journal = {Journal of Experimental and Theoretical Physics},
number = 1,
volume = 124,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2017},
month = {Sun Jan 15 00:00:00 EST 2017}
}
  • It is shown that a volume discharge is formed in a nonuniform electric field for the short leading edge of a voltage pulse and nanosecond pulse duration without any additional preionisation source in various gases at pressures higher than atmospheric (6 atm in helium and 3 atm in nitrogen). Lasing at atomic transitions in Xe is obtained in an Ar-Xe mixture under a pressure of 1.2 atm for an active length of 1.5 cm. A record-high specific power input (more than 0.8 GW cm{sup -3} under a pressure 1 atm in air) is realised in the volume discharge stage. Themore » volume discharge is formed due to preionisation of the discharge gap by fast electrons accelerated due to amplification of the electric field in the cathode region and in the gap. In a nonuniform electric field, volume discharge is realised under a quasistationary voltage from 10 to 180 kV across the gap, at a pulse repetition rate of up to 160 Hz and for various discharge gap geometries. (active media)« less
  • Glow discharge with electron confinement in an electrostatic trap has been studied. The trap is formed by a cylindrical hollow cathode, as well as by a flat target on its bottom and a grid covering its output aperture, both being negatively biased relative to the cathode. At a gas pressure of 0.2–0.4 Pa, the fraction of ions sputtering the target (δ = 0.13) in the entire number of ions emitted by the uniform discharge plasma corresponds to the ratio of the target surface area to the total surface area of the cathode, grid, and target. When a nonuniform magnetic fieldmore » with force lines passing through the target center (where the magnetic induction reaches 35 mT), as well as through the grid, hollow cathode, and target periphery (where the field lines are arc-shaped), is applied to the trap, its influence on the discharge depends on the magnetic induction B{sub 0} at the target edge. At B{sub 0} = 1 mT, the electrons emitted from the target periphery and drifting azimuthally in the arc-shaped field insignificantly contribute to gas ionization. Nevertheless, since fast electrons that are emitted from the cathode and oscillate inside it are forced by the magnetic field to come more frequently to the target, thereby intensifying gas ionization near the latter, the fraction δ doubles and the plasma density near the target becomes more than twice as high as that near the grid. At B{sub 0} = 6 mT, the contribution of electrons emitted from the target surface to gas ionization near the target grows up and δ increases two more times. At cathode-target voltages in the range of 0–3 kV, the current in the target circuit vanishes as the voltage between the anode and the cathode decreases to zero.« less
  • A numerical investigation was made of the influence of the magnetic field of the plasma current on the distribution of the specific power deposited in a gas discharge excited by an electron beam. Both steady-state and time-dependent solutions were obtained. It was found that at high values of the beam current density the current-voltage characteristics tended to saturate. This effect was caused by compression of the fast electron beam by the magnetic field and by enhancement of quadratic volume recombination.