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Title: Plate-like Dusty Structures in an e-Beam Sustained Glow Discharge at Atmospheric Pressure

Abstract

The paper is devoted to studying the dusty plasma created by the injection of dust particles into the atmospheric pressure gas ionized by an electron beam of 85-120 keV energy. The beam current density was varied within 0.1-1.0 mA/cm2. The electron gun operated in the stationary regime. The behavior of dusty particles lighted by a laser 'knife' was observed with a digital video camera. Stable plate-like structures were observed in the cathode sheath of non-self-sustained discharge. Numerical simulation was performed by using the non-local model of the non-self-sustained discharge.

Authors:
; ; ;  [1]
  1. Troitsk Institute for Innovation and Fusion Research, 142190 SRC RF TRINITI, TRINITI, Troitsk, Moscow region (Russian Federation)
Publication Date:
OSTI Identifier:
20726726
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 799; Journal Issue: 1; Conference: 4. international conference on the physics of dusty plasmas, Orleans (France), 13-17 Jun 2005; Other Information: DOI: 10.1063/1.2134580; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATMOSPHERIC PRESSURE; BEAM CURRENTS; BEAM-PLASMA SYSTEMS; CATHODES; COMPUTERIZED SIMULATION; CURRENT DENSITY; DUSTS; ELECTRON BEAMS; ELECTRON GUNS; GLOW DISCHARGES; KEV RANGE; PARTICLES; PLASMA; PLASMA DIAGNOSTICS; PLASMA SIMULATION; PLATES; TELEVISION CAMERAS

Citation Formats

Filippov, Anatoly V., Babichev, Valery N., Pal', Alexander F., and Starostin, Andrey N. Plate-like Dusty Structures in an e-Beam Sustained Glow Discharge at Atmospheric Pressure. United States: N. p., 2005. Web. doi:10.1063/1.2134580.
Filippov, Anatoly V., Babichev, Valery N., Pal', Alexander F., & Starostin, Andrey N. Plate-like Dusty Structures in an e-Beam Sustained Glow Discharge at Atmospheric Pressure. United States. doi:10.1063/1.2134580.
Filippov, Anatoly V., Babichev, Valery N., Pal', Alexander F., and Starostin, Andrey N. Mon . "Plate-like Dusty Structures in an e-Beam Sustained Glow Discharge at Atmospheric Pressure". United States. doi:10.1063/1.2134580.
@article{osti_20726726,
title = {Plate-like Dusty Structures in an e-Beam Sustained Glow Discharge at Atmospheric Pressure},
author = {Filippov, Anatoly V. and Babichev, Valery N. and Pal', Alexander F. and Starostin, Andrey N.},
abstractNote = {The paper is devoted to studying the dusty plasma created by the injection of dust particles into the atmospheric pressure gas ionized by an electron beam of 85-120 keV energy. The beam current density was varied within 0.1-1.0 mA/cm2. The electron gun operated in the stationary regime. The behavior of dusty particles lighted by a laser 'knife' was observed with a digital video camera. Stable plate-like structures were observed in the cathode sheath of non-self-sustained discharge. Numerical simulation was performed by using the non-local model of the non-self-sustained discharge.},
doi = {10.1063/1.2134580},
journal = {AIP Conference Proceedings},
number = 1,
volume = 799,
place = {United States},
year = {Mon Oct 31 00:00:00 EST 2005},
month = {Mon Oct 31 00:00:00 EST 2005}
}
  • More and more researchers have been attracted to the research of atmospheric pressure glow discharge (APGD) because of its great prospect in numerous industrial applications. Nevertheless, almost all of the industrial applications are based on achievement of stable, large-volume, and uniform APGD. In a previous study, stable filamentary APGD was obtained by applying a resonant power supply between pin-to-plate electrodes which could limit the peak value of discharge current to supress the glow-to-arc transition through a series-wound resonance principle. The filamentary APGD is centimeter-level in the length but only several millimeters in diameter. Therefore, in order to obtain large-volume andmore » uniform APGD, it is significant to study how to diffuse filamentary APGD in radial direction. With the increasing resonant frequency of alternating current discharge, excited particles (mainly including energetic electrons and trapped ions left from the previous half-cycle discharge) in the electrodes gap increase, which benefits obtaining stable self-sustaining APGD. In this paper, mechanism and law of the influence of resonant frequency on the diffusion of filamentary APGD in ambient air were studied. By comparing the photos of discharge plasma and waveforms of the discharge voltage and current, it is found that the volume of the glow discharge plasma enlarges as the resonant frequency of the power supply increases. It is very significant and anticipating to study how to obtain stable, large-volume, and uniform APGD in ambient air by the resonant power supply.« less
  • The experimental study of microwave-plasma interaction has been performed to demonstrate the transmission and attenuation of microwaves in atmospheric pressure glow discharge plasma. The cold-collisional plasma produced at atmospheric pressure can absorb the microwave energy because of its complex dielectric constant. The microwave of 10 GHz frequency was launched into the plasma and attenuation was measured as a function of electron plasma density, plasma thickness, electron-neutral collision frequency, etc. It was observed that the attenuation significantly depends on electron plasma density and thickness. The microwave attenuation measurement was also used as a diagnostic to estimate electron plasma density. It wasmore » validated by optical emission spectroscopic measurements with helium line intensity ratio method. Both the methods show good agreement.« less
  • A large-area (6 cm × 6 cm) air surface dielectric barrier discharge has been generated at atmospheric pressure by using well-aligned and micron-sized dielectric tubes with tungsten wire electrodes. Intensified CCD images with an exposure time of 5 ns show that the uniform surface air discharge can be generated during the rising and falling time of pulsed DC voltage. Current and voltage and optical measurements confirm the formation of glow-like air discharges on the surface of micron-sized dielectric tubes. Simulation results indicate that the microelectrode configuration contributes to the formation of strong surface electric field and plays an important role in the generation of uniformmore » surface air discharge.« less
  • Experimental study of plasma produced at the nitrogen pressure 0.2-1 Pa in the chamber volume V Almost-Equal-To 0.12 m{sup 3} as a result of injection into the chamber of a broad nitrogen molecule beam with 1-4 keV energy and 0.1-1 A equivalent current is carried out, and the study results are presented. Dependences of the plasma density distribution on the beam equivalent current I{sub b}, energy E{sub b}, and gas pressure p indicate a crucial role of fast molecules in gas ionization, and the probe characteristics reveal two groups of plasma electrons with the temperatures T{sub e} {approx} 0.4 eVmore » and T{sub e} {approx} 16 eV. Immersion in plasma of an electrode isolated from the chamber and application to the electrode of a positive voltage U result in non-self-sustained discharge. When U changes from {approx}0.5 to {approx}1.5 V, the discharge current I rapidly rises to a certain value I*, and after that the rate of rise dI/dU drops by an order of magnitude. At U {approx} 10 V, the current I rises to I{sub 0} Almost-Equal-To 1.5I*, and dI/dU once again drops by an order of magnitude. Current I{sub 0} specifies the number of electrons produced inside the chamber per second, and it grows up with E{sub b}, I{sub b}, and p. At U > 20 V, due to gas ionization by fast electrons emitted by the chamber and accelerated up to the energy {approx}eU in the sheath between the plasma and the chamber walls, the current I rises again. When U grows up to {approx}50 V, production of fast electrons with energies exceeding the ionization threshold begins inside the sheath, and the ionization intensity rises dramatically. At U > 150 V, contribution of fast electrons to gas ionization already exceeds the contribution of fast molecules, and the plasma density and its distribution homogeneity inside the chamber both grow up substantially. However, even in this case, the discharge is non-self-sustained, and only at U > 300 V it does not expire when the beam source is switched off.« less
  • The investigation of dust structure formed in glow discharge in an external longitudinal magnetic field with induction up to 400 G applied is presented in this work. The dust structure starts to rotate in the magnetic field. The angular-velocity magnitude is one to two orders larger than one in other discharge types. Its dependence on the magnetic field is nonmonotonic. The rotation direction inverses with an increase of the magnetic induction value up to a certain magnitude B{sub 0}. In close range of induction around B{sub 0} and under certain conditions the rotation of the upper and lower parts ofmore » the structure in the opposite direction is observed. Rotation is caused by the ion-drag force. The inversion of rotation direction relates with the change of plasma flows in the area of their formation in stratum with the magnetic field applied. The effect of ion flows was investigated in two additional experiments on the observation of structure rotation onset and on gravity-driven probing of stratum. The angular-velocity unhomogeniety allowed us to investigate shearing and to observe melting of the dust crystal. The correlation functions approach showed the occurrence of structure transformation and its phase transition of the meltinglike type in the magnetic field.« less