Numerical investigations of formation and realignment of regular current structures in elevated pressure glow discharge

R. Sh. Islamov

doi:10.1117/12.464166

30 April 2002 Numerical investigations of formation and realignment of regular current structures in elevated pressure glow discharge

R. Sh. Islamov

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Proceedings Volume 4644, Seventh International Conference on Laser and Laser-Information Technologies; (2002) https://doi.org/10.1117/12.464166
Event: Seventh International Conference on Laser and Laser Information Technologies, 2001, Vladimir, Suzdal, Russian Federation

Abstract

Within the frame of a fluid drift-diffusion model the possibility of a current instability growth in elevated gas discharge was numerically investigated. Under physically reasonable assumptions about the values of characteristic electron energy and secondary emission coefficient, we observed the growth of perturbations and formation of a periodic in space current structure. However, competition between the current stripes has a substantial effect on their evolution, leading to suppressing of the neighboring current stripes. Further inspection of numerical solution discloses that the instabilities growth begins in anode region, but the net result essentially depends on the processes in cathode region. The cathode spots are markedly less in size than the anode spots, and their current densities differ widely. To account for several phenomenological aspects of formation of constricted discharge structures and cooperative interplay thereof, a simple one-dimensional physical model is proposed. It should be noted that a development of the current structures of the abnormal glow exhibits a nonthreshold nature and owes its origin to the purely electrodynamical phenomenon long before the emergence of the bulk thermal, plasma chemistry, and nonlinear surface effects.

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R. Sh. Islamov "Numerical investigations of formation and realignment of regular current structures in elevated pressure glow discharge", Proc. SPIE 4644, Seventh International Conference on Laser and Laser-Information Technologies, (30 April 2002); https://doi.org/10.1117/12.464166

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KEYWORDS

Plasma

Numerical analysis

Chemistry

Electrodes

Inspection

Ionization

Ions

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