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Related Experiment Videos

Concentric-ring patterns in a dielectric barrier discharge system.

E L Gurevich1, A L Zanin, A S Moskalenko

  • 1Institut für Angewandte Physik, Corrensstrasse 2/4, D-48149 Muenster, Germany. gurevich@uni-muenster.de

Physical Review Letters
|November 13, 2003
PubMed
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Researchers observed a novel concentric-ring pattern in a gas discharge system. Increasing pressure caused the pattern to destabilize into filaments, influenced by charge carriers on electrodes.

Area of Science:

  • Plasma Physics
  • Nonlinear Dynamics
  • Materials Science

Background:

  • Dielectric barrier discharges (DBDs) are widely used in various applications.
  • Understanding pattern formation in DBDs is crucial for controlling plasma behavior.
  • Previous studies have focused on filamentary or homogeneous modes, with limited exploration of ordered patterns.

Purpose of the Study:

  • To report the first experimental observation of a concentric-ring pattern in a short planar dielectric barrier gas discharge (DBD).
  • To investigate the spatiotemporal dynamics and evolution of this unique discharge pattern.
  • To elucidate the role of surface charge accumulation in pattern formation and stability.

Main Methods:

  • Experimental setup utilizing a short planar dielectric barrier discharge system.

Related Experiment Videos

  • Systematic variation of gas pressure and electrical parameters.
  • High-speed imaging and diagnostic techniques to capture spatiotemporal behavior.
  • Analysis of charge carrier dynamics on dielectric surfaces.

    • Main Results:

    • Observation of a stable concentric-ring pattern under specific experimental conditions.
    • Demonstration of pattern destabilization into a filamentary structure with increasing gas pressure.
    • Correlation between surface charge deposition on dielectric electrodes and the observed spatiotemporal dynamics.
    • Identification of the transition mechanism from ordered ring patterns to chaotic filaments.

    Conclusions:

    • The concentric-ring pattern represents a novel discharge mode in planar DBDs.
    • Gas pressure and surface charge dynamics are critical factors governing pattern formation and stability.
    • This finding provides new insights into pattern formation mechanisms in gas discharges and offers potential for controlled plasma structuring.