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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
Published on: September 26, 2014
Spontaneous pattern formation in an effectively one-dimensional dielectric-barrier discharge system
1Department of Physics and Astronomy, Calvin College, Grand Rapids, Michigan 49546, USA.
Physical Review Letters
|October 21, 2000
Summary
Dielectric-barrier discharges in narrow tubes form regular filament patterns. Different spatial patterns correlate with specific discharge stages during voltage cycles, suggesting predictable dynamics.
Area of Science:
- Plasma physics
- Nonlinear dynamics
- Fluid dynamics
Background:
- Dielectric-barrier discharges (DBDs) are crucial in various applications, including ozone generation and pollution control.
- Understanding filamentary discharge behavior in confined geometries is essential for optimizing DBD devices.
- Previous studies have explored DBD patterns, but detailed analysis in narrow tubes is limited.
Purpose of the Study:
- To investigate the spatial and temporal dynamics of filamentary discharges in a narrow dielectric tube.
- To identify and characterize different stable and unstable discharge patterns.
- To correlate observed patterns with electrical measurements and propose a preliminary model for pattern formation.
Main Methods:
- Experimental setup using a narrow dielectric tube with electrodes on opposite sides.
- Observation of discharge filament patterns along the tube length.
- Time-resolved current measurements during the voltage cycle.
- Development of a preliminary model for pattern formation dynamics.
Main Results:
- Three distinct types of periodic spatial patterns of discharge filaments were observed.
- A disordered state with random filament firing was also identified.
- Specific numbers of discharge stages were found to correspond to each observed spatial pattern.
- The study provides a basis for further investigations into pattern-formation dynamics.
Conclusions:
- Filament stabilization at regular intervals occurs in DBDs within narrow tubes.
- The number of discharge stages is linked to the specific spatial pattern formed.
- A preliminary model is proposed, highlighting the need for advanced imaging and surface charge studies.
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