Oscillation modes of dc microdischarges with parallel-plate geometry
Ilija Stefanovi\'c, Thomas Kuschel, Nikola \v{S}koro, Dragana Mari\'c,, Zoran Lj Petrovi\'c, J\"org Winter
TL;DR
This study investigates two distinct oscillation modes in microdischarges with parallel-plate geometry, revealing their characteristics, transitions, and underlying chaotic behavior through experimental measurements and spectral analysis.
Contribution
It identifies and characterizes two oscillation modes in microdischarges, detailing their transition dynamics and spectral properties, which was not previously documented.
Findings
Relaxation oscillations occur between 1.23 and 2.1 kHz.
Free-running oscillations occur at around 7 kHz.
Transitions between modes are spontaneous and voltage-dependent.
Abstract
Two different oscillation modes in microdischarge with parallel-plate geometry has been observed: relaxation oscillations with frequency range between 1.23 and 2.1 kHz and free-running oscillations with 7 kHz frequency. The oscillation modes are induced by increasing power supply voltage or discharge current. For a given power supply voltage, there is a spontaneous transition from one to other oscillation mode and vice versa. Before the transition from relaxation to free-running oscillations, the spontaneous increase of oscillation frequency of relaxation oscillations form 1.3 kHz to 2.1 kHz is measured. Fourier Transform Spectra of relaxation oscillations reveal chaotic behaviour of microdischarge. Volt-Ampere characteristics associated with relaxation oscillations describes periodical transition between low current, diffuse discharge and normal glow. However, free-running oscillations…
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