Dielectric barrier discharges (DBDs) occur in the presence of at least one insulating layer in contact with the discharge between two planar or cylindrical electrodes connected to a high voltage supply. A quartz coaxial DBD tube, filled with argon, has been studied and an electrical model characterizing the discharges has been proposed. The proposed model considers the geometry of the DBD tube, gas gap spacing and the properties of the dielectric barrier material. A sinusoidal voltage up to 2.4 kV peak with frequencies from 20 to 100 kHz has been applied to the discharge electrodes for the generation of microdischarges. By comparisons of visual images and electrical waveforms, the filamentary discharges have been confirmed. The simulated discharge characteristics have been validated by the experimental results. A good correlation between the experimental and simulated results was found, which is used to deduce the circuit impedance and other electrical parameters, in particular, the conduction current, charge accumulation, energy deposited and consumed power during discharges.
This paper describes an extension of a basic single microhollow cathode discharge (MHCD) to a tandem MHCD, i.e., two discharges in series from an anode–cathode–anode configuration. When a high-voltage pulse is superimposed with a direct current (DC) tandem MHCD, an intense excimer emission along the discharge axis in a high pressure xenon gas is generated which is two orders of magnitude higher than that of the DC tandem MHCD. In addition, the emission intensity increases to almost twice by increasing cathode thickness from 250 to 1000 µm. The emission is further enhanced by increasing the gas pressure from 400 to 800 mbar.
Different electric circuits for triggering the switch with a trigger unit based on an auxiliary glow discharge are discussed. Most attention is concentrated on the recent experimental results on low voltage triggering of the switch and on the mechanisms for the main discharge initiation under the action of the trigger pulse. Due to modifications in the trigger electric circuit, the switch is triggered starting from a voltage of 50 V at a current level in the trigger circuit of 10 mA. With a voltage of 200-250 V and a trigger current of about 0.25 A, the delay time to triggering does not exceed 200 ns.Index Terms-Anode voltage drop region, cathode voltage drop region, hollow cathode pulsed discharge, pseudospark switch, steady state glow discharge.
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