Influence of the voltage polarity on the properties of a nanosecond surface barrier discharge in atmospheric-pressure ai
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TEMPERATURE PLASMA
Influence of the Voltage Polarity on the Properties of a Nanosecond Surface Barrier Discharge in AtmosphericPressure Air M. M. Nudnovaa, N. L. Aleksandrova, and A. Yu. Starikovskiib a
Moscow Institute of Physics and Technology, Institutskiі per. 9, Dolgoprudny, Moscow oblast, 141700 Russia b Drexel University, 3141 Chestnut St., Philadelphia, PA, 19104 USA Received June 17, 2009
Abstract—The properties of a surface barrier discharge in atmosphericpressure air at different polarities of applied voltage were studied experimentally. The influence of the voltage polarity on the spatial structure of the discharge and the electric field in the discharge plasma was determined by means of spectroscopic mea surements. It is found that the energy deposited in the discharge does not depend on the voltage polarity and that discharges of positive polarity are more homogenous and the electric fields in them are higher. DOI: 10.1134/S1063780X10010071
air between the highvoltage and lowvoltage elec trodes (see Fig. 2) made of a 0.05mmthick, 5mm wide, and 80mmlong aluminum foil. The dielectric separating the electrodes was a fivelayer polyvinyl chloride film with a total thickness of 0.6 mm or a Teflon monolayer with a thickness of 0.3 mm. The lower electrode was inbuilt in a dielectric plate. The discharge was excited using a PAKM pulsed highvoltage generator with magnetic compression and an FIDbased nanosecond generator. The ampli tude of the highvoltage pulse at the output of the PAKM generator could be varied in the range 10– 20 kV. The rise time and FWHM of the highvoltage pulse were 7.5 and 22 ns, respectively (see Fig. 3a). The generator could operate in a singlepulse mode and a repetitive mode with a repetition rate of up to 100 Hz. The voltage amplitude at the output of the FID based nanosecond highvoltage generator FID was up to 12 kV, and the rise time and FWHM of the high voltage pulse were 3 and 7 ns, respectively (see Fig. 3b). The highvoltage pulse was fed to the dis charge system via an RC502413 cable. The param eters of highvoltage pulses were monitored using a return current shunt inbuilt in the middle of the cable in the break of the cable braid (see Fig. 1). To study the spatiotemporal characteristics of the discharge, it was photographed with a nanosecond exposure by using a PicoStar HR12 LaVision high speed CCD camera with a Helios44M lens. The min imum exposure of the camera was 200 ps, and the operating spectral range of the system was 350– 800 nm. In our experiments, the camera was focused perpendicularly to the discharge gap onto a plane par allel to the electrodes. The reduced electric field E/N in the discharge (where N is the density of neutral particles) was deter
1. INTRODUCTION A surface barrier discharge (SBD) is a discharge that develops along the surface of a dielectric separat ing two electrodes. The voltage is applied to one of the electrodes, while the other is usually grounded. In recent years, SBDs have attracted considerable atten t
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