PROJECT TITLE :

Characterization of a Cold Atmospheric Pressure Plasma Jet Device Driven by Nanosecond Voltage Pulses

ABSTRACT:

The structure, fluid-dynamic behavior, temperature, and radiation emission of a cold atmospheric pressure plasma jet driven by high-voltage pulses with rise time and length of some nanoseconds have been investigated. Intensified charge-coupled device (iCCD) imaging revealed that the discharge starts when voltage values of 5–10 kV are reached on the rising front of the applied voltage pulse; the discharge then propagates downstream the source outlet with a velocity around $10^7$ – $ten^8$ cm/s. Light emission was observed to extend and reduce periodically and repetitively throughout discharge propagation. The structure of the plasma plume presents a single front or either several branched subfronts, relying on the operating conditions; merging results of investigations by means that of Schlieren and iCCD imaging suggests that branching of the discharge front occurs in spatial regions where the flow is turbulent. By means that of optical emission spectroscopy, discharge emission was observed within the ultraviolet-visible (UV-VIS) spectral vary (N2, N2+, OH, and NO emission bands); total UV irradiance was under 1 $mu $ W/ $mathrmcm^2$ even at short distances from the device outlet (

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