Transient plasma discharges can be created in di erent electrode geometries and theuse of a coaxial electrodes can assist in initiating ignition at multiple points at the sametime to create volumetric ignition. The current study investigates discharge formation in acoaxial electrode in quiescent, atmoshpheric and non-reacting conditions. This is the rstsystematic study to understand the behavior of such a discharge as a function of di erentpulse parameters like pulse width (40-110 ns), repetition frequency (1-50 kHz) and inputvoltage (14-20 kV). Additionally, the polarity of the central electrode was changed betweenpositive and negative. An intensi ed ccd camera was used to visualize the discharge for-mation. The exposure of the camera is set to capture 500 discharges in a single frame. Thedischarges were found to behave di erently for positive and negative polarity discharges.The positive polarity discharge tends to form a strong arc and spins around the outercylinder which is con rmed using a high speed camera. The negative polarity dischargesform a uniform streamer discharge for most of the pulse parameters. The current studyhas provided an initial understanding of the dynamics of plasma discharges in a coaxialelectrode.
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