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(a) Schematic presentation of experimental setup and (b) typical image of plasma jet for , He flow of 15 l/min.
(a) Scattering signal from the jet and voltage waveform. Rectangles A, B, and C indicate exposition windows when ICCD images were taken. (b) ICCD images of jet at A, B and C, plasma bullet velocity is . (c) Discharge and jet currents at different positions. Shaded bar on left indicates time when streamer exists. During this time, first peak in scattering signal and peak were observed. Shaded bar on right indicates time after streamer passing, when signals from afterglow plasma column were registered. Second peak in scattering signal and jet current indicate presence of the afterglow plasma column with characteristic decay time of . All data for and He flow is 15l/min.
Delays of appearance of peak depending on the distance from the syringe exit. Simple electrical model shown in inset image allows to estimate average resistance of the jet to be .
Discharge current for different HV amplitudes. No discharge ignition was observed for . Voltage increase resulted in shift in to early times with respect to the phase of the applied voltage.
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