In this work, the propagation of the surface ionization wave (SIW) in the nanosecond pulsed surface dielectric barrier discharge with different dielectric materials and pulse repetition rates is investigated. The current waveforms at different locations along the route of the SIW propagation are obtained, based on a specially designed ground strip array geometry. The temporal evolution and spatial distribution of the electric field during the SIW propagation are measured by using the electric field induced second harmonic generation method. The distribution of the residual surface potential after the discharge is mapped with a Kelvin electrostatic probe, which verifies both the existence of the residual electric field and its opposite direction to that during the SIW propagation. It is found that with the dielectric material on which the surface charges decay faster, there are the well-pronounced primary and secondary SIWs with a higher velocity on the voltage rising edge and both the peak current and the peak electric field are also higher, with a less spatial attenuation along the SIW propagation route. It is demonstrated that the residual surface charges with the same polarity as the high-voltage pulse suppress the development of the SIW.
A new quasi-one-dimensional model for a negative corona in air is formulated allowing for the quantitative description of the mechanism of Trichel-pulse formation. Detailed analysis of the processes controlling pulse dynamics is made. Comparison with experiment for a short-gap corona demonstrates a reasonable agreement with the shape of the pulse and in the average characteristics of the negative corona.
Obtaining new information about different forms of self-sustained dc discharges that can be realized in pin-to-plane electrode geometry in ambient air is the goal of this paper. Experimental and numerical calculation data uncovering the physics of the temporal and spatial evolution of the negative corona and glow discharge (GD), with increase in current up to the transition to the spark, are presented. Special attention is paid to the properties of diffusive GD at atmospheric pressure, which is a necessary stage (steady-state or transient) preceding the spark and determining the threshold conditions of sparking.
The results of numerical calculations on a steady-state constricted discharge in N2 flow at atmospheric pressure are presented. Basic elementary processes responsible for sustaining the constricted discharge at low and high currents are found. It is shown that the charged particle generation in both regimes is controlled predominantly by an associative ionization
. However, metastable states are created in these regimes by different processes. In low-current discharge N2(A) and N2(a′) metastables are created due to mutual collisions of the vibrationally excited molecules, and their collision frequency is determined by the vibration energy distribution function. In high-current discharge these metastables are excited by energetic electrons, and inelastic collision frequency is determined by the electron energy distribution function. The charged particle dynamic balance in the high-current constricted discharge in atmospheric pressure N2 is non-local and sustained by ionization and ambipolar diffusion like that in a low-current diffusive discharge in a tube at low pressure. It was demonstrated that blowing of the discharge by longitudinal gas flow leads to a more pronounced constriction.
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