Volume 130, Number 6, June 2020
|Number of page(s)||7|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||21 July 2020|
Features of the cathode plasma formation at the initial stage of a nanosecond spark discharge in air
1 All- Russia Research Institute of Experimental Physics, Russian Federal Nuclear Center - Sarov, 607190, Russia
2 Dagestan State University - 43a Gadzhiyev str., Makhachkala, 367000, Russia
3 Joint Institute for High Temperatures of RAS - 13, bldg. 2 Izhorskaya str., Moscow, 125412, Russia
Received: 26 March 2020
Accepted: 18 June 2020
Nanosecond discharges at atmospheric pressure have a wide range of applications. The features of a nanosecond spark discharge formation strongly depend on the discharge gap geometry and the applied voltage. The present paper contains the results of near-electrode processes investigation at the initial stage of a spark discharge in air in the pin-to-plate geometry. Extra-high electron concentration in the range of was obtained based on the Mach-Zehnder interferometer after breakdown near the surface of a flat cathode. It is confirmed that the discharge channel is a multitude of microchannels that close the discharge gap. Analysis of a flat electrode surface after breakdown shows that the channel binding region is a cluster of microcraters with diameter from 5 to . A model for the gas dynamics processes at the initial stage of a nanosecond spark discharge is proposed.
PACS: 52.25.Jm – Ionization of plasmas / 52.80.-s – Electric discharges
© EPLA, 2020
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