Features of the cathode plasma formation at the initial stage of a nanosecond spark discharge in air

K. I. Almazova; A. N. Belonogov; V. V. Borovkov; V. S. Kurbanismailov; Z. R. Khalikova; G. B. Ragimkhanov; D. V. Tereshonok; A. A. Trenkin

doi:10.1209/0295-5075/130/65002

All issues

Volume 130 / No 6 (June 2020)

EPL, 130 6 (2020) 65002

Abstract

Issue		EPL Volume 130, Number 6, June 2020


Article Number		65002
Number of page(s)		7
Section		Physics of Gases, Plasmas and Electric Discharges
DOI		https://doi.org/10.1209/0295-5075/130/65002
Published online		21 July 2020

EPL, 130 (2020) 65002

Features of the cathode plasma formation at the initial stage of a nanosecond spark discharge in air

K. I. Almazova¹, A. N. Belonogov¹, V. V. Borovkov¹, V. S. Kurbanismailov², Z. R. Khalikova², G. B. Ragimkhanov²^(a), D. V. Tereshonok³ and A. A. Trenkin¹

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

^(a) gb-r@gmail.com

Received: 26 March 2020
Accepted: 18 June 2020

Abstract

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 $10^{19}\text{--}10^{20}\ \text{cm}^{-3}$ 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 $35\ \mu \text{m}$ . 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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