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

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 initi...

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Bibliographic Details
Published inEurophysics letters Vol. 130; no. 6; pp. 65002 - 65008
Main Authors Almazova, K. I., Belonogov, A. N., Borovkov, V. V., Kurbanismailov, V. S., Khalikova, Z. R., Ragimkhanov, G. B., Tereshonok, D. V., Trenkin, A. A.
Format Journal Article
LanguageEnglish
Published Les Ulis EDP Sciences, IOP Publishing and Società Italiana di Fisica 01.06.2020
IOP Publishing
Subjects
Breakdown
Cathodes
Electric sparks
Electrodes
Gas dynamics
Mach-Zehnder interferometers
Microchannels
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Summary: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.
ISSN:0295-5075
1286-4854
1286-4854
DOI:10.1209/0295-5075/130/65002