Formation of ball streamers at a subnanosecond breakdown of gases at a high pressure in a nonuniform electric field

The formation of a diffuse discharge plasma at a subnanosecond breakdown of a “cone–plane” gap filled with air, nitrogen, methane, hydrogen, argon, neon, and helium at various pressures has been studied. Nanosecond negative and positive voltage pulses have been applied to the conical electrode. The...

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Bibliographic Details
Published in:JETP letters 2017-11, Vol.106 (10), p.653-658
Main Authors: Beloplotov, D. V., Tarasenko, V. F., Sorokin, D. A., Lomaev, M. I.
Format: Article
Language:English
Subjects:
Atomic
Biological and Medical Physics
Biophysics
Breakdown
Electrodes
Electron avalanche
Electron beams
Foils
Helium
Hydro- and Gas Dynamics
Molecular
Neon
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Plasma
Quantum Information Technology
Solid State Physics
Spintronics
Streak cameras
Streamer formation
Voltage pulses
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Summary:The formation of a diffuse discharge plasma at a subnanosecond breakdown of a “cone–plane” gap filled with air, nitrogen, methane, hydrogen, argon, neon, and helium at various pressures has been studied. Nanosecond negative and positive voltage pulses have been applied to the conical electrode. The experimental data on the dynamics of plasma glow at the stage of formation and propagation of a streamer have been obtained with intensified charge-coupled device and streak cameras. It has been found that the formation of ball streamers is observed in all gases and at both polarities. A supershort avalanche electron beam has been detected behind the flat foil electrode in a wide range of pressures in the case of a negatively charged conical electrode. A mechanism of the formation of streamers at breakdown of various gases at high overvoltages has been discussed.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364017220064