Mechanisms responsible for the initiation of a fast breakdown in an atmospheric discharge

Parkevich, E. V.; Ivanenkov, G. V.; Medvedev, Mikhail; Khirianova, A. I.; Selyukov, A. S.; Агафонов, А. В.; Mingaleev, A. R.; Shelkovenko, T. A.; Pikuz, S. A.

doi:10.1088/1361-6595/aaebdb

Cited by 37 publications

(40 citation statements)

References 21 publications

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“…It should be noted that in a number of works [33,34], it is assumed that the discharge constriction is the result of magnetic compression of plasma channel. The magnetic pressure P m is a function of the discharge current I and of the filament radius R f :…”

Section: Synchronized Electron Temperature and Electron Density Measumentioning

confidence: 99%

“…In [33] the initial stage of nanosecond discharge at atmospheric pressure was studied with extra-high spatial (3-4 µm) and temporal (70 ps) resolution. The authors demonstrated, that nanosecond breakdown initiated by 4 ns rise time 25 kV amplitude voltage pulse in 3 mm pin-to-plane gap starts from a dense spot of electrons near the cathode, with a density n 0 e > 10 20 cm −3 and a typical size of ∼ 10 µm.…”

Section: Near-electrode Processes and Filament Propagation As An Ionimentioning

confidence: 99%

“…The authors demonstrated, that nanosecond breakdown initiated by 4 ns rise time 25 kV amplitude voltage pulse in 3 mm pin-to-plane gap starts from a dense spot of electrons near the cathode, with a density n 0 e > 10 20 cm −3 and a typical size of ∼ 10 µm. The authors [33] remark that the nature of the observed electron cloud is still under discussion and mention the field emission in strong electric field and a possibility of production of a supercritical fluid during explosive heating of a single spike or multiple spikes on the cathode. Non-numerous experimental observations [11,13,14,37] obtained in mm or sub-mm pin-to-pin gaps report the start of the filament from the cathode, then, with a delay of the order of 1 ns -from the anode, and then the filaments merge in the middle of the gap [13,37].…”

Section: Near-electrode Processes and Filament Propagation As An Ionimentioning

confidence: 99%

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Filamentary nanosecond surface dielectric barrier discharge. Plasma properties in the filaments

Shcherbanev

Ding

Starikovskaia

et al. 2019

Plasma Sources Sci. Technol.

100

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Streamer-to-filament transition is a general feature of nanosecond discharges at elevated pressure. The transition is observed in different discharges by different groups: in the nanosecond surface dielectric barrier discharges (nSDBDs) in a single shot regime at high pressure (2-15 bar), in the point-to-point or point-to-plane open electrodes discharges at high repetitive frequency (so-called nanosecond repetitive pulsed discharges, NRPDs) at atmospherics pressure. The present paper contains experimental analysis of plasma properties in the filamentary nSDBD: the electrical current, the specific deposited energy, the electron density and the electron temperature were measured for a wide range of pressures and voltages. A model explaining plasma properties in filamentary nanosecond discharges and the role of excited species in streamer-to-filament transition is suggested and discussed.

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Section: Synchronized Electron Temperature and Electron Density Measumentioning

confidence: 99%

Section: Near-electrode Processes and Filament Propagation As An Ionimentioning

confidence: 99%

Section: Near-electrode Processes and Filament Propagation As An Ionimentioning

confidence: 99%

See 1 more Smart Citation

Filamentary nanosecond surface dielectric barrier discharge. Plasma properties in the filaments

Shcherbanev

Ding

Starikovskaia

et al. 2019

Plasma Sources Sci. Technol.

100

View full text Add to dashboard Cite

show abstract

“…Microchannels in the plasma of pulsed discharges in atmospheric air in tip-plane gaps of a few millimeters long was also found in [14][15][16] for both voltage pulse polarities. Therewith, jets with a high concentration of ionized particles were detected near the electrodes in the case of spark breakdown.…”

Section: Introductionmentioning

confidence: 70%

Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Тарасенко¹,

Белоплотов²,

Панченко³

et al. 2023

Preprint

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Features of nanosecond discharge development in a non-uniform electric field are studied experimentally. High spatial resolution imaging showed that thin luminous tracks of great length with a cross-section of a few microns are observed against the background of discharge glow in air and argon. It has been established that the detected tracks are adjacent to brightly luminous white spots on the electrodes or to the vicinity of these spots, and are associated with the flight of small particles. It is shown that the traces have various shapes and change from pulse to pulse. The particle tracks may look like curvy or straight lines. In some photos, they can change the direction of movement to the opposite. The particle trace was found to abruptly cut off and a bright flash is visible at the trail break point. The color of the tracks differs from that of the spark leaders, while the bands of the second positive nitrogen system dominate in the gap spectra during the existence of a diffuse discharge. Areas of blue light are evident near the electrodes, as well. Development of glow in the gap during its breakdown is revealed using an ICCD camera. Physical reasons for the observed phenomena are discussed.

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“…Finally, apart from the EWE, the problem of the droplet origination is also related with the origination of plasma spots at electrodes during gas and vacuum discharges. For instance, when probing the near-electrode plasma formed after the breakdown in small air gaps, some plasma areas turn out to be opaque to 0.532 µm radiation [34][35][36]. Combined with the analytical considerations, the experimental facts point to the existence of dense near-electrode plasma jets generated in electrode local regions due to multiple explosions.…”

Section: Discussionmentioning

confidence: 99%

Laser scattering by submicron droplets originated during the electrical explosion of thin metal wires

Romanova,

Ivanenkov,

Parkevich

et al. 2020

Preprint

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This paper presents the results of studying of dispersed media formation during the electrical explosion of thin metal wires in vacuum by using low-current generators (∼ 1-10 kA). Particular attention is paid to the analysis of the composition and structure of the corresponding explosion products as well as to the problem of their visualization using simultaneous laser interferometry and shadow imaging at two wavelengths (1.064 µm and 0.532 µm). Our findings point to the fact that the important role in the visualization of the explosion products belongs to multiple scattering by submicron droplets of dense condensed matter, which are mixed with metal vapor. The hypothesis on the existence of submicron droplets in the products of exploding metal wires correlates with the results obtained by soft x-ray radiography combined with a laser probing technique. Taking into account the multiple scattering by submicron droplets, it is possible to significantly clarify the parameters of the explosion products visualized via laser probing techniques as well as to gain a deeper insight into the physics behind the electrical wire explosion.

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Mechanisms responsible for the initiation of a fast breakdown in an atmospheric discharge

Cited by 37 publications

References 21 publications

Filamentary nanosecond surface dielectric barrier discharge. Plasma properties in the filaments

Filamentary nanosecond surface dielectric barrier discharge. Plasma properties in the filaments

Thin Luminous Tracks of Particles from Electrodes with a Small Radius of Curvature in Pulsed Nanosecond Discharges in Air and Argon

Laser scattering by submicron droplets originated during the electrical explosion of thin metal wires

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