Investigation of a Near-Electrode Plasma Formed in the Atmospheric Discharge with Employment of Picosecond Laser Probing

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

doi:10.1007/s10946-019-09769-5

Cited by 12 publications

(11 citation statements)

References 12 publications

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“…This mechanism explains, in our opinion, the fast transition (< 1 ns) from a non-equilibrium to a thermal plasma, as experimentally observed with nanosecond discharges in Refs. [7][8][9][10][11][12][13].…”

Section: Discussionmentioning

confidence: 99%

“…This type of nanosecond discharge, called the thermal spark, is in thermal equilibrium [7] and differs from the NRP spark described by Pai et al [2]. Parkevich and co-authors showed by laser interferometry that, at atmospheric conditions, full ionization is reached first close to the electrodes [8,9]. In Ref.…”

Section: Introductionmentioning

confidence: 92%

“…The different states of non-equilibrium NRP plasmas (corona, glow, and spark) have been described by Pai et al [2]. However, other works [7][8][9][10][11][12][13][14] have shown that nanosecond discharges can also produce fully ionized thermal plasmas. This type of nanosecond discharge, called the thermal spark, is in thermal equilibrium [7] and differs from the NRP spark described by Pai et al [2].…”

Section: Introductionmentioning

confidence: 96%

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The role of excited electronic states in ambient air ionization by a nanosecond discharge

Minesi

Mariotto

Pannier

et al. 2021

Plasma Sources Sci. Technol.

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The mechanism of air ionization by a single nanosecond discharge under atmospheric conditions is studied using numerical simulations. The plasma kinetics are solved with ZDPlasKin and the electron energy distribution function is calculated with BOLSIG+. The model includes the excited electronic states of O and N atoms, which are shown to play the main role in plasma ionization for ne > 10 16 cm -3 .For electric fields typical in nanosecond discharges, a non-equilibrium plasma (Te > Tgas) is formed at ambient conditions and remains partially ionized for about 12 nanoseconds (ne < 10 16 cm -3 ). Then, the discharge abruptly reaches full ionization (ne ≈ 10 19 cm -3 ) and thermalization (Te = Tgas ≈ 3 eV) in less than half a nanosecond, as also encountered in experimental studies. This fast ionization process is explained by the electron impact ionization of atomic excited states whereas the fast thermalization is induced by the elastic electron-ion collisions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 96%

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The role of excited electronic states in ambient air ionization by a nanosecond discharge

Minesi

Mariotto

Pannier

et al. 2021

Plasma Sources Sci. Technol.

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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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“…Recently, the study of these discharges at ambient conditions has shown that NRP discharges can also be fully ionized. In [12,13], Parkevitch et al showed by laser interferometry that approximately one nanosecond after a 25-kV voltage rise, a fully-ionized plasma is formed near the cathode surface in a pin-to-plane configuration. Moreover, they observed the formation of "clots" of dense plasma with electron number densities greater than 10 20 cm -3 .…”

Section: Introductionmentioning

confidence: 99%

Role of the excited electronic states in the ionization of ambient air by a nanosecond discharge

Minesi

Mariotto

Stancu

et al. 2020

AIAA Scitech 2020 Forum

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Investigation of a Near-Electrode Plasma Formed in the Atmospheric Discharge with Employment of Picosecond Laser Probing

Cited by 12 publications

References 12 publications

The role of excited electronic states in ambient air ionization by a nanosecond discharge

The role of excited electronic states in ambient air ionization by a nanosecond discharge

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

Role of the excited electronic states in the ionization of ambient air by a nanosecond discharge

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