Investigation of plasma properties in the phase of the radial expansion of a spark channel in the ‘pin-to-plate’ geometry

Almazova, K. I.; Belonogov, A. N.; Borovkov, V. V.; Khalikova, Z. R.; Ragimkhanov, G. B.; Терешонок, Д. В.; Tren’kin, A. A.

doi:10.1088/1361-6595/aba8cc

Cited by 12 publications

(10 citation statements)

References 40 publications

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“…For comparison, the electron-neutral thermalization time, τ E en , remains above 200 ns and becomes much longer than τ E ei after t = 13.5 ns, as shown in figure 8. The thermalization by electron-ion collisions has already been discussed in the literature [40,49] and the critical electron number density was found to be around n e = 10 16 -10 17 cm −3 [50,51], which is consistent with the present simulations.…”

Section: Gas Temperature Increasesupporting

confidence: 92%

“…8. The thermalization by electron-ion collisions has already been discussed in the literature [40,49] and the critical electron number density was found to be around ne = 10 16 -10 17 cm -3 [50,51], which is consistent with the present simulations.…”

Section: Gas Temperature Increasesupporting

confidence: 91%

“…These later processes are found to have a minor impact under the present conditions. The three-body recombination rate coefficients of N + have been computed in various studies [36][37][38][39][40][41]. These global rate coefficients do not differentiate recombination into different electronic states of the atoms.…”

Section: Determination Of Ionization and Recombination Ratesmentioning

confidence: 99%

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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: Gas Temperature Increasesupporting

confidence: 92%

Section: Gas Temperature Increasesupporting

confidence: 91%

Section: Determination Of Ionization and Recombination Ratesmentioning

confidence: 99%

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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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“…In LTE sparks, the main mechanism of rapid temperature increase is the elastic collisions between electrons and heavies. Fast thermalization is achieved owing to elastic electron-ion Coulomb collisions [37,46]. Therefore, under our conditions, when LTE plasma is observed near the electrode, hydrodynamic effects are mostly defined by ultrafast thermalization rather than by fast gas heating from chemical reactions.…”

Section: D Kinetic Modellingmentioning

confidence: 97%

Jetting axial flow induced by nanosecond repetitively pulsed discharges in quiescent ambient air

Shcherbanev

Krzymuski

Xiong

et al. 2022

J. Phys. D: Appl. Phys.

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This study investigates the phenomenon of jetting axial ﬂow induced by nanosecond repetitively pulsed discharges (NRPD) in quiescent ambient air in a pin-to-pin electrode conﬁguration. Axial stratiﬁcation of discharge parameters (electron number density, temperature, speciﬁc energy, etc.) inﬂuences the hydrodynamic eﬀects leading to directed gas ﬂow from the cathode towards the anode. The experimental results presented in this paper were obtained using schlieren imaging, optical emission spectroscopy, and electrical measurements of the deposited energy. A jetting axial ﬂow was induced for all considered gap distances (0.5 - 5 mm) and pulse repetition frequencies of ≧ 10 kHz. The direction of the induced ﬂow is deﬁned by the polarity of the applied high-voltage pulses. It was found that the ﬂow does not arise immediately after the initiation of the ﬁrst pulse of the applied burst but is induced after a certain number of pulses. Using temporally and spatially resolved optical emission spectroscopy the electron densities and temperatures were measured in the vicinity of the cathode and anode before and after the generation of the axial ﬂow. A model explaining the generation and maintenance of the axial ﬂow in NRPD and the role of the inhomogeneities of plasma parameters along the plasma channel on hydrodynamic eﬀects is suggested and discussed.

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“…When the voltage pulse duration was increased up to ≥10 ns, microchannels with an increased electron number density were evident near a cathode with a small radius of curvature on the background of a diffuse discharge, and microcraters were found on a flat anode after spark discharge and at the point of contact of the spots with the electrode surface [10][11][12][13]. It was shown in [11][12][13] that a large number of microdamages with a diameter from 1 to 20 μm are formed on flat metal anodes. The microdamage number and size were determined by the voltage pulse parameters and the discharge gap length.…”

Section: Introductionmentioning

confidence: 99%

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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Investigation of plasma properties in the phase of the radial expansion of a spark channel in the ‘pin-to-plate’ geometry

Cited by 12 publications

References 40 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

Jetting axial flow induced by nanosecond repetitively pulsed discharges in quiescent ambient air

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

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