The dynamics of ionization waves formation in a transverse nanosecond plasma-beam discharge with a slotted cathode in argon

Ашурбеков, Н. А.; Iminov, K. O.; Zakaryaeva, M. Z.; Ramazanov, A. K.; Shakhsinov, G. Sh.

doi:10.1088/1742-6596/1393/1/012001

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…In numerical modelling, the grid step varies within (1-9)×10 -3 cm, while the time step is taken to be equal to 10 -12 s [19]. The iterative process used for refining the values of the calculated parameters stops when the specified accuracy is achieved.…”

Section: Numerical Model For the Dynamics Of Ionisation Processmentioning

confidence: 99%

The dynamics of a nanosecond gas discharge development with an extended slot cathode in argon

Ашурбеков¹,

Iminov²,

Shakhsinov³

et al. 2020

Plasma Sci. Technol.

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The article presents the results of an experimental study and numerical modelling for the formation and development dynamics of a high-voltage transverse nanosecond discharge generated by a slot cathode in an argon medium at a pressure range of 1-10 Torr. Numerical modelling was carried out under similar experimental conditions for the processes of formation and propagation of ionisation waves, electron density distribution, excited atom and average electron energy in the discharge gap, including the cavity inside the cathode. At a pressure of p=1 Torr, a classical version of a high-voltage discharge is demonstrated to take place with no penetration of the plasma into the cathode cavity and no observed hollow cathode effect. An increase in gas pressure to 5 Torr leads to a penetration of plasma into the cathode cavity with the formation of a cathodic potential drop (CPD) region. Electrons emitted from the side surfaces of the cavity pass through the CPD region without collisions, oscillate inside the cathode cavity; the hollow cathode effect is fully manifested. At р=10 Torr, the modelling results qualitatively coincide with the results at р=5 Torr; in this case, however, hardly any accelerated electrons are observed in the gap between the electrodes, due to their energetic relaxation both inside the cathode cavity and when exiting from it. In both cases, the plasma structure formed at the exit of the cathode cavity involves a concentration of charged particles an order of magnitude higher than that in the rest of the gap, leading to a self-limiting discharge current effect. The results of the numerical modelling are in good agreement with experimental data.

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Section: Numerical Model For the Dynamics Of Ionisation Processmentioning

confidence: 99%

The dynamics of a nanosecond gas discharge development with an extended slot cathode in argon

Ашурбеков¹,

Iminov²,

Shakhsinov³

et al. 2020

Plasma Sci. Technol.

Self Cite

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Numerical simulation of a partially anisotropic electron distribution function in a pulsed discharge with a hollow cathode

et al. 2022

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In this paper, we propose a convenient method for calculating the electron energy distribution function (EEDF) in a gas-discharge plasma, where the presence of high-energy electrons results in the formation of a partial EEDF anisotropy. A detailed description of this method is provided. The performance of the proposed method is demonstrated to calculate the EEDF of plasma column of a high-voltage nanosecond discharge in argon with an extended hollow cathode. The applicability assessment of the proposed method calculating the EEDF in the plasma column of pulsed discharge sustained by the 50 Hz pulse and gas pressure from 5 to 40 Torr is given. It was shown that high-energy electrons were effectively formed in this type of discharge with an increase in the EEDF in the high-energy region. This technique can also be usefully employed for other types of discharges where fast electrons are formed.

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The dynamics of the spatiotemporal distribution of excited atoms in a nanosecond discharge with a slot cathode

Ашурбеков

Iminov

Shakhsinov

et al. 2020

J. Phys.: Conf. Ser.

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The work is devoted to the study of the spatiotemporal dynamics of the production of excited atoms in an extended nanosecond discharge with a slot cathode in neon at medium gas pressures. The authors experimentally investigated the frame-by-frame dynamics of the spatiotemporal formation of the discharge optical irradiation with an exposure time of 5 ns and time intervals between frames of 2 ns. Under similar conditions, the concentration of excited neon atoms at metastable levels with a time resolution of about 10 ns was measured by laser absorption spectroscopy, and the current-voltage characteristics of the discharge were experimentally determined in a wide range of amplitudes of voltage pulses and gas pressures in the range of 1–60 Torr. To analyze the kinetic processes in the plasma source under study, numerical simulation of ionization processes in the Comsol Multiphysics software environment was performed using a special Plasma module.

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The dynamics of ionization waves formation in a transverse nanosecond plasma-beam discharge with a slotted cathode in argon

Cited by 3 publications

References 9 publications

The dynamics of a nanosecond gas discharge development with an extended slot cathode in argon

The dynamics of a nanosecond gas discharge development with an extended slot cathode in argon

Numerical simulation of a partially anisotropic electron distribution function in a pulsed discharge with a hollow cathode

The dynamics of the spatiotemporal distribution of excited atoms in a nanosecond discharge with a slot cathode

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