Current self-limitation in a transverse nanosecond discharge with a slotted cathode

Ашурбеков, Н. А.; Iminov, K. O.; Popov, O. E.

doi:10.1088/2058-6272/19/3/035401

Cited by 11 publications

(5 citation statements)

References 16 publications

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“…Further, accelerated electrons result in overlapping areas of negative glow at the side surfaces of the cathode slot and the hollow cathode effect is manifested. The generation of accelerated electrons in the cathode cavity is confirmed by the numerical modelling results (figure 12 The development of ionisation processes in the discharge also leads to the formation of a plasma structure at the exit of the cathode cavity with a maximum concentration of charged particles (figure 11(d)), promoting the self-limiting discharge current effect as discovered and studied in [23].…”

Section: Calculation Results At Gas Pressure Of 5 Torrsupporting

confidence: 53%

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: Calculation Results At Gas Pressure Of 5 Torrsupporting

confidence: 53%

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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“…As compared to a conventional anomalous glow discharge, hollow cathode discharge is distinguished by a sharp decrease in the CPD area. Its dimensions such that the electrons emitted by the cathode pass the CPD area virtually without collisions to acquire an energy of e = eU , k where U k is the potential of the cathode layer [8,9,24].…”

Section: Resultsmentioning

confidence: 99%

“…Let us estimate the size of the CPD area for the conditions of the discharge under consideration. Using the expression [24] ´»…”

Section: Resultsmentioning

confidence: 99%

Simulation of the spatio-temporal evolution of the electron energy distribution function in a pulsed hollow-cathode discharge

Rabadanov¹,

Ашурбеков²,

Iminov³

et al. 2023

Plasma Sci. Technol.

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This article presents the 2D simulation results of a nanosecond pulsed hollow cathode discharge obtained through the combination of fluid and kinetic models. The spatio-temporal evolution of the electron energy distribution function (EEDF) of the plasma column and electrical characteristics of the nanosecond pulsed hollow cathode discharge at a gas pressure of 5 Torr are studied. The results show that the discharge development starts with the formation of an ionization front at the anode surface. The ionization front splits into two parts in the cathode cavity while propagating along its lateral surfaces. The ionization front formation leads to an increase in the fast isotropic EEDF component at its front, as well as in the anisotropic EEDF component. The accelerated electrons enter the cathode cavity, which significantly contribute to the formation of the high-energy EEDF component and EEDF anisotropy.

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“…Генерация убегающих электронов с высокой энергией при импульсных разрядах в газах повышенного давления является важным физическим явлением, которое продолжает изучаться в настоящее время. Возможность получения убегающих электронов или(и) тормозного рентгеновского излучения в газах повышенного давления следует из теоретических работ, а их наличие зарегистрировано в лабораторных и атмосферных разрядах, см., например, [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. В воздухе атмосферного давления пучки убегающих электронов за тонкой анодной фольгой фиксировались шунтом или коллектором в четырех научных группах [7,9,10,14].…”

Section: Introductionunclassified

“…Предлагаются различные механизмы генерации убегающих электронов. Например, за счет " пространственного заряда ионов" [22], " эффекта поляризационного самоускорения электронов" [23], нагрева газа в микроканалах, который " обеспечивает рост отношения напряженности электрического поля к концентрации газа в микроканалах до значений, достаточных для генерации в них пучков высокоэнергетичных электронов и тормозного рентгеновского излучения" [24], и другие [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionunclassified

Формирование Двух Импульсов Тока Пучка Убегающих Электронов

Белоплотов¹,

Тарасенко²,

Sorokin³

et al. 2021

Журнал Технической Физики

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The conditions for the formation of two current pulses of runaway electron beams during the breakdown of a point-to-plane and tube-to-plane gaps in high-pressure air, nitrogen, and helium are studied. It has been shown experimentally that, depending on a pressure and kind of gas, a rise time of voltage pulse with an amplitude of tens of kilovolts, three modes of generation of runaway electron beams are observed. In the first mode, a single current pulse of runaway electron beam is observed at the maximum voltage across the gap, when a streamer appears in the vicinity of the pointed electrode (cathode). Its duration is ≈100 ps. In the second mode, two current pulses of runaway electron beams are observed at a lower pressure. The first pulse is generated as in the first mode. The second pulse is generated after the gap is bridged by the streamer (the first ionization wave). The electron energy in the second pulse is significantly less than in the first one, but the duration and amplitude of second current pulse under optimal conditions are greater. The third mode is implemented at lower pressures than in the second one. The generation of runaway electrons continues after the first pulse without a pause in the quasi-stationary stage. The total current pulse duration is hundreds of picoseconds.

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Current self-limitation in a transverse nanosecond discharge with a slotted cathode

Cited by 11 publications

References 16 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

Simulation of the spatio-temporal evolution of the electron energy distribution function in a pulsed hollow-cathode discharge

Формирование Двух Импульсов Тока Пучка Убегающих Электронов

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