On the role of high-energy electrons in the formation of a plasma-beam discharge structure in a diode with a slit cathode

Ашурбеков, Н. А.; Iminov, K. O.; Kobzeva, V. S.; Kobzev, O. V.

doi:10.1134/s1063785007060211

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…The solution was found by applying method of finite differences. In particular, the third equation was solved with the help of Libman's method of iteration [10][11][12]. In the numerical simulation, the maximum electron density was determined from the conductivity of the discharge, estimated from the current-voltage characteristics.…”

Section: Resultsmentioning

confidence: 99%

“…One of the methods for large plasma generation employs gas ionization by high-energy ribbon electron beams. Thus, experimental studies of transverse nanosecond discharges with a lengthy slotted hollow cathode that generate high-energy (1-10 kV) ribbon electron beams are of scientific interest and merit [11,12]. These works were the first detailed studies of the mechanisms of formation of high-energy electrons in a gaseous medium in the process of electrical breakdown.…”

Section: Introductionmentioning

confidence: 99%

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

Ашурбеков¹,

Iminov²,

Popov³

2017

Plasma Sci. Technol.

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A high-voltage transverse pulsed nanosecond discharge with a slotted hollow cathode was found to be a source of high-energy (few kV) ribbon electron beams. Conditions for the formation and extinction of electron beams were experimentally studied in discharges in helium at pressures of 1-100 Torr. It was found that interaction of fast electrons with a non-uniform electric field near the slotted cathode led to limitation of the magnitude of the discharge current. A physical model was developed to describe the discharge current self-limitation that was in satisfactory agreement with the experimental results. Some technical solutions that are expected to increase the upper current limits in transverse nanosecond discharge are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Ашурбеков¹,

Iminov²,

Popov³

2017

Plasma Sci. Technol.

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“…Let us estimate the CPF region size for the discharge conditions under study. Using the ratio d k p ≈ 7.5 • 10 −2 cm • Torr [12], we get d k ≈ 1.5 • 10 −2 cmlength of the CPF region.…”

mentioning

confidence: 86%

“…It is known that one of the distinctive features of the hollow-cathode discharge is a sharp decrease of the cathode potential fall (CPF) region as compared to the case of an ordinary anomalous glow discharge. Its dimensions are such that the electrons emitted by the cathode pass through the CPF region almost without collisions and acquire energy ε = eU k , where U kpotential of the cathode layer [1,11,12]. Let us estimate the CPF region size for the discharge conditions under study.…”

mentioning

confidence: 99%

Electron energy distribution function in a high-voltage pulsed discharge with an extended hollow cathode

Ашурбеков

Zakaryaeva

K.O.

et al. 2022

Technical Physics Letters

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The dynamics of a nanosecond discharge with an extended hollow cathode in argon is studied and the electron energy distribution function (EEDF) in a plasma column is calculated. The issues of the formation of the EEDF in the discharge column and inside the cathode cavity are considered. The conditions of the validity the two-term approximation of the EEDF in the plasma column are analyzed and the appropriate evaluations are given. Keywords: hollow cathode, pulse discharge, argon, electron energy distribution function.

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“…For the formation of such ion flux sources, extended ribbon electron beams are required, particularly in terms of a high-voltage transverse nanosecond discharge generated by an extended slot cathode. In such a gas-discharge system, a ribbon electron beam is generated as a result of the emission of electrons from a cold cathode under the influence of bombardment by highenergy ions and atoms, as well as their acceleration in the region of the cathode potential drop (CPD) [12,13]. By using ribbon electron beams behind the mesh anode in the region beside the collector, it has been shown that a beam plasma is created in the form of a thin 'plasma sheet' acting as the emitting surface of a wide-aperture beam formed by accelerated ions [11].…”

Section: Introductionmentioning

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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On the role of high-energy electrons in the formation of a plasma-beam discharge structure in a diode with a slit cathode

Cited by 9 publications

References 6 publications

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

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

Electron energy distribution function in a high-voltage pulsed discharge with an extended hollow cathode

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

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