Physical Kinetics of Electrons in a High-Voltage Pulsed High-Pressure Discharge with Cylindrical Geometry

Kozhevnikov, V. Yu.; Kozyrev, A. V.; Semeniuk, Natalia

doi:10.1007/s11182-017-1232-2

Cited by 19 publications

(18 citation statements)

References 16 publications

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“…Here, n g is the number density of the gas atoms and σ * (v) is the momentum transfer cross-section of the electron-atom collisions. Previously, in [13], we showed that equation (5) well describes the isotropization of the electron velocity distribution function with appropriately chosen σ * (v). Without taking this process into account, the simulation did not allow us to obtain the correct value of the electron current in the discharge.…”

Section: Description Of Collision Processesmentioning

confidence: 96%

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Kinetic theory of high-voltage low-pressure gas discharge with electron initiation on a cathode in a planar gap

Kozyrev¹,

Kozhevnikov²,

Semeniuk³

2020

Plasma Sources Sci. Technol.

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We report one-dimensional kinetic simulation of electron and ion transport and multiplication (based on the Boltzmann kinetic equations) in a self-consistent electric field after electron injection from the cathode. The 1D1V Boltzmann equations take into account the electron impact ionization, elastic electron scattering, and resonant ion recharging. The spatio-temporal evolution of the gas breakdown in a planar diode with a gap of 5 mm filled with nitrogen at pressure of 1 Pa, with applied voltage of 2.5 kV, was demonstrated in detail. In the vicinity of these parameters, an intermediate gap breakdown mode is realized when the discharge exists in the form of relaxation current oscillations. The simulation showed that, during plasma generation, the electric potential acquires non-monotonic spatial distribution in the gap. Under the non-monotonic potential distribution, anode-directed ion flow is formed inside the gap. An extended hump of potential may appear, forming ion fluxes with kinetic energy nominally exceeding the voltage drop (in the calculated spectrum the mean ion energy was at the level of 6–7 keV at an applied voltage of 2.5 kV).

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Section: Description Of Collision Processesmentioning

confidence: 96%

“…However, this approach allows us to write algebraic expressions for the collision terms in the right-hand side of equation (2). The description of the elementary processes with electrons presented here was successfully tested in [13].…”

Section: Description Of Collision Processesmentioning

confidence: 99%

Kinetic theory of high-voltage low-pressure gas discharge with electron initiation on a cathode in a planar gap

Kozyrev¹,

Kozhevnikov²,

Semeniuk³

2020

Plasma Sources Sci. Technol.

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“…The voltage amplitude at the cathode during RAEs' emission in gas can be estimated from oscillograms as U c (t) ≈ 2K•U ref (t), because the cathode operates in an idle mode before the appearance of fast electrons. When RAEs pass through the MICD gap, an ionization trace appears [38,[60][61][62][63] and then the discharge current arises. As a result, we observe an inverted section of U ref (t) and, during the polarity reversal, the voltage across the MICD gap decreases rapidly [64].…”

Section: General Remarksmentioning

confidence: 99%

Emission Features and Structure of an Electron Beam versus Gas Pressure and Magnetic Field in a Cold-Cathode Coaxial Diode

et al. 2022

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The structure of the emission surface of a cold tubular cathode and electron beam was investigated as a function of the magnetic field in the coaxial diode of the high-current accelerator. The runaway mode of magnetized electrons in atmospheric air enabled registering the instantaneous structure of activated field-emission centers at the cathode edge. The region of air pressure (about 3 Torr) was determined experimentally and via analysis, where the explosive emission mechanism of the appearance of fast electrons with energies above 100 keV is replaced by the runaway electrons in a gas.

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“…As the basis for constructing the theory of gas breakdown by subnanosecond voltage pulses in a coaxial gap, we choose the kinetic model of electron transport. This approach was previously proposed and developed by us in papers [52,53].…”

Section: Theoretical Model Of a Discharge With Raes And Electron Emis...mentioning

confidence: 99%

“…where e is the elementary charge, m is the electron rest mass, t is the time variable, p = mvγ is the relativistic momentum (v is the radial velocity), γ is the relativistic factor, c is the speed of light, f (r,p,t) is the EDF (in s m −4 kg −1 units), E(r,t) is the electric field strength, and r is the radial coordinate. The details of the mathematical description, including functional features of terms on the right-hand side of the equation ( 1), are explained and discussed in [52]. Here we briefly list the approximations and elementary processes that are taken into account in this theoretical model.…”

Section: Description Of the Discharge Electron Kineticsmentioning

confidence: 99%

Mechanism and dynamics of picosecond radial breakdown of a gas-filled coaxial line

Зубарев¹,

Kozhevnikov²,

Kozyrev³

et al. 2020

Plasma Sources Sci. Technol.

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High-voltage picosecond breakdown of an atmospheric-pressure air-filled coaxial line in the radial electric field of a propagating transverse electromagnetic wave has been studied both experimentally and theoretically. On the one hand, we demonstrate that gas preionization by runaway electrons (RAEs) plays a decisive role in the breakdown development process: the breakdown delay time drastically increases in the absence of RAEs. On the other hand, it is established that, for sufficiently short pulses, the radial gap switching process does not have enough time to develop even in a situation where the RAE flow is effectively generated. Fundamental limitations on the breakdown strength of gas coaxial feeders imposed by this effect are discussed.

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Physical Kinetics of Electrons in a High-Voltage Pulsed High-Pressure Discharge with Cylindrical Geometry

Cited by 19 publications

References 16 publications

Kinetic theory of high-voltage low-pressure gas discharge with electron initiation on a cathode in a planar gap

Kinetic theory of high-voltage low-pressure gas discharge with electron initiation on a cathode in a planar gap

Emission Features and Structure of an Electron Beam versus Gas Pressure and Magnetic Field in a Cold-Cathode Coaxial Diode

Mechanism and dynamics of picosecond radial breakdown of a gas-filled coaxial line

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