Computational analysis of the electron beam source with hollow anode

Levko, Dmitry

doi:10.1063/1.5056252

Physics of Plasmas

2019

DOI: 10.1063/1.5056252

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Computational analysis of the electron beam source with hollow anode

Dmitry Levko

Abstract: The computational analysis of the plasma source with the hollow anode is performed using the two-dimensional Particle-in-Cell Monte Carlo collisions model. This source operates in two molecular gases (CO2 and N2) in the abnormal glow mode, i.e., it is supported by the secondary electron emission from the cathode. It is obtained that this plasma source can be used for the generation of high-energy electrons (energy > 100 eV) only if the cathode potential exceeds 500 V. Otherwise, the high-energy electron… Show more

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Cited by 2 publications

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Isentropic plasma sheath model for improved fidelity

2022

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A model is developed for a collisionless plasma sheath assuming isentropic electrons in contrast to the standard isothermal electron assumption. This approach is enabled by the approximation of a Maxwellian electron velocity distribution function across the sheath, which is justified by near wall measurements. The conservation of entropy leads to a modified Boltzmann relation and a modified Bohm criterion. The predicted floating sheath potential is in excellent agreement with experimental data. Takamura's model for a space-charge limited plasma sheath near an emissive surface is also modified for isentropic electrons and with that modification agrees well with numerical results from a full fluid plasma model.

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Isentropic plasma sheath model for improved fidelity

2022

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Computational study of microdischarges driven by electron beam injection with particle-in-cell/Monte Carlo collision simulations

Wang

Zhou

et al. 2022

Journal of Applied Physics

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Microdischarges (MDs) have attracted increasing attention recently due to their widespread applications. The electron beam injection as an external source can affect the formation and characteristics of microdischarges. Aimed at exploring the kinetic properties of the atmospheric-pressure microdischarges purely driven by electron beam injection without external voltage, the one-dimensional implicit particle-in-cell/Monte Carlo collision model is developed. The monoenergetic electron beam is injected from the left electrode with a current of 0.001–0.05 A and an emission energy of 20–80 eV. It is found that similar to voltage and current-driven MDs, electron beam driven MDs can sustain steady glow discharge with high density ([Formula: see text]–[Formula: see text]) but has much lower plasma potential ([Formula: see text] V) and electron temperature (<1 eV) due to the absence of an external field. The electron energy distribution function is composed of a low-energy group with two-temperature distribution and a high-energy group with a discrete distribution. In addition, the injected electron beam current and energy can influence the plasma properties significantly, such as plasma density, electron temperature, plasma potential, etc. The characteristics of ion bombardment can also be modulated by the beam energy and current, resulting in achievement of low energy and high flux. By enlarging the gap between the electrodes, the parameter difference on both sides can be realized.

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Computational analysis of the electron beam source with hollow anode

Cited by 2 publications

References 13 publications

Isentropic plasma sheath model for improved fidelity

Isentropic plasma sheath model for improved fidelity

Computational study of microdischarges driven by electron beam injection with particle-in-cell/Monte Carlo collision simulations

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