Simulation of Electron-Beam Generating Plasma at Atmospheric Pressure

Liang, Ouyang; Li, Hong; Li, Benben; Zhou, Jian; Hong, Yan; Tie, Su; Wang, Huihui; Liu, Wandong

doi:10.1088/1009-0630/9/2/11

Plasma Sci. Technol.

2007

DOI: 10.1088/1009-0630/9/2/11

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Simulation of Electron-Beam Generating Plasma at Atmospheric Pressure

Ouyang Liang

Hong Li

Benben Li

et al.

Abstract: Simulation of Electron-Beam Generating Plasma at Atmospheric Pressure * OUYANG Liang( ), LI Hong(Ó ), LI Benben (Ó ), ZHOU Junqing( ç), YAN Hong( ), SU Tie( ), WANG Huihui( ), LIUWandong( ü)

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Cited by 5 publications

References 13 publications

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Two-dimensional numerical simulation of a continuous needle-like argon electron-beam plasma

Chen

Liu

2017

Physics of Plasmas

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The fluid-Poisson equations coupled with the Monte Carlo method were used to simulate the spatio-temporal behavior of a needle-like argon electron-beam plasma. Based on the Monte Carlo simulation, three coupled parameters characterizing the electron beam propagation for initial energies above several keV were expressed using a universal dimensionless shape function given in terms of the beam range multiplied by a normalized coefficient. Therefore, a single run of the Monte Carlo code was sufficient for the simulations over a wide range of conditions. The spatial potential as a function of space and time was studied from the fluid-Poisson equations. The results indicate that the time evolution of the spatial potential was influenced by the presence of the slowed-down electrons and the flying beam electrons, whereas the potential in quasi-equilibrium was mainly determined from the spatial distribution of the secondary electron. The potential in quasi-equilibrium was positive near the beam entrance and most negative along the tip of the beam range, which was a result of ambipolar diffusion. When the enclosing boundary surfaces were moved within the beam range, the potential was nearly positive everywhere. The calculation on the diffusion-drift flux indicated that the net current of the secondary electrons flowing back to the incident plane in quasi-equilibrium balanced the incident beam current, which was the so-called return current in the three-dimensional space.

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Two-dimensional numerical simulation of a continuous needle-like argon electron-beam plasma

Chen

Liu

2017

Physics of Plasmas

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Two-dimensional modeling image of space charge migration in a needle-like electron beam plasma

Chen

Liu

et al. 2019

Physics of Plasmas

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Charge neutralization in a continuous electron beam plasma (EBP) in a half-open space at intermediate and high pressures is an important physical issue. A two-dimensional numerical simulation was performed to illustrate the spatial and temporary evolution of the needle-like EBP from the beginning of electron beam injection to the quasi-steady state. The temporary evolution of the space charge separates into three phases and the involved respective physical processes controlling different phases were identified. The first phase lasts for less than 1 ns, where the space charge comprising the beam electrons is mainly near the exiting entrance. In the second phase, a significant ring-shaped distribution of space charge appears because of broad differences in the energy and charge distributions. Moreover, the space potential first increases and then decreases, a result of competition between the charge accumulation by the injection of beam electrons and the charge migration of plasma electrons. The second phase lasts from 1 ns to about 3 μs. In the third phase, the EBP reaches quasi-equilibrium, where the spatial potential is a result of ambipolar diffusion and is therefore only correlated with the distribution of plasma electrons. As a result, the spatial and temporary evolution of the continuous EBP is governed by energy and charge deposition, whereas the parameter values in the quasi-steady state are mainly determined by the energy deposition.

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Numerical and Experimental Investigation of Electron Beam Air Plasma Properties at Moderate Pressure

Deng¹,

Tan²,

Han³

2014

Plasma Sci. Technol.

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Large size of air plasma at near atmospheric pressure has specific effects in aerospace applications. In this paper, a two dimensional multi-fluid model coupled with Monte Carlo (MC) model is established, and some experiments were carried out to investigate the characteristics of electron beam air plasma at pressure of 100-170 Torr. Based on the model, the properties of electron beam air plasma are acquired. The electron density is of the order of 10 16 m −3 and the longitudinal size can exceed 1.2 m. The profiles of charged particles demonstrate that the oxygen molecule is very important for air plasma and its elementary processes play a key role in plasma equilibrium processes. The potential is almost negative and a very low potential belt is observed at the edge of plasma acting as a protection shell. A series of experiments were carried out in a low pressure vacuum facility and the beam plasma densities were diagnosed. The experimental results demonstrate that electron density increased with the electron beam energy, and the relatively low pressure was favorable for gaining high density plasma. Hence in order to achieve high density and large size plasma, it requires the researchers to choose proper discharge parameters.

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Simulation of Electron-Beam Generating Plasma at Atmospheric Pressure

Abstract: Simulation of Electron-Beam Generating Plasma at Atmospheric Pressure * OUYANG Liang( ), LI Hong(Ó ), LI Benben (Ó ), ZHOU Junqing( ç), YAN Hong( ), SU Tie( ), WANG Huihui( ), LIUWandong( ü)

Cited by 5 publications

References 13 publications

Two-dimensional numerical simulation of a continuous needle-like argon electron-beam plasma

Two-dimensional numerical simulation of a continuous needle-like argon electron-beam plasma

Two-dimensional modeling image of space charge migration in a needle-like electron beam plasma

Numerical and Experimental Investigation of Electron Beam Air Plasma Properties at Moderate Pressure

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