Full fluid moment model for low temperature magnetized plasmas

Sahu, Rupali; Mansour, Adnan R.; Hara, Kentaro

doi:10.1063/5.0021474

Cited by 39 publications

(51 citation statements)

References 37 publications

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“…The macroscopic behavior of the electrons is obtained from integrating in the particle velocity space the kinetic solution. In spite of the rather different characteristics of the three subpopulations, the whole electron population is found to satisfy the simple paraxial equations (47) n e u �e /B = const, (48)…”

Section: D-axial Kinetic Model Of a Paraxial Plumementioning

confidence: 99%

“…1D-axial (1Dz) fully-fluid models are widely used to understand, in a simplified scenario and at a low computational cost: central phenomena of the HET discharge, the sensitivity to design and operational conditions, and several longitudinal oscillations. Most 1Dz HET models [43][44][45][46][47][48] have considered the discharge only between the Fig. 2 Simulation of an axisymmetric ECRT with the hybrid code HYPHEN based on Ref.…”

Section: D Axial Fluid Modelmentioning

confidence: 99%

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Using electron fluid models to analyze plasma thruster discharges

Ahedo

2023

J Electr Propuls

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Fluid models of the slow-dynamics of magnetized, weakly-collisional electrons lead to build computationally-affordable, long-time simulations of plasma discharges in Hall-effect and electrodeless plasma thrusters. This paper discusses the main assumptions and techniques used in 1D to 3D electron fluid models, and some examples illustrate their capabilities. Critical aspects of these fluid models are the expressions for the pressure tensor, the heat flux vector, the plasma-wall fluxes, and the high-frequency-averaged electron transport and heating caused by plasma waves, generated either by turbulence or external irradiation. The different orders of magnitude of the three scalar momentum equations characterize the electron anisotropic transport. Central points of the discussion are: the role of electron inertia, magnetically-aligned meshes versus Cartesian-type ones, the use of a thermalized potential and the infinite mobility limit, the existence of convective-type heat fluxes, and the modeling of the Debye sheath, and wall fluxes. Plasma plume models present their own peculiarities, related to anomalous parallel cooling and heat flux closures, the matching of finite plume domains with quiescent infinity, and solving fully collisionless expansions. Solutions of two 1D electron kinetic models are used to derive kinetically-consistent fluid models and compare them with more conventional ones.

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Section: D-axial Kinetic Model Of a Paraxial Plumementioning

confidence: 99%

Section: D Axial Fluid Modelmentioning

confidence: 99%

Using electron fluid models to analyze plasma thruster discharges

Ahedo

2023

J Electr Propuls

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“…Sahu et. al. propose to revisit the sheath boundary flux expressions and use an isentropic description of the sheath for improved fidelity [22,23]. However, it is still common to assume the ions thermalized with the neutrals (consequently a collisionless sheath).…”

Section: Introductionmentioning

confidence: 99%

Ion temperature profile importance in collisional sheath modelling

Mun

Muraglia

Agullo

et al. 2022

J. Phys.: Conf. Ser.

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A plasma fluid model is being developed for the simulation of a direct current plasma discharge simulation including the sheath regions. The code uses a second order centered finite difference scheme and time integration is done by strong stability preserving third order Runge-Kutta method. The separation of scalar and vectorial quantities in two different grids gives stable results. After validation by comparison with theoretical ion sheath profiles, a one dimensional direct current argon discharge was simulated and compared to 1D3v particle-in-cell simulation results. It is shown that the inclusion of a non constant ion temperature profile is mandatory in fluid models in order to recover correct increase of ion velocity in sheaths and thus to simulate direct current (DC) discharges where collisions are not negligible in the sheaths.

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“…The behavior of plasma at material wall of a container is always a fascinating event which is one of the olderst problems in plasma [1] and is still not fully understood [2][3][4][5][6][7]. A thin layer that is formed close to a wall facing plasma and has sharp gradients is known as the plasma sheath.…”

Section: Introductionmentioning

confidence: 99%

Effect of Permittivity of Plasma Medium on the Particle Properties and Electric Field in a Magnetized Plasma Sheath

2022

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The plasma sheath, a thin layer having sharp gradients, is necessary to be formed at any material wall in exposure with plasma for its stability. Characteristics of magnetized plasma sheath formed in front of a material wall for different permittivity of plasma medium has been studies using the kinetic trajectory simulation (KTS) model. The electron density, ion density, electric field and potential decreases on moving away from the sheath entrance but total charge density increases. As plasma is composed of charged particles, any variation in the permittivity of the medium has significant effects on the sheath properties. It is found that on increasing the permittivity of the medium, the electric potential strength and hence electric field decreases because of increased shielding ability of the plasma. The results are in qualitative agreement with earlier studies based on the fluid approach but the kinetic approach is more accurate quantitatively providing a better perception of plasma-wall transition phenomena.

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Full fluid moment model for low temperature magnetized plasmas

Cited by 39 publications

References 37 publications

Using electron fluid models to analyze plasma thruster discharges

Using electron fluid models to analyze plasma thruster discharges

Ion temperature profile importance in collisional sheath modelling

Effect of Permittivity of Plasma Medium on the Particle Properties and Electric Field in a Magnetized Plasma Sheath

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