scholarly journals Development of a 2D Axisymmetric Electron Fluid Model in Hall Thrusters

2017 ◽  
Author(s):  
Horatiu C. Dragnea ◽  
Kentaro Hara ◽  
Iain D. Boyd
Keyword(s):  
Fluid Model ◽  
Hall Thrusters ◽  
Electron Fluid

scholarly journals Numerical and Experimental Investigation of Longitudinal Oscillations in Hall Thrusters

Aerospace ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 148
Author(s):  
Vittorio Giannetti ◽  
Manuel Martín Saravia ◽  
Luca Leporini ◽  
Simone Camarri ◽  
Tommaso Andreussi
Keyword(s):  
Discharge Current ◽  
Fluid Model ◽  
Low Frequency ◽  
Hall Thruster ◽  
Hall Thrusters ◽  
Current Signal ◽  
Plasma Parameters ◽  
Plasma Properties ◽  
Breathing Mode ◽  
Spatio Temporal

One of the main oscillatory modes found ubiquitously in Hall thrusters is the so-called breathing mode. This is recognized as a relatively low-frequency (10–30 kHz), longitudinal oscillation of the discharge current and plasma parameters. In this paper, we present a synergic experimental and numerical investigation of the breathing mode in a 5 kW-class Hall thruster. To this aim, we propose the use of an informed 1D fully-fluid model to provide augmented data with respect to available experimental measurements. The experimental data consists of two datasets, i.e., the discharge current signal and the local near-plume plasma properties measured at high-frequency with a fast-diving triple Langmuir probe. The model is calibrated on the discharge current signal and its accuracy is assessed by comparing predictions against the available measurements of the near-plume plasma properties. It is shown that the model can be calibrated using the discharge current signal, which is easy to measure, and that, once calibrated, it can predict with reasonable accuracy the spatio-temporal distributions of the plasma properties, which would be difficult to measure or estimate otherwise. Finally, we describe how the augmented data obtained through the combination of experiments and calibrated model can provide insight into the breathing mode oscillations and the evolution of plasma properties.

Electron‐fluid model for dc size effect

1991 ◽  
Vol 69 (2) ◽  
pp. 816-820 ◽  
Author(s):  
R. Jaggi
Keyword(s):  
Size Effect ◽  
Fluid Model ◽  
Electron Fluid

Electron-Fluid Model for DC Size Effect under a Magnetic Field

1996 ◽  
Vol 158 (1) ◽  
pp. 161-168
Author(s):  
H. Polat ◽  
D. Kösker ◽  
M. Tomak
Keyword(s):  
Magnetic Field ◽  
Size Effect ◽  
Fluid Model ◽  
Electron Fluid

A length-scale formula for confined quasi-two-dimensional plasmas

2009 ◽  
Vol 75 (4) ◽  
pp. 437-454 ◽  
Author(s):  
TIMOTHY D. ANDERSEN ◽  
CHJAN C. LIM
Keyword(s):  
Angular Momentum ◽  
Fluid Model ◽  
Three Dimensional ◽  
Coulomb Gas ◽  
Mean Field Approximation ◽  
Length Scale ◽  
Two Dimensional ◽  
Electron Fluid ◽  
Euler’S Equations ◽  
Euler's Equations

AbstractTypically a magnetohydrodynamical model for neutral plasmas must take into account both the ionic and the electron fluids and their interaction. However, at short time scales, the ionic fluid appears to be stationary compared to the electron fluid. On these scales, we need consider only the electron motion and associated field dynamics, and a single fluid model called the electron magnetohydrodynamical model which treats the ionic fluid as a uniform neutralizing background applies. Using Maxwell's equations, the vorticity of the electron fluid and the magnetic field can be combined to give a generalized vorticity field, and one can show that Euler's equations govern its behavior. When the vorticity is concentrated into slender, periodic, and nearly parallel (but slightly three-dimensional) filaments, one can also show that Euler's equations simplify into a Hamiltonian system and treat the system in statistical equilibrium, where the filaments act as interacting particles. In this paper, we show that, under a mean-field approximation, as the number of filaments becomes infinite (with appropriate scaling to keep the vorticity constant) and given that angular momentum is conserved, the statistical length scale, R, of this system in the Gibbs canonical ensemble follows an explicit formula, which we derive. This formula shows how the most critical statistic of an electron plasma of this type, its size, varies with angular momentum, kinetic energy, and filament elasticity (a measure of the interior structure of each filament) and in particular it shows how three-dimensional effects cause significant increases in the system size from a perfectly parallel, two-dimensional, one-component Coulomb gas.

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