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Numerical Simulation of High Frequency Wave Coupling within a Hall Thruster

Knoll, AK, Gascon, N and Cappelli, M (2007) Numerical Simulation of High Frequency Wave Coupling within a Hall Thruster In: 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2007-07-08 - 2007-07-11, Cincinnati, OH, USA.

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A 2-dimensional Hall thruster simulation has been developed in the axial-azimuthal coordinate plane. The goal of this simulation is to numerically model high frequency plasma waves within the discharge channel of the Hall thruster, and study the contribution of these waves to the time-averaged axial electron drift. This model uses a continuum (fluid) representation for both the electrons and ions. In order to simulate oscillations in the electron field it was necessary to model the electrons dynamically, as opposed to assuming a steady state solution at each time step. The electron momentum equations also include electron inertia terms that are normally neglected in typical Hall thruster models. These inertia terms provide a wave coupling mechanism between axially and azimuthally propagating waves. This numerical model was able to reproduce two dominant high frequency plasma oscillations in the Hall thruster: a 74MHz Kelvin-Helmholtz type shearing instability, and a 7MHz oscillation in the plasma density that has also been observed experimentally. The simulation was successful at predicting the axial electron drift in good agreement with experiment. The results of this study suggest that the plasma oscillations play a dominant role in the electron transport process. In particular, contributions to the electron transport resulting from perturbations in the azimuthal electron velocity were found to be greater than 300% of classical collisional transport.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Surrey Space Centre
Authors :
Knoll, AK
Gascon, N
Cappelli, M
Date : 8 July 2007
DOI : 10.2514/6.2007-5266
Additional Information : Copyright 2007 American Institute of Aeronautics and Astronautics (AIAA)
Depositing User : Symplectic Elements
Date Deposited : 29 Oct 2013 15:05
Last Modified : 31 Oct 2017 15:13

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