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Descripción
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| In this paper recent results based on a local linear stability analysis of the ionization region a Hall Thruster are presented. A one dimensional azimuthal framework is used including three species: neutrals, singly-charged ions and electrons. A simplified linear model is developed with the aim of deriving analytical expressions that characterize the instability. The results indicate the existence of an instability that gives rise to an azimuthal oscillation with a mode number m = 1. According to the model, the instability seems to appear only in regions where the ionization and the electric field make it possible to have positive gradients of plasma density and ion velocity at the same time. A more complex model is also solved numerically to validate the analytical results. Moreover, parametric analyses are carried out with respect to the main parameters of the complex model. As the temperature increases and the neutral-to-plasma density ratio decreases, the growth rate of the instability decreases down to a limit where azimuthal perturbations are no longer unstable. The computation of the eigenvalues and eigenvectors of the linear stability problem shows a correlation between the plasma density and electron axial velocity perturbations. Consequently, a net axial electron current is generated by this oscillation and thus it is possibly linked to anomalous diffusion. | |
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Internacional
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Si |
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Nombre congreso
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32nd International Electric Propulsion Conference |
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Tipo de participación
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960 |
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Lugar del congreso
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Wiesbaden, Germany |
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Revisores
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Si |
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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11/09/2011 |
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Fecha fin congreso
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15/09/2011 |
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Desde la página
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1 |
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Hasta la página
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13 |
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Título de las actas
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Proceedings of the 32nd International Electric Propulsion Conference |