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1 Journal of Technical Physics

1 2008

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Causality violation in analysis of Hall thruster plasma instabilities

Peradzyński Z., Barral S., Makowski K., Dudeck M.

Journal of Technical Physics

2008

Vol. 49, no 3-4

315-327

Using the fluid equations of Hall thruster plasma we analyze the influence of the electron energy balance on the stability of ion sound modes. For sufficiently low frequencies (ω < 5 • 106^6 s-1 in the case of SPT-100) the gains and losses in the source term are approximately equal, thus the temperature can be in principle determined in terms of other dependent variables. This permits one to reduce the number of equations by one. It appears however, that the new system can have in some regions complex characteristics. This in turn implies instability of certain modes with frequencies lower than the critical frequency.