Plasma oscillations in Hall thrusters

2001/04/01 by E. Y. Choueiri, Edgar Choueiri · 2 citations
Engineering · Physics and Astronomy · #Dust and Plasma Wave Phenomena #Electrohydrodynamics and Fluid Dynamics #Plasma Diagnostics and Applications

paper · doi:10.1063/1.1354644

openalex publication_date 2001/04/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04

Abstract

The nature of oscillations in the 1 kHz–60 MHz frequency range that have been observed during operation of Hall thrusters is quantitatively discussed. Contours of various plasma parameters measured inside the accelerating channel of a typical Hall thruster are used to evaluate the various stability criteria and dispersion relations of oscillations that are suspected to occur. A band by band up-to-date overview of the oscillations is carried out with a description of their observed behavior and a discussion of their nature and dependencies through comparison of the calculated contours to reported observations. The discussion encompasses the excitation of low frequency azimuthal drift waves that can form a rotating spoke, axially propagating “transit-time” oscillations, azimuthal drift waves, ionization instability-type waves, and wave emission peculiar to weakly ionized inhomogeneous plasmas in crossed electric and magnetic fields.

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