Experimental observation of low-frequency interactions at different scales and evidence of transit time oscillations in a Hall thruster: Spectral analysis

• DOI: 10.1063/5.0206369
• Publication Date: 2024-07-19T23:43:52Z
• Authors: Q. Delavière—Delion; F. Gaboriau; G. Fubiani; L. Garrigues
• Keywords: Oscillation (cell signaling)

Hall thrusters are E×B plasma devices characterised by a large azimuthal electron current, which is involved in the formation of wide variety instabilities on different frequency scales (from kilohertz to gigahertz) and propagating directions. We have focused limited number low-frequency that could be experimentally observed, such as breathing mode (BM) ion transit time oscillations (ITTO). There still gray areas understanding mechanisms behind these instabilities, often described individually, without considering an eventual exchange information between types instability. A wavelet time-frequency study revealed coexistence interdependence distinct instabilities. suspect possible interaction higher-frequency leading ITTOs: it was shown transition occurred when one BM harmonics became multiple oscillations. This also accompanied deformation energy distribution functions.