Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.555e..12b&link_type=abstract
Proceedings of the 4th International Spacecraft Propulsion Conference (ESA SP-555). 2-9 June, 2004, Chia Laguna (Cagliari), Sard
Physics
Scientific paper
Longitudinal waves with a phase velocity close to the velocity of ions have been recurrently observed in Hall thruster experiments and simulations. It is shown that this so-called ion transit-time instability may arise in the simplest one-dimensional fluid model of a Hall thruster discharge in which cold ions are accelerated between two electrodes within a quasineutral plasma. The analysis of high frequency, quasineutral ion acoustic waves reveals that under adequate circumstances and in particular for high ionization levels, one of the two acoustic waves is strongly amplified. Forcing then a constant potential drop between the electrodes, the response of the discharge cur- rent to plasma perturbations provides a feedback poten- tially able to trigger an unstable resonance of ion acoustic waves. The frequency and growth rate of such an insta- bility are calculated for a supersonic ion flow. The scaling of the frequency with the ion transit-time and the role of the ionization degree on their onset are qualitatively ex- plained.
Barral S.
Dudeck Michel
Makowski Knut
Peradzynski Zbigniew
No associations
LandOfFree
Longitudinal Oscillations in Hall thrusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Longitudinal Oscillations in Hall thrusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Longitudinal Oscillations in Hall thrusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-840422