Theory of oscillations and conductivity for Hall thruster

Baranov, Vladimir; Nazarenko, Yury; Petrosov, V. A.; Vasin, A. I.; Yashnov, Y.

doi:10.2514/6.1996-3192

Cited by 36 publications

(16 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are characterized by wide ac fluctuations of the discharge current that may at times exceed the level of the de current [1]. Although the first reports of this low-frequency mode date back from the 1970s [2], its interpretation as an ionization instability has gained wide acceptance only in the late 1990s [3,4]. Following the observation of a back-and-forth motion of the ionization front in numerical simulations [4,5], these oscillations are now commonly referred to as breathing oscillations.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency model of breathing oscillations in Hall discharges

2009

View full text Add to dashboard Cite

A paradigm for Hall discharge modeling is presented whereby only the time scale of the lowest-frequency mode is explicitly resolved. The ability of such a low-frequency model to reproduce with excellent accuracy the breathing mode is demonstrated through comparisons with a fully time-dependent numerical model. Based on this formalism, an approximate linearized model is derived which essentially constitutes a one-dimensional generalization of the classical zero-dimensional predator-prey model. The model highlights the interaction of standing plasma waves with the transport of neutral species, which involves standing and convective waves of similar magnitude. It predicts a frequency which is in cióse agreement with the frequency of the small perturbation modes observed in simulations. Finally, it is shown that unstable modes are in general strongly nonlinear and characterized by frequencies obeying a scaling law different from that of linear modes.

show abstract

Section: Introductionmentioning

confidence: 99%

Low-frequency model of breathing oscillations in Hall discharges

2009

View full text Add to dashboard Cite

show abstract

“…In particular, since long-time stable operation is required in a space mission, the development of a thruster design to probe the physical mechanisms of discharge current oscillation phenomenon is an urgent item. 1,2,[6][7][8][9][10][11][12] The present research focuses on the large-amplitude and low-frequency discharge current oscillation in 20 kHz-range (20 kHz-range oscillation), which is speculated to be a main cause for the deterioration of propulsive efficiency and operational instability among various oscillation phenomena observed in Hall thrusters. To propose a technique to control the amplitude, the relationship between amplitude and ionization-zone length is analytically targeted by using an unsteady one-dimensional numerical analysis, where the optimization of operating conditions and the best device design would be provided after the oscillation phenomenon and plasma states in an acceleration channel had been clarified.…”

Section: Low-frequency Oscillationmentioning

confidence: 99%

Control of Low-Frequency Oscillation in a Hall Thruster

Furukawa

Miyasaka

Fujiwara

2001

Trans. Japan Soc. Aero. S Sci.

View full text Add to dashboard Cite

The studies of low-frequency discharge current oscillation phenomena in the 20 kHz range causing a deterioration of propulsive efficiency and operational instability are important to improve Hall thruster performance. A possibility that the amplitude of 20 kHz-range oscillation could be controlled by changing ionization-zone length was predicted in our previous work, based on experiments and theoretical analyses. 1) In this paper, the physical mechanisms of the ionization process in the acceleration channel are studied by using an unsteady one-dimensional numerical analysis; the methods of controlling oscillation amplitude are concretely discussed from the viewpoint of ionization-zone length. The numerical code generated in the present study would be an effective tool for the best design of a Hall thruster.

show abstract

“…Several studies conducted on the oscillation phenomenon have revealed that this oscillation is caused by ionization instability. [13][14][15][16][17][18][19] However, these studies did not adequately describe this oscillation-especially the stability criteria for a given range of the magnetic flux density. This study aims to investigate plasma behavior in the acceleration channel using a high-speed camera and propose a physical model of the oscillation based on experimental results in order to suppress the discharge current oscillation.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Discharge Current Oscillations in a Hall Thruster

Yamamoto

Yokota

Watanabe

et al. 2005

Trans. Japan Soc. Aero. S Sci.

View full text Add to dashboard Cite

Results of controlling a discharge current oscillation in Hall thrusters at a frequency range of 10-100 kHz are presented. To understand the discharge current oscillation mechanism, the plasma behavior in the acceleration channel was observed with a high-speed camera using a 1-kW class, anode layer type Hall thruster. The emission intensity oscillates equably in the acceleration channel at the same period of the discharge current oscillation; the number density of excited xenon ions oscillates at the same oscillation period and is proportional to the discharge current. These results indicate that the discharge current oscillation is caused by the ionization instability and the number density of plasma oscillates equably in the acceleration channel. Furthermore, the oscillation amplitude was sensitive to the applied magnetic flux density, indicating that this oscillation is affected by electron mobility. The proposed oscillation model based on the experimental results demonstrated that the momentum transfer corresponding to a plasma fluctuation is crucial to achieving stability. Thus, the oscillation amplitude for various acceleration channel configurations-parallel and convergent-was measured, because channel configuration could affect the momentum transfer. The oscillation was successfully suppressed by adopting the convergent configuration, as shown by this model.

show abstract

Theory of oscillations and conductivity for Hall thruster

Cited by 36 publications

References 0 publications

Low-frequency model of breathing oscillations in Hall discharges

Low-frequency model of breathing oscillations in Hall discharges

Control of Low-Frequency Oscillation in a Hall Thruster

Suppression of Discharge Current Oscillations in a Hall Thruster

Contact Info

Product

Resources

About