Transit-time instability in Hall thrusters

Barral, S.; Makowski, Karol; Peradzyński, Z.; Dudeck, Michel

doi:10.1063/1.1947796

Cited by 67 publications

(60 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3(a). The propagation velocity of these oscillations lies very cióse to the velocity of ions, which leaves little doubt as to their relationship to the so-called ion transit n [10 18 instability [23,24]. These fast oscillations are markedly absent in the LF model.…”

Section: E Numerical Study Of the Low-frequency Modelmentioning

confidence: 99%

Low-frequency model of breathing oscillations in Hall discharges

2009

Self Cite

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: E Numerical Study Of the Low-frequency Modelmentioning

confidence: 99%

Low-frequency model of breathing oscillations in Hall discharges

2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…The cathode discharge is known to be the source of noise [20], which can propagate to the thruster plasma [21]. Besides, the cathode plasma sets a boundary condition for the thruster discharge, and, thus, can directly affect the global discharge behavior [22].…”

Section: Discussionmentioning

confidence: 99%

Controlling the Plasma Flow in the Miniaturized Cylindrical Hall Thruster

Smirnov¹

2008

View full text Add to dashboard Cite

A substantial narrowmg of the plume of the cylindrical RaIl thruster (CRT) was observed upon the enhancement of the electron emission from the hollow cathode discharge, which implies the possibility for the thruster efficiency increase due to the ion beam focusing. It is demonstrated that the miniaturized CRT can be operated in the non-self-sustained regime, with the discharge current limited by the cathode electron emission. The thruster operation in this mode greatly expands the range of the plasma and discharge parameters normally accessible for the CRT.

show abstract

“…Xhese are so-called transit time oscillations which were observed in experiments [7,8], predicted by numerical models [9], and analyzed theoretically [10]. In our previous experiment with PPS®-100 HEX [5] the oscillations of this ME range could be resolved due to the use of empirical mode decomposition (EMD) method [11] however, just for PPS®-XOOO HEX operating at high voltage oscillations of ME range can be strong enough to be resolved with visual inspection of signals and even mask the slow breathing mode.…”

Section: Introductionmentioning

confidence: 99%

Where is the breathing mode ? High voltage Hall effect thruster studies with EMD method

Kurzyna¹,

Makowski²,

Peradzyński

et al. 2008

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Discharge current and local plasma oscillations are studied in a high voltage Hall effect thruster PPS®-XOOO. Characteristic time scales that appear in different operating conditions are resolved with the use of Hilbert-Huang spectra (HHS) which display time dependenc of instantaneous frequency and power. Sets of intrinsic mode functions (i'm/s) that are used for HHS calculation result due to application of empirical mode decomposition method (EMD) to nonstationary multicomponent signals. In the experiment the signals are captured in the electric circuit of the thruster as well locally, in the vicinity of the thruster exhaust region. Classical electric probes spaced along the azimuth and/or thruster axis let us study correlations of signals which were captured in different locations. In this way azimuthal and axial propagation of disturbances is inspected. The discharge voltage is varied in the range of 200 -^ 900 V while xenon mas flow rate of 5 -^ 9 mg/s. LF, MF, and HF characteristic bands that are known from previous studies of PPS®-100 thruster have been also detected here. However, expanding discharge current onto a set of intrinsic modes we can resolve MF mode more reliably than before. Moreover, for higher discharge voltages, this irregular mode turns into more regular waveform and tends to dominate in the discharge current masking almost completely the breathing mode (LF oscillations of the discharge current). In such a case triggering of HF oscillations is correlated with the phase of MF mode while in the case of PPS®-100 thruster it was correlated with the appropriate phase of the breathing mode (LF band). Regular HF emission that can be unambiguously interpreted as azimuthal electrostatic wave now is observed only in the specific operating conditions of the thruster. However, even if irregular HF emission is observed the time delay of cross-correlated signals which are captured in different azimuthal locations corresponds to the velocity of azimuthal electron drift in the field of magnetic barrier.

show abstract

Transit-time instability in Hall thrusters

Cited by 67 publications

References 10 publications

Low-frequency model of breathing oscillations in Hall discharges

Low-frequency model of breathing oscillations in Hall discharges

Controlling the Plasma Flow in the Miniaturized Cylindrical Hall Thruster

Where is the breathing mode ? High voltage Hall effect thruster studies with EMD method

Contact Info

Product

Resources

About