Measurements and theory of driven breathing oscillations in a Hall effect thruster

Hara, Kentaro; Keller, S.; Raitses, Yevgeny

doi:10.2514/6.2016-4532

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…Indeed, the estimate for ϕ Nn is similar to the prediction of 90 • for weakly ionized plasmas (i.e. N i,0 ≪ N n,0 ) in the ionization theory of [49].…”

Section: Time-dependent Plasma Estimationsupporting

confidence: 80%

State estimation of the dynamic behavior of plasma properties in a Hall effect thruster discharge

Troyetsky

Greve

Tsikata

et al. 2023

J. Phys. D: Appl. Phys.

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The dynamic behaviors of the plasma properties in a Hall effect thruster discharge channel are estimated using a physics-constrained extended Kalman filter (PC-EKF) with a zero-dimensional global plasma model. The state estimates obtained using the global plasma EKF model are augmented by experimental data, such as a discharge current signal. The use of state estimation allows for the determination of time-resolved plasma behaviors that may be difficult to measure experimentally, such as electron temperature and bulk velocity. The model is applied to investigate the plasma behavior at various thruster operating conditions, i.e., at varying discharge voltages and discharge currents. The estimated plasma properties are used to determine the classical electron collision frequency and the anomalous electron scattering frequency, which are shown to vary in time.

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“…Indeed, the estimate for ϕ Nn is similar to the prediction of 90 • for weakly ionized plasmas (i.e. N i,0 ≪ N n,0 ) in the ionization theory of [49].…”

Section: Time-dependent Plasma Estimationsupporting

confidence: 80%

State estimation of the dynamic behavior of plasma properties in a Hall effect thruster discharge

Troyetsky

Greve

Tsikata

et al. 2023

J. Phys. D: Appl. Phys.

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“…The most common type of oscillations, so-called breathing mode (BM), appears within the range of 10 -60 kHz. The mechanism of these large amplitude low frequency volumetric oscillations has been investigated with simple analytical models of prey-predator type for the neutral gas ionization (0D model) [11][12][13][14], as well as with more sophisticated theories [15][16][17]. The BM appears in numerical simulations even within 1D description [16,18,19] and are unambiguously reproduced by 2D models, e. g. [20].…”

Section: Discharge Current Oscillationsmentioning

confidence: 99%

Searching for Chaotic Behavior in the Ion Current Waveforms of a Hall Effect Thruster

et al. 2022

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The dynamics of the ion flux expelled by a 0.5 kW-class Hall thruster supplied with krypton was examined in a wide range of discharge voltages. A homemade Faraday probe installed onto a rotary arm was used for reconstructing angular profiles of the plasma plume 0.5 m downstream of the thruster exit plane. The time dependence of the ion current was measured along the thruster axis. For investigating the signal dynamics, a Fourier approach as well as methods of nonlinear time series analysis like bifurcation diagrams and recurrence plot techniques were applied, which are of interest for chaotic behavior identification. Along with the well-known breathing mode (10—30 kHz), other characteristic groups of oscillations were also detected. The bifurcation diagram revealed a drastic transition between large and small amplitude oscillating regimes while varying the discharge voltage from 550 to 700 V. In parallel to this transition, recurrent plots display a qualitative change from a periodic (or quasi periodic) oscillating regime to much less predictable dynamics.

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“…The impact of the ionization zone shift on discharge oscillations is mainly reflected in the suppressed low-frequency oscillations. There are low-frequency oscillations (10-50 kHz) in the discharge current of the Hall thrusters caused by insufficient replenishment of propellant atoms in the ionization process under magnetic field [62][63][64][65]. In this paper, we have collected the discharge current oscillation curves under different magnetic field deflections and performed a simple analysis, as shown in figure 12.…”

Section: Discharge Oscillationsmentioning

confidence: 99%

Magnetic field deflection in a 100 W Hall thruster with permanent magnets

Zhang

Ren

Tang

et al. 2022

Plasma Sources Sci. Technol.

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The compact structure restrains the application of magnetic shielding in low-power Hall thrusters, leading to an asymmetric magnetic field or partial magnetic shielding of the channel wall. This study employs a trim coil to implement an asymmetric magnetic configuration in a 100 W laboratory Hall thruster. The locations of the maximum curvature of magnetic lines are deflected toward the inner and outer channel wall corresponding to the inward and outward deflected magnetic field configurations. Effects of the magnetic field deflection on the position of the ionization zone, efficiency of the thruster, discharge oscillations, and wall erosion are studied. Optical imaging and electrostatic probes are employed to monitor and scan the plasma beam. Experimental results show that the outward deflection induces a change in the magnetic mirror effect and alters the location of the ionization zone. The radial movement of the ionization zone away from the inner channel wall decreases the near-wall conductivity, reducing the election current by 13.5% and promoting the current efficiency. Discharge oscillations are suppressed, and the propellant utilization efficiency is improved by 8.2%. Erosion of the channel wall shows an improvement of 40%. Generally, an outward deflected magnetic configuration can significantly improve the performance of low-power Hall thrusters.

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Measurements and theory of driven breathing oscillations in a Hall effect thruster

Cited by 9 publications

References 8 publications

State estimation of the dynamic behavior of plasma properties in a Hall effect thruster discharge

State estimation of the dynamic behavior of plasma properties in a Hall effect thruster discharge

Searching for Chaotic Behavior in the Ion Current Waveforms of a Hall Effect Thruster

Magnetic field deflection in a 100 W Hall thruster with permanent magnets

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