Dispersion relation of high-frequency plasma oscillations in Hall thrusters

Lazurenko, A.; Coduti, G.; Mazouffre, S.; Bonhomme, Gérard

doi:10.1063/1.2889424

Cited by 27 publications

(25 citation statements)

References 18 publications

(30 reference statements)

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“…Each crossing of the observation volume by a region of plasma with higher density than the mean electron density would Here, we draw a distinction between the results from this Letter and the numerous other studies on azimuthal instabilities in the magnetron. The mode detected via probes by Lundin et al [15] and Winter et al [16] and described as the modified two-stream instability is a largewavelength (several cm) drift instability with MHz frequen cies, similar to that detected in the Hall thruster context by Lazurenko et al [17]. Azimuthal large scale structures with kHz periodicities, described as being driven by ionization and density gradients, have been identified by other authors ( [14], [18], [19], among others).…”

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confidence: 67%

Modulated Electron Cyclotron Drift Instability in a High-Power Pulsed Magnetron Discharge

Tsikata

Minea

2015

Phys. Rev. Lett.

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The electron cyclotron drift instability, implicated in electron heating and anomalous transport, is detected in the plasma of a planar magnetron. Electron density fluctuations associated with the mode are identified via an adapted coherent Thomson scattering diagnostic, under direct current and high-power pulsed magnetron operation. Time-resolved analysis of the mode amplitude reveals that the instability, found at MHz frequencies and millimeter scales, also exhibits a kHz-scale modulation consistent with the observation of larger-scale plasma density nonuniformities, such as the rotating spoke. Sharply collimated axial fluctuations observed at the magnetron axis are consistent with the presence of escaping electrons in a region where the magnetic and electric fields are antiparallel. These results distinguish aspects of magnetron physics from other plasma sources of similar geometry, such as the Hall thruster, and broaden the scope of instabilities which may be considered to dictate magnetron plasma features.

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confidence: 67%

Modulated Electron Cyclotron Drift Instability in a High-Power Pulsed Magnetron Discharge

Tsikata

Minea

2015

Phys. Rev. Lett.

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“…Fluctuations in the HF, megahertz range have been so observed, but only at large spatial scales, on the order of the thruster circumference with large phase velocities on the order of the E ជ ϫ B ជ drift velocity. 10 The most appropriate means for remotely investigating electron fluctuations inside plasmas is collective light scattering. 11 It has been used in very different situations in tokamaks, 12,13 space, 14 and magnetized laboratory devices.…”

Section: Dispersion Relations Of Electron Density Fluctuations In a Hmentioning

confidence: 99%

Dispersion relations of electron density fluctuations in a Hall thruster plasma, observed by collective light scattering

et al. 2009

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International audienceKinetic models and numerical simulations of E×B plasma discharges predict microfluctuations at the scales of the electron cyclotron drift radius and the ion plasma frequency. With the help of a specially designed collective scattering device, the first experimental observations of small-scale electron density fluctuations inside the plasma volume are obtained, and observed in the expected ranges of spatial and time scales. The anisotropy, dispersion relations, form factor, amplitude, and spatial distribution of these electron density fluctuations are described and compared to theoretical expectations

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“…Low frequency mode (7)(8)(9)(10)(11)(12) From the observations in Sec. III, we summarize the characteristics of the fluctuations in the normalized light intensity at 7-12 kHz:…”

Section: Interpretation Of Experimentally Observed Modesmentioning

confidence: 99%

“…This is an important, unresolved question in light of the effect oscillations have been proposed to have on processes such as cathode erosion [6][7][8] and anomalous transport. [9][10][11][12][13][14][15][16] Moreover, with new missions enabled by MS technology calling for higher specific impulse and power over longer timescales, 17,18 there is a need for high-fidelity models for thruster performance. Our uncertainty about the underlying processes governing thruster oscillations limits our ability to self-consistently achieve this end as any accurate model must be supplemented with empirical scaling laws or experimental measurements of the thruster in question.…”

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confidence: 99%

Plasma oscillations in a 6-kW magnetically shielded Hall thruster

Jorns

Hofer

2014

Physics of Plasmas

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A time-resolved laser induced fluorescence study on the ion velocity distribution function in a Hall thruster after a fast current disruption Phys. Plasmas 16, 043504 (2009); 10.1063/1.3112704 Internal plasma potential measurements of a Hall thruster using xenon and krypton propellant Phys. Plasmas 13, 093502 (2006); 10.1063/1.2335820 Spectral analysis of Hall-effect thruster plasma oscillations based on the empirical mode decompositionPlasma oscillations from 0-100 kHz in a 6-kW magnetically shielded Hall thruster are experimentally characterized with a high-speed, optical camera. Two modes are identified at 7-12 kHz and 70-90 kHz. The low frequency mode is found to be azimuthally uniform across the thruster face, while the high frequency oscillation is peaked close to the centerline-mounted cathode with an m ¼ 1 azimuthal dependence. An analysis of these results in the context of wavebased theory suggests that the low frequency wave is the breathing mode oscillation, while the higher frequency mode is gradient-driven. The effect of these oscillations on thruster operation is examined through an analysis of thruster discharge current and a comparison with published observations from an unshielded variant of the thruster. Most notably, it is found that although the oscillation spectra of the two thrusters are different, they exhibit nearly identical steady-state behavior. V C 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4879819] PHYSICS OF PLASMAS 21, 053512 (2014) This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP: 193.0.65.67 On: Tue, 25 Nov 2014 14:28:57 FIG. 3. (a) Phase of the mode at 7-12 kHz as a function of normalized position. The reference point ðr 0 ; h 0 Þ employed to generate this plot is located in the channel. (b) Phase of the mode at 70-90 kHz. The reference point ðr 0 ; h 0 Þ for this plot is located off-axis at r 0 ¼ 0.05r c .

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Dispersion relation of high-frequency plasma oscillations in Hall thrusters

Abstract: Articles you may be interested inDevice convolution effects on the collective scattering signal of the E×B mode from Hall thruster experiments: 2D dispersion relation

Cited by 27 publications

References 18 publications

Modulated Electron Cyclotron Drift Instability in a High-Power Pulsed Magnetron Discharge

Modulated Electron Cyclotron Drift Instability in a High-Power Pulsed Magnetron Discharge

Dispersion relations of electron density fluctuations in a Hall thruster plasma, observed by collective light scattering

Plasma oscillations in a 6-kW magnetically shielded Hall thruster

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