Experimental investigation of high-frequency drifting perturbations in Hall thrusters

Lazurenko, A.; Vial, Vanessa; Prioul, M.; Bouchoule, A.

doi:10.1063/1.1818698

Cited by 39 publications

(40 citation statements)

References 9 publications

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“…Most measurements of fluctuations in a Hall thruster plasma have been done using electrostatic probes and antennas, 7,8 or magnetic probes. 9 Since probes cannot withstand high-energy particles inside the plasma, these devices are placed around the channel external wall, outside the plasma; in addition, these probes cannot resolve small-scale spatial structures.…”

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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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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“…1,2,5 Among these instabilities, the high-frequency ͑HF͒ instability ͑its lower limit varies according to different references f ϳ 1-5 MHz͒ was shown to exist in the discharge of Hall thrusters in various theoretical works, [6][7][8] and it was experimentally identified as azimuthal wave with phase velocity close to the electron drift velocity v d = E z / B r in Hall thrusters of different design. 6,[9][10][11] Theoretical descriptions based on two-fluid models consider distabilizing effects associated with electron collisions and cross-field density gradients; they predict azimuthally propagating and axially localized waves. 6,[9][10][11] Theoretical descriptions based on two-fluid models consider distabilizing effects associated with electron collisions and cross-field density gradients; they predict azimuthally propagating and axially localized waves.…”

Section: Dispersion Relation Of High-frequency Plasma Oscillations Inmentioning

confidence: 99%

Dispersion relation of high-frequency plasma oscillations in Hall thrusters

et al. 2008

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“…Considering HET plasma oscillations it is, e.g., expected that locally induced microinstabilities may play a significant role in anomalous transport of electrons to the anode through magnetic field that is used for reduction of their mobility. In this context nonstationary HF emission (' -^ 10 -^ 50 MHz) induced in the vicinity of magnetic barrier has been analyzed and explained as an electrostatic drift wave that propagates along the azimuth [4,5]. On the other end of the time scale there are LF oscillations {^^ 20 -^ 30 kHz) outer magnetic pole I I known as a 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

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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.

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Experimental investigation of high-frequency drifting perturbations in Hall thrusters

Cited by 39 publications

References 9 publications

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

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

Dispersion relation of high-frequency plasma oscillations in Hall thrusters

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

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