Driving Low Frequency Breathing Oscillations in a Hall Thruster

Keller, S.; Raitses, Yevgeny; Diallo, A.

doi:10.2514/6.2014-3509

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…Heterodyne method. The heterodyne method for timeresolved LIF was developed by researchers at the Princeton Plasma Physics Laboratory [27,65,66] and applied to measuring xenon ion velocity distribution functions (IVDFs) in the cylindrical Hall thruster [71]. A sinusoidal modulation of 3-30 V is externally applied on top of the 220 V anode potential at a given frequency ω D .…”

Section: High Res Variablementioning

confidence: 99%

Time-resolved laser-induced fluorescence diagnostics for electric propulsion and their application to breathing mode dynamics

Young¹,

Fabris²,

MacDonald-Tenenbaum³

et al. 2018

Plasma Sources Sci. Technol.

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Several techniques have been developed recently for performing time-resolved laser-induced fluorescence (LIF) measurements in oscillating plasmas. One of the primary applications is characterizing plasma fluctuations in devices like Hall thrusters used for space propulsion. Optical measurements such as LIF are nonintrusive and can resolve properties like ion velocity distribution functions with high resolution in velocity and physical space. The goals of this paper are twofold. First, the various methods proposed by the community for introducing time resolution into the standard LIF measurement of electric propulsion devices are reviewed and compared in detail. Second, one of the methods, the sample-hold technique, is enhanced by parallelizing the measurement hardware into several signal processing channels that vastly increases the data acquisition rate. The new system is applied to study the dynamics of ionization and ion acceleration in a commercial BHT-600 Hall thruster undergoing unforced breathing mode oscillations in the 44-49 kHz range. A very detailed experimental picture of the common breathing mode ionization instability emerges, in close agreement with established theory and numerical simulations.

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Section: High Res Variablementioning

confidence: 99%

Time-resolved laser-induced fluorescence diagnostics for electric propulsion and their application to breathing mode dynamics

Young¹,

Fabris²,

MacDonald-Tenenbaum³

et al. 2018

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…For low power thrusters, these oscillations can be controlled and even mitigated by enhancing the electron supply from the cathode [4]. In addition, several recent studies demonstrated that these oscillations can be induced and driven by modulating the anode voltage with an additional AC power supply placed in series with the main DC power supply [5][6][7][8]. Figure 1 shows a typical modulation of thruster discharge voltage used in these previ- ous studies.…”

Section: Introductionmentioning

confidence: 99%

Studies of a modulated Hall thruster

Simmonds

Raitses

Smolyakov

et al. 2021

Plasma Sources Sci. Technol.

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A typical Hall thruster is powered from a DC power supply and operates with a constant discharge voltage. In operation, the discharge current is subject to strong low frequency oscillations (so-called breathing oscillations). Recent studies have shown that not only can these breathing oscillations be correlated with improved performance, but these oscillations can be induced and controlled by modulating the anode voltage. In this work, a systematic experimental study of the plasma flow in a modulated cylindrical Hall thruster was performed to characterize the effect of natural and modulated breathing oscillations on thruster performance. Measurements suggest that modulating the anode voltage in resonance with the natural breathing frequency does increase the thrust, but a corresponding phase alignment of discharge current and discharge voltage causes the efficiency gains to be insignificant. In addition, the outward shift of the acceleration region causes the plasma plume divergence to increase at the resonance condition and thereby, limit the thrust increase. Mechanisms underlying the relative phase between discharge current, ion current, and discharge voltage are investigated experimentally and corroborated with one-dimensional hybrid simulations of the thruster discharge.

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Experimental Study on Operating Range Extension of Hall Thrusters under Pulsating Mode

Wei

Cai

et al. 2023

J. Aerosp. Eng.

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Driving Low Frequency Breathing Oscillations in a Hall Thruster

Cited by 8 publications

References 16 publications

Time-resolved laser-induced fluorescence diagnostics for electric propulsion and their application to breathing mode dynamics

Time-resolved laser-induced fluorescence diagnostics for electric propulsion and their application to breathing mode dynamics

Studies of a modulated Hall thruster

Experimental Study on Operating Range Extension of Hall Thrusters under Pulsating Mode

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