Effect of ionization distribution on the low frequency oscillations mode in Hall thrusters

Wei, Liqiu; Wang, Chunsheng; Han, Koeun; Yu, Daren

doi:10.1063/1.3676160

Cited by 24 publications

(7 citation statements)

References 18 publications

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“…One can see that, when the main excitation current I m is in the range of 3.0 to 5.0 A, both I d and I d are at a very low level, which corresponds to a stable discharge; however, beyond that range, both I d and I d increase sharply and the discharge becomes unstable. This magnetic mapping characteristic is consistent with those found in many other Hall thrusters [15][16][17][18].…”

Section: Experimental Results and Analysissupporting

confidence: 91%

“…It should be emphasized again that the temper ature measurement is conducted over a magnetic field strength range that allows the P100 to work stably. The 'stable' region is equivalent to the local mode [15], oscillation mode B interval [17], and the classical diffusion region [33] that is defined by different researchers. In the stable region, the changes in the discharge current mean and RMS are small, the RMS itself is also small, and the thruster performance is high [15].…”

Section: Influencing Mechanism Of the Magnetic Fieldmentioning

confidence: 99%

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Experimental study of effect of magnetic field on anode temperature distribution in an ATON-type Hall thruster

Liu

Wei³

et al. 2018

J. Phys. D: Appl. Phys.

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The energy deposition caused by the absorption of electrons by the anode is an important cause of power loss in a Hall thruster. The resulting anode heating is dangerous, as it can potentially reduce the thruster lifetime. In this study, by considering the ring shape of the anode of an ATON-type Hall thruster, the effects of the magnetic field strength and gradient on the anode ring temperature distribution are studied via experimental measurement. The results show that the temperature distribution is not affected by changes in the magnetic field strength and that the position of the peak temperature is essentially unchanged; however, the overall temperature does not change monotonically with the increase of the magnetic field strength and is positively correlated with the change in the discharge current. Moreover, as the magnetic field gradient increases, the position of the peak temperature gradually moves toward the channel exit and the temperature tends to decrease as a whole, regardless of the discharge current magnitude; in any case, the position of the peak temperature corresponds exactly to the intersection of the magnetic field cusp with the anode ring. Further theoretical analysis shows that the electrons, coming from the ionization region, travel along two characteristic paths to reach the anode under the guidance of the cusped magnetic field configuration. The change of the magnetic field strength or gradient changes the transfer of momentum and energy of the electrons in these two paths, which is the main reason for the changes in the temperature and distribution. This study is instructive for matching the design of the ring-shaped anode and the cusp magnetic field of an ATON-type Hall thruster.

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Section: Experimental Results and Analysissupporting

confidence: 91%

Section: Influencing Mechanism Of the Magnetic Fieldmentioning

confidence: 99%

Experimental study of effect of magnetic field on anode temperature distribution in an ATON-type Hall thruster

Liu

Wei³

et al. 2018

J. Phys. D: Appl. Phys.

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“…Subsequently, the low-frequency oscillations have been well reproduced by numerous time-dependent numerical models [8][9][10]. Recently, Barral, Yu, Wei, and Wang et al have conducted considerable research [11][12][13][14][15][16][17][18][19][20][21][22][23] on the influencing factors, physical mechanisms, and stability of low-frequency oscillations.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of low-frequency discharge oscillations in a 5 kW Hall thruster

Yang¹,

Zhang²,

Chen³

et al. 2018

Plasma Sci. Technol.

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A two-dimensional particle-in-cell plasma model is built in the R-Z plane to investigate the lowfrequency plasma oscillations in the discharge channel of a 5 kW LHT-140 Hall thruster. In addition to the elastic, excitation, and ionization collisions between neutral atoms and electrons, the Coulomb collisions between electrons and electrons and between electrons and ions are analyzed. The sheath characteristic distortion is also corrected. Simulation results indicate the capability of the built model to reproduce the low-frequency oscillation with high accuracy. The oscillations of the discharge current and ion density produced by the model are consistent with the existing conclusions. The model predicts a frequency that is consistent with that calculated by the zero-dimensional theoretical model.

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“…This model is also used to study the relationship between low frequency oscillation modes and the ionization distribution in a recent study. 21 In this model, the plasma is assumed to be quasi-neutrality. Atomic velocity along the channel is constant and there are only singly charged ions in the channel.…”

Section: Numerical Simulation Verification and Discussionmentioning

confidence: 99%

Modulating action of low frequency oscillations on high frequency instabilities in Hall thrusters

Wei

Han

Yang

et al. 2015

Journal of Applied Physics

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It is found that the low frequency oscillations have modulating action on high frequency instabilities in Hall thrusters. The physical mechanism of this modulation is discussed and verified by numerical simulations. Theoretical analyses indicate that the wide-range fluctuations of plasma density and electric field associated with the low frequency oscillations affect the electron drift velocity and anomalous electron transport across the magnetic field. The amplitude and frequency of high frequency oscillations are modulated by low frequency oscillations, which show the periodic variation in the time scale of low frequency oscillations. V C 2015 AIP Publishing LLC.

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Effect of ionization distribution on the low frequency oscillations mode in Hall thrusters

Cited by 24 publications

References 18 publications

Experimental study of effect of magnetic field on anode temperature distribution in an ATON-type Hall thruster

Experimental study of effect of magnetic field on anode temperature distribution in an ATON-type Hall thruster

Numerical study of low-frequency discharge oscillations in a 5 kW Hall thruster

Modulating action of low frequency oscillations on high frequency instabilities in Hall thrusters

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