Anode position influence on discharge modes of a LaB6 cathode in diode configuration

Potrivitu, George-Cristian; Joussot, Romain; Mazouffre, S.

doi:10.1016/j.vacuum.2018.02.010

Cited by 28 publications

(33 citation statements)

References 32 publications

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“…The nature of the regimes may be further investigated by a consideration of the discharge voltage standard deviation. In this work, no measured voltage oscillations exceed 2% of the mean voltage; this was the threshold described in reference [32] for a spot-plume transition. For all the discharge conditions explored experimentally, the discharge appears to remain in the spot mode, according to this criterion.…”

Section: Discharge Current Explorationsupporting

confidence: 63%

“…The spot mode is usually the operation mode desired and is associated with high electron density, low electron temperature (Csiky identified this mode with temperatures in the range of 0.5 eV [2]) and low discharge oscillation. The plume mode is associated with lower electron density, higher electron temperature (in the range of 1 -2 eV in reference [2]) and higher oscillations of the discharge voltage and current (a ratio I d,std /I d,mean above few percent is usually attributed to the plume mode [32]), leading to a lower cathode lifetime [33]. The experimental work presented in this article focuses on discharge conditions for which the cathode discharge is in the so-called spot mode.…”

Section: Cathode Details and Operationmentioning

confidence: 99%

“…The separation between the spot and plume regimes has been shown to be dependent on a number of factors, including discharge parameters and anode distance [2,32,48]. The spot-plume transition may not necessarily be a sharply-defined boundary, as shown by Csiky [2], and the two regimes may be separated by a transition regime, as shown by Kaufman [49].…”

Section: Discharge Current Explorationmentioning

confidence: 99%

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Electron properties of an emissive cathode: analysis with incoherent thomson scattering, fluid simulations and Langmuir probe measurements

Vincent¹,

Tsikata²,

Potrivitu³

et al. 2020

J. Phys. D: Appl. Phys.

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Emissive cathodes serve a key function as the electron source for Hall plasma thrusters. Development of reliable numerical models for their operation and information on plasma behavior requires the use of sensitive and accurate diagnostics. This paper discusses results from a combined experimental and numerical study of the plasma regimes and properties of a 5 A LaB 6 pellet emitter cathode. Electron properties across a range of currents (2-16 A) are determined for the first time using incoherent Thomson scattering. A 2D axisymmetric fluid code is adapted to the study of the electron properties of this cathode and the nature of regime transitions. Similar trends in the numerical and experimental results are found, such as transitions to plume-like behavior with increasing current; quantitative agreement would require the use of a combined thermal-plasma model for the cathode under study. Comparisons of results from non-invasive Thomson scattering to Langmuir probe measurements reveal limitations of the latter diagnostic for plasma characterization.

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Section: Discharge Current Explorationsupporting

confidence: 63%

Section: Cathode Details and Operationmentioning

confidence: 99%

Section: Discharge Current Explorationmentioning

confidence: 99%

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Electron properties of an emissive cathode: analysis with incoherent thomson scattering, fluid simulations and Langmuir probe measurements

Vincent¹,

Tsikata²,

Potrivitu³

et al. 2020

J. Phys. D: Appl. Phys.

Self Cite

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“…During operation, the thruster body is floating. A heated 5 A-class hollow cathode with a disk-shaped LaB 6 emitter was used to generate the electron current [5,41]. The cathode is located outside the channel with its orifice in the vertical plane that contains the channel outlet, tilted towards the thruster.…”

Section: W-class Hall Thrustermentioning

confidence: 99%

Optimization of a Faraday Cup Collimator for Electric Propulsion Device Beam Study: Case of a Hall Thruster

Hugonnaud

Mazouffre

2021

Applied Sciences

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A Faraday cup (FC) is an instrument dedicated to current measurement in beams, jets and plasmas. It consists of a set of polarized electrodes mounted in such a way plasma sheath effect can be neglected, yielding accurate and reliable results. A FC is composed of three main parts, namely a collector or cup, which collects the current, a collimator, which defines the collection area and can contribute to limit electrons from entering the cup and a housing which protects the instrument from perturbation caused by the surrounding medium. In this paper, we provide experimental results of the effect of the collimator upon the measured ion current within the beam of a low-power Hall thruster. Different collimator materials, aperture diameters and polarization voltages are studied to determine the optimum design. Minimum dimension as well as appropriate materials are given as a conclusion in the case of low-power Hall thruster beam investigation.

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“…An external igniter electrode has been added to the cathode to ease ignition. The igniter design is based on the one of the 5 A-class cathode studied in our laboratory [19,20]. The igniter is a 2 mm in diameter tungsten rod placed 2 mm downstream the cathode keeper orifice.…”

Section: Cathode Architecturementioning

confidence: 99%

Discharge and plasma plume characterization of a 100 A-class LaB6 hollow cathode

Mazouffre

Joussot

Vincent

et al. 2021

Journal of Applied Physics

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Anode position influence on discharge modes of a LaB6 cathode in diode configuration

Cited by 28 publications

References 32 publications

Electron properties of an emissive cathode: analysis with incoherent thomson scattering, fluid simulations and Langmuir probe measurements

Electron properties of an emissive cathode: analysis with incoherent thomson scattering, fluid simulations and Langmuir probe measurements

Optimization of a Faraday Cup Collimator for Electric Propulsion Device Beam Study: Case of a Hall Thruster

Discharge and plasma plume characterization of a 100 A-class LaB6 hollow cathode

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