Edge-to-center plasma density ratios in two-dimensional plasma discharges

Lucken, Romain; Croes, Vivien; Lafleur, Trevor; Raimbault, Jean; Bourdon, Anne; Chabert, Pascal

doi:10.1088/1361-6595/aaaf61

Cited by 8 publications

(12 citation statements)

References 20 publications

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“…An international effort is underway to preform 2D benchmarks for (non-magnetized) low-pressure low-temperature plasmas [322]. Recently, there has also been a renewed interest to carry out studies on plasma sheaths in low-pressure low-temperature plasmas and to use PIC simulations to guide the development of theoretical models [323].…”

Section: State Of the Art And Recent Progressmentioning

confidence: 99%

Physics of E × B discharges relevant to plasma propulsion and similar technologies

et al. 2020

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This paper provides perspectives on recent progress in the understanding of the physics of devices where the external magnetic field is applied perpendicularly to the discharge current. This configuration generates a strong electric field, which acts to accelerates ions. The many applications of this set up include generation of thrust for spacecraft propulsion and the separation of species in plasma mass separation devices. These "E×B" plasmas are subject to plasma-wall interaction effects as well as various micro and macro instabilities, and in many devices, we observe the emergence of anomalous transport. This perspective presents the current understanding of the physics of these phenomena, state-of-the-art computational results, identifies critical questions, and suggests directions for future research.

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Section: State Of the Art And Recent Progressmentioning

confidence: 99%

Physics of E × B discharges relevant to plasma propulsion and similar technologies

et al. 2020

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“…The results presented in this work were obtained using an independently developed 2D-3V PIC/MCC code called LPPic2D. 6,[42][43][44][45] In this code, a Cartesian geometry is used, but without any scaling factors applied to the permittivity or ion mass, so as to correctly preserve the relevant spatial and temporal scales. LPPic2D uses the classical structure of a 2D PIC/MCC code.…”

Section: Model Descriptionmentioning

confidence: 99%

The effect of alternative propellants on the electron drift instability in Hall-effect thrusters: Insight from 2D particle-in-cell simulations

et al. 2018

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Hall-effect thrusters (HETs) operated with xenon are one of the most commonly used electric propulsion technologies for a wide range of space missions, including drag compensation in low Earth orbit, stationkeeping, and orbital insertion, as access to space becomes more affordable. Although anomalous electron transport, the electron drift instability (EDI), and secondary electron emission (SEE) have been studied experimentally and numerically in xenon-based HETs, the impact of alternative propellants is still poorly characterized. In this work, a two-dimensional particle-in-cell/Monte Carlo collision (PIC/MCC) code is used to model the (r − θ) plane of a HET operated separately with four different noble gases: xenon, krypton, argon, and helium. Models for electron induced secondary electron emission (SEE) and dielectric walls are implemented in order to investigate the coupling between the propellant choice and the radial thruster walls. For all conditions and propellants studied, an EDI and enhanced electron cross-field transport are observed. The frequency of the instability, as well as the electron mobility, are compared with analytical expressions from a recently developed kinetic theory. Confirming this theory, it is shown that while the frequency of the EDI depends on the propellant mass, the electron mobility appears to be almost independent of the propellant choice.

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“…Analytical expressions of the h factor were determined for each regime of pressure [10], such that general heuristic formulas can now be used for industrial applications and experiments [11,12]. Recently, the authors have proposed a heuristic formula for the h factor in two-dimensional (2D) non-magnetized plasma [13] h 0 = 0.55 3 + 0.5…”

Section: Introductionmentioning

confidence: 99%

Saturation of the magnetic confinement in weakly ionized plasma

Lucken

Tavant

Bourdon

et al. 2020

Plasma Sources Sci. Technol.

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Plasma transport in magnetized discharges is a long-standing problem because it strongly depends on instabilities whose properties and influence on the plasma transport are difficult to predict. A magnetized plasma column is investigated with 2D PIC simulations in the plane transverse to the magnetic field, at gas pressures between 3 and 12 mTorr and magnetic field intensities between 0 and 40 mT. At high magnetic field, instabilities develop and rotate in the diamagnetic drift direction. It is shown theoretically and by simulation that the magnetic field confinement is destroyed by the instability. Predictive formulas of the main parameters of the instability-enhanced plasma transport such as the edge-to-center plasma density ratio (or h factor), and the effective collision frequency are provided and successfully compared with the PIC simulations.

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Edge-to-center plasma density ratios in two-dimensional plasma discharges

Cited by 8 publications

References 20 publications

Physics of E × B discharges relevant to plasma propulsion and similar technologies

Physics of E × B discharges relevant to plasma propulsion and similar technologies

The effect of alternative propellants on the electron drift instability in Hall-effect thrusters: Insight from 2D particle-in-cell simulations

Saturation of the magnetic confinement in weakly ionized plasma

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