Non-isothermal sheath model for low pressure plasmas

Tavant, Antoine; Lucken, Romain; Bourdon, Anne; Chabert, Pascal

doi:10.1088/1361-6595/ab279b

Cited by 7 publications

(18 citation statements)

References 34 publications

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“…It was also shown using PIC simulations that the average energy (or effective temperature) of the electrons decays in the sheath due to the non-Maxwellian distribution functions mentioned above. Therefore, the usual isothermal sheath theories used to evaluate the sheath potential drop and the secondary emission yield are not correct [24], [25]. A polytropic sheath model has been proposed to overcome the limitation of isothermal models.…”

Section: Plasma Wall Interaction In E×b Discharges Relevant To Plasma...mentioning

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: Plasma Wall Interaction In E×b Discharges Relevant To Plasma...mentioning

confidence: 99%

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

et al. 2020

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“…The re-injection of particles however has to be handled carefully. For example, Tavant [29] showed that the use of a virtual axial model with random position re-injection effectively results in large numerical instabilities, which can dramatically impact the simulation results. This drawback has already been observed in 1D-azimuthal simulations [10,30,31].…”

Section: Introductionmentioning

confidence: 99%

2D radial-azimuthal particle-in-cell benchmark for E × B discharges

Villafana

Petronio

Denig

et al. 2021

Plasma Sources Sci. Technol.

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In this paper we propose a representative simulation test-case of E × B discharges accounting for plasma wall interactions with the presence of both the Electron Cyclotron Drift Instability (ECDI) and the Modified-Two-Stream-Instability (MTSI). Seven independently developed Particle-In-Cell (PIC) codes have simulated this benchmark case, with the same specified conditions. The characteristics of the different codes and computing times are given. Results show that both instabilities were captured in a similar fashion and good agreement between the different PIC codes is reported as main plasma parameters were closely related within a 5% interval. The number of macroparticles per cell was also varied and statistical convergence was reached. Detailed outputs are given in the supplementary data, to be used by other similar groups in the perspective of code verification.

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“…The Particle-in-cell method combined with Monte Carlo type treatment of the collision processes (PIC/MCC) [24][25][26][27][28][29][30][31][32][33][34][35] has been an important approach in the studies of a wide variety of phenomena in CCPs. The discharge models used in PIC/MCC simulations usually adopt several assumptions related to the description of the interaction of plasma species with the boundary surfaces.…”

Section: Introductionmentioning

confidence: 99%

Surface processes in low-pressure capacitive radio frequency discharges driven by tailored voltage waveforms

Derzsi¹,

Horvath²,

Schulze³

2020

Plasma Sources Sci. Technol.

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Particle-in-cell/Monte Carlo collisions (PIC/MCC) simulations are performed to investigate the sputtering and the secondary electron emission (SEE) in geometrically symmetric capacitively coupled Ar discharges with Cu electrodes driven by tailored voltage waveforms (TVWs). The driving voltage waveform is composed of multiple consecutive harmonics (1 N 4) of the fundamental frequency (13.56 MHz) and is tailored by adjusting the identical phases (θ) of the even harmonics. The simulations are based on a discharge model in which realistic approaches are implemented for the description of the SEE induced by electrons and heavy-particles at the electrodes, as well as for the sputtering of the electrodes by heavy-particles. In case of applying a single frequency, the voltage amplitude is varied (250 V φ 1 2500 V), while in case of applying multi-frequency TVWs, N and θ are varied at a fixed total voltage amplitude (φ tot = 1000 V) at a low pressure of 0.5 Pa. By applying more than one harmonic to drive the discharge, the mean energy of Ar + ions and fast Ar atoms at the electrodes can be controlled by changing the phase angles. Due to the dependence of the sputtering yield on the heavy-particle energies, the flux of sputtered atoms can as well be controlled by the phase angles at both electrodes. The domain over which the sputtered atom flux can be varied is enlarged by adding more harmonics to the driving voltage waveform. For all conditions investigated, electron induced SEs (δ-electrons) induce strong ionization in the α-mode and dominate the ionization dynamics at high voltage amplitudes.

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Non-isothermal sheath model for low pressure plasmas

Cited by 7 publications

References 34 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

2D radial-azimuthal particle-in-cell benchmark for E × B discharges

Surface processes in low-pressure capacitive radio frequency discharges driven by tailored voltage waveforms

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