On the electron drift velocity in plasma devices with E×B drift

Chapurin, Oleksandr; Smolyakov, Andrei

doi:10.1063/1.4954994

Cited by 16 publications

(9 citation statements)

References 23 publications

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“…Chapurin and Smolyakov [40] showed that the full expression for the fluid (averaged) drift can be written as the sum of the E × B drift, diamagnetic drift, and pressure anisotropy drift. We shall refer to this velocity as v net .…”

Section: Temporal Variation Of Electron Properties: Arcondition 1 (Pe...mentioning

confidence: 99%

Dynamic features of the electron drift and electron properties in a HiPIMS discharge

Dubois¹,

Tsikata²,

Minea³

2022

Plasma Sources Sci. Technol.

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Information on the evolution of electron properties during High-Power Impulse Magnetron Sputtering (HiPIMS) operation of planar magnetrons enables the study of fundamental physical processes. In this work, incoherent Thomson scattering is implemented for the non-invasive, spatiotemporally-resolved characterization of electron properties and drifts in the HiPIMS regime of a planar magnetron. In the ionization region of argon and helium plasmas, the azimuthal electron drifts are directly measured perpendicular to the magnetic field and are found to evolve according to a changing balance of E x B and diamagnetic electron drifts, while radial electron drifts, measured parallel to the magnetic field, can be attributed to plasma expansion/contraction and centrifugal forces. The evolution of electron density and temperature in the afterglow plasma phase show the existence of two time scales for the variation of plasma properties. These characterizations provide detailed information on electron properties and dynamics in regions of the magnetic trap ordinarily inaccessible to invasive diagnostics.

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Section: Temporal Variation Of Electron Properties: Arcondition 1 (Pe...mentioning

confidence: 99%

Dynamic features of the electron drift and electron properties in a HiPIMS discharge

Dubois¹,

Tsikata²,

Minea³

2022

Plasma Sources Sci. Technol.

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“…The fact that the measured drift is of nearly the same magnitude regardless of the magnetic field direction suggests that the   É B drift dominates the diamagnetic and curvature drifts near the exit plane. This observation might differ at distances further downstream [69]. The maximum electron drift velocity can be used to estimate the maximum electric field in the acceleration region of the thruster.…”

Section: Magnetic Field Directionmentioning

confidence: 99%

Incoherent Thomson scattering measurements of electron properties in a conventional and magnetically-shielded Hall thruster

Vincent

Tsikata

Mazouffre

2020

Plasma Sources Sci. Technol.

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Reliable measurements of electron properties are key for the validation of simulations of Hall thrusters and similar plasma sources. In this paper, a recently-developed incoherent Thomson scattering diagnostic is successfully applied to electron property measurement in a low-power Hall thruster discharge. Investigations of electron properties along radial and azimuthal directions in both conventional and magnetically-shielded architectures are performed. The high diagnostic sensitivity gives access to electron property measurements in a plasma environment with densities as low as 10 16 m −3 . Electron temperatures reaching several tens of eV and drift velocities on the order of 10 6 m s −1 are measured in the exit plane region. The impact of the magnetic field (intensity and direction) and discharge voltage are investigated.

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“…Consistent with the gyrokinetic modelling, the field's magnitude, B, decreases over the major radius of the torus (B ∝ 1/R), and κ = − R/R. Curvature drifts are encoded via diamagnetism in this fluid representation [65] with the curvature operator, (17) but with an unperturbed field vector distinguishing it from electromagnetic theory. The constant coefficients κ s and η s correspond to parallel thermal conductivity and electrical resistivity, respectively.…”

Section: Machine Learning Fluid Theorymentioning

confidence: 67%

Turbulent field fluctuations in gyrokinetic and fluid plasmas

Mathews,

Mandell,

Francisquez

et al. 2021

Preprint

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A key uncertainty in the design and development of magnetic confinement fusion energy reactors is predicting edge plasma turbulence. An essential step in overcoming this uncertainty is the validation in accuracy of reduced turbulent transport models. Drift-reduced Braginskii two-fluid theory is one such set of reduced equations that has for decades simulated boundary plasmas in experiment, but significant questions exist regarding its predictive ability. To this end, using a novel physics-informed deep learning framework, we demonstrate the first ever direct quantitative comparisons of turbulent field fluctuations between electrostatic two-fluid theory and electromagnetic gyrokinetic modelling with good overall agreement found in magnetized helical plasmas at low normalized pressure. This framework is readily adaptable to experimental and astrophysical environments, and presents a new technique for the numerical validation and discovery of reduced global plasma turbulence models.

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On the electron drift velocity in plasma devices with E×B drift

Cited by 16 publications

References 23 publications

Dynamic features of the electron drift and electron properties in a HiPIMS discharge

Dynamic features of the electron drift and electron properties in a HiPIMS discharge

Incoherent Thomson scattering measurements of electron properties in a conventional and magnetically-shielded Hall thruster

Turbulent field fluctuations in gyrokinetic and fluid plasmas

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