Magnetic presheath in a weakly turbulent multicomponent plasma

Journal Article · Mon Jan 15 04:00:00 EST 2007 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2428278· OSTI ID:20960125

Stanojevic, Mladen; Duhovnik, Joze; Jelic, Nikola; Kuhn, Siegbert ^[1]

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1. LECAD Laboratory, Faculty of Mechanical Engineering, University of Ljubljana, Askerceva Str. 6, SI-1000 Ljubljana (Slovenia)

A fluid model of the magnetic presheath in a weakly turbulent multicomponent plasma consisting of electrons and several positive ion components is presented. Turbulent particle source terms in the continuity equations and turbulent momentum source terms in the momentum balance equations for the ion components are derived from basic principles [Plasma Phys. Controlled Fusion 47, 685 (2005)], i.e., by means of the ensemble averaging procedure from the statistical theory of plasma turbulence. Then the unknown correlations between the fluctuating quantities occurring in the turbulent source terms derived are replaced with phenomenological expressions based on analogy with classical transport. The remaining correlation terms in the momentum balance equations, which are responsible for explicit coupling of the equations for different ion components, reduce to the corresponding classical terms when the turbulent transport corrections are negligible (i.e., for ''quiescent'' plasmas). Under certain conditions regarding the nature of the boundary plasma turbulence, the analysis of the planar magnetic presheath performed in this study yields results for the ion component fluid velocities and particle flux densities at the magnetic presheath entrance that are directly applicable to the boundary conditions of multifluid plasma transport and turbulence codes. A fluid formulation of the Bohm criterion, valid for weakly turbulent multicomponent plasmas as treated in this study, is also derived.

• OSTI ID: 20960125
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 1 Vol. 14; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BOHM CRITERION
BOUNDARY CONDITIONS
BOUNDARY LAYERS
CATIONS
CONTINUITY EQUATIONS
CORRECTIONS
CORRELATIONS
ELECTRONS
FLUCTUATIONS
FLUIDS
FLUX DENSITY
PARTICLE SOURCES
PLASMA DENSITY
PLASMA SHEATH
PLASMA SIMULATION
QUIESCENT PLASMA
SOURCE TERMS
STATISTICAL MODELS
TURBULENCE