Reduced entropic model for studies of multidimensional nonlocal transport in high-energy-density plasmas

Journal Article · Sat Aug 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4926824· OSTI ID:22490067

Del Sorbo, D.; Feugeas, J. -L.; Nicolaï, Ph.; Olazabal-Loumé, M.; Dubroca, B.; Guisset, S.; Touati, M.; Tikhonchuk, V. ^[1]

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1. Centre Lasers Intenses et Applications, Université de Bordeaux-CNRS-CEA, UMR 5107, F-33405 Talence (France)

Hydrodynamic simulations of high-energy-density plasmas require a detailed description of energy fluxes. For low and intermediate atomic number materials, the leading mechanism is the electron transport, which may be a nonlocal phenomenon requiring a kinetic modeling. In this paper, we present and test the results of a nonlocal model based on the first angular moments of a simplified Fokker-Planck equation. This multidimensional model is closed thanks to an entropic relation (the Boltzman H-theorem). It provides a better description of the electron distribution function, thus enabling studies of small scale kinetic effects within the hydrodynamic framework. Examples of instabilities of electron plasma and ion-acoustic waves, driven by the heat flux, are presented and compared with the classical formula.

• OSTI ID: 22490067
• Journal Information: Physics of Plasmas, Vol. 22, Issue 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATOMIC NUMBER
DISTRIBUTION FUNCTIONS
ELECTRON TRANSFER
ELECTRONS
ENERGY DENSITY
FOKKER-PLANCK EQUATION
H THEOREM
HEAT FLUX
ION ACOUSTIC WAVES
PLASMA
PLASMA INSTABILITY
SIMULATION