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Kinetic Electron Closures for Electromagnetic Simulation of Drift and Shear-Alfven Waves (II).

DE200415006149

Publication Date	2001
Personal Author	Cohen, B. I.; Dimits, A. M.; Nevins, W. M.; Chen, Y.; Parker, S.
Page Count	38
Abstract	An electromagnetic hybrid scheme (fluid electrons and gyrokinetic ions) is elaborated in example calculations and extended to toroidal geometry. The scheme includes a kinetic electron closure valid for(beta)(sub e)>; m(sub e)/m(sub i) ((beta)(sub e) is the ratio of the plasma electron pressure to the magnetic field energy density). The new scheme incorporates partially linearized ((delta)f) drift-kinetic electrons whose pressure and number density moments are used to close the fluid momentum equation for the electron fluid (Ohm's law). The test cases used are small-amplitude kinetic shear-Alfven waves with electron Landau damping, the ion-temperature-gradient instability, and the collisionless drift instability (universal mode) in an unsheared slab as a function of the plasma(beta)(sub e). Attention is given to resolution and convergence issues in simulations of turbulent steady states.
Keywords	Alfven waves Plasma drift Magnetic fields Kinetics Electrons Drift instability Instability Resolution Convergence Steady state Turbulence Ions Electromagnetic simulation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200413

Kinetic Electron Closures for Electromagnetic Simulation of Drift and Shear-Alfven Waves (II).

Kinetic Electron Closures for Electromagnetic Simulation of Drift and Shear-Alfven Waves (II).
DE200415006149

Publication Date	2001
Personal Author	Cohen, B. I.; Dimits, A. M.; Nevins, W. M.; Chen, Y.; Parker, S.
Page Count	38
Abstract	An electromagnetic hybrid scheme (fluid electrons and gyrokinetic ions) is elaborated in example calculations and extended to toroidal geometry. The scheme includes a kinetic electron closure valid for(beta)(sub e)>; m(sub e)/m(sub i) ((beta)(sub e) is the ratio of the plasma electron pressure to the magnetic field energy density). The new scheme incorporates partially linearized ((delta)f) drift-kinetic electrons whose pressure and number density moments are used to close the fluid momentum equation for the electron fluid (Ohm's law). The test cases used are small-amplitude kinetic shear-Alfven waves with electron Landau damping, the ion-temperature-gradient instability, and the collisionless drift instability (universal mode) in an unsheared slab as a function of the plasma(beta)(sub e). Attention is given to resolution and convergence issues in simulations of turbulent steady states.
Keywords	Alfven waves Plasma drift Magnetic fields Kinetics Electrons Drift instability Instability Resolution Convergence Steady state Turbulence Ions Electromagnetic simulation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200413