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

Cohen, B. I. ; Dimits, A. M. ; Nevins, W. M. ; Chen, Y. ; Parker, S.

Technical Information Center Oak Ridge Tennessee

关键词: Alfven waves;    Plasma drift;    Magnetic fields;    Kinetics;    Electrons;   

RP-ID  :  DE200415006149

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

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.