A Landau fluid model for electromagnetic plasma microturbulence

Citation
Pb. Snyder et Gw. Hammett, A Landau fluid model for electromagnetic plasma microturbulence, PHYS PLASMA, 8(7), 2001, pp. 3199-3216
Citations number
57
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
7
Year of publication
2001
Pages
3199 - 3216
Database
ISI
SICI code
1070-664X(200107)8:7<3199:ALFMFE>2.0.ZU;2-Q
Abstract
A fluid model is developed for the description of microturbulence and trans port in magnetized, long mean-free-path plasmas. The model incorporates bot h electrostatic and magnetic fluctuations, as well as finite Larmor radius and kinetic effects. Multispecies Landau fluid equations are derived from m oments of the electromagnetic gyrokinetic equation, using fluid closures wh ich model kinetic effects. A reduced description of electron dynamics, appr opriate for the study of microturbulence on characteristic ion drift and Al fven scales, is derived via an expansion in the electron to ion mass ratio. The reduced electron equations incorporate curvature, delB, and linear and nonlinear ExB drift effects, needed to model the electron contribution to the drive and damping of ion gyroradius scale instabilities in tokamaks. Th e Landau fluid model is linearly benchmarked against gyrokinetic codes, and found to reproduce the toroidal finite beta ion temperature gradient and k inetic ballooning instabilities. (C) 2001 American Institute of Physics.