skip to main content

Title: Nonlinear gyrokinetic equations for low-frequency electromagnetic waves in general plasma equilibria

A nonlinear gyrokinetic formalism for low-frequency (less than the cyclotron frequency) microscopic electromagnetic perturbations in general magnetic field configurations is developed. The nonlinear equations thus derived are valid in the strong-turbulence regime and contain effects due to finite Larmor radius, plasma inhomogeneities, and magentic field geometries. The specific case of axisymmetric tokamaks is then considered, and a model nonlinear equation is derived for electrostatic drift waves. Also, applying the formalism to the shear Alfven wave heating sceme, it is found that nonlinear ion Landau damping of kinetic shear-Alfven waves is modified, both qualitatively and quantitatively, by the diamagnetic drift effects. In particular, wave energy is found to cascade in wavenumber instead of frequency.
Authors:
;
Publication Date:
OSTI Identifier:
6005798
Report Number(s):
PPPL-1834
ON: DE82002290; TRN: 82-001376
DOE Contract Number:
AC02-76CH03073
Resource Type:
Technical Report
Research Org:
Princeton Univ., NJ (USA). Plasma Physics Lab.
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EQUILIBRIUM PLASMA; ELECTROMAGNETIC RADIATION; KINETIC EQUATIONS; INHOMOGENEOUS PLASMA; ALFVEN WAVES; LARMOR RADIUS; NONLINEAR PROBLEMS; EQUATIONS; HYDROMAGNETIC WAVES; PLASMA; RADIATIONS 700107* -- Fusion Energy-- Plasma Research-- Instabilities