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

Journal Article · Mon Mar 01 00:00:00 EST 1982 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.863762· OSTI ID:5780323

Frieman, E A; Chen, L

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 magnetic 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 scheme, 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.

• Research Organization: Princeton Unv., NJ
• OSTI ID: 5780323
• Journal Information: Phys. Fluids; (United States), Vol. 25:3
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA
TURBULENCE
PLASMA CONFINEMENT
NONLINEAR PROBLEMS
ALFVEN WAVES
DAMPING
ELECTROMAGNETIC RADIATION
MAGNETIC FIELD CONFIGURATIONS
PLASMA HEATING
TOKAMAK DEVICES
CLOSED PLASMA DEVICES
CONFINEMENT
HEATING
HYDROMAGNETIC WAVES
RADIATIONS
THERMONUCLEAR DEVICES
700108* - Fusion Energy- Plasma Research- Wave Phenomena