Linearized gyrofluid model of the alpha-destabilized toroidal Alfven eigenmode with continuum damping effects
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8071 (United States)
The toroidicity-induced shear Alfven eigenmode (TAE) can be destabilized by energetic particle populations through inverse Landau damping. It may also be significantly damped by coupling with adjacent shear Alfven continua. A gyrofluid model with Landau closure that includes both of these effects is developed and applied to this instability. The model consists of the usual reduced magnetohydrodynamic (MHD) equations for the evolution of the poloidal flux and toroidal component of vorticity, coupled with equations for the density and parallel velocity moments of the energetic species. The latter two equations include Landau damping/growth effects through use of a consistent closure relation, which is equivalent to a two-pole approximation to the plasma dispersion function. These equations are solved numerically using a three-dimensional initial value code (TAEFL) in toroidal geometry. The unstable TAE growth rate and continuum damping rates are compared with recent analytical estimates, and reasonable agreement is obtained.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 7153449
- Journal Information:
- Physics of Fluids B; (United States), Vol. 4:10; ISSN 0899-8221
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALFVEN WAVES
LANDAU DAMPING
COMPUTER CODES
MAGNETOHYDRODYNAMICS
NUMERICAL SOLUTION
PLASMA CONFINEMENT
TOKAMAK DEVICES
TOROIDAL CONFIGURATION
ANNULAR SPACE
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
CONFINEMENT
DAMPING
FLUID MECHANICS
HYDRODYNAMICS
HYDROMAGNETIC WAVES
MAGNETIC FIELD CONFIGURATIONS
MECHANICS
SPACE
THERMONUCLEAR DEVICES
700340* - Plasma Waves
Oscillations
& Instabilities- (1992-)