Plasma Physics and Controlled Fusion · 2005 · 118 citations · 20 references
Natural SciencesPhysicsAcousticsFluid DynamicsPlasma PhysicsMagnetized PlasmaPlasma ConfinementPlasma StabilityPlasma TurbulenceTurbulenceTurbulent FlowEnergy Dispersion RelationShearingTokamak ConfinementTokamak PhysicsTokamak PlasmasTurbulence In High-temperature PlasmasTurbulence In Magnetized PlasmasViscosity
The instability of the geodesic acoustic mode (GAM) in tokamak turbulence is analyzed. It can be induced by dynamic shearing of the ambient turbulence by GAMs combined with the poloidal inhomogeneity of the turbulent flux. The dispersion relation is derived. The competition of the drive mechanism and the damping by turbulence viscosity is discussed. The GAMs are more unstable for high safety factors.
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