Alfveacuten continuum deformation by kinetic geodesic effect in rotating tokamak plasmas

作者：Elfimov A G^*

来源：Physics of Plasmas, 2010, 17(2): 022102.

DOI：10.1063/1.3299329

• plasma Alfven waves
• plasma instability
• plasma ion acoustic waves
• plasma kinetic theory
• plasma magnetohydrodynamics
• plasma temperature
• plasma toroidal confinement
• Tokamak devices
• Vlasov equation

Using a quasitoroidal set of coordinates with coaxial circular magnetic surfaces, Vlasov equation is solved for collisionless plasmas in drift approach and a perpendicular dielectric tensor is found for large aspect ratio tokamaks in a low frequency band. Taking into account plasma rotation and charge separation parallel electric field, it is found that an ion geodesic effect deform Alfveacuten wave continuum producing continuum minimum at the rational magnetic surfaces, which depends on the plasma rotation and poloidal mode numbers. In kinetic approach, the ion thermal motion defines the geodesic effect but the mode frequency also depends on electron temperature. A geodesic ion Alfveacuten mode predicted below the continuum minimum has a small Landau damping in plasmas with Maxwell distribution but the plasma rotation may drive instability.

• 出版日期2010-2