ION-TRANSPORT IN TOKAMAK PLASMAS WITH ION BANANA ORBITS SQUEEZED BY ALFVEN WAVES

Kinetic or slow Alfven waves, which can be driven in a tokamak plasma by mode conversion, were earlier shown to be useful for wave current d rive and plasma heating, for creating reversed shear configurations, a nd for the formation and maintenance of edge and internal transport ba rriers due to their small radial localizations. Kinetic Alfven waves c an also induce radial electric fields and provide a mechanism for sque ezing the banana orbits of ions in weakly collisional plasmas of tokam aks. It is shown that the radial electric field, induced by Alfven wav es, under some conditions has a nonlinear dependence on the radio-freq uency absorbed power. [S0031-9007(98)07433-X].