Collisionless dissipation of the toroidicity-induced Alfven eigenmodes in elongated tokamaks by the trapped and untrapped electrons

The parallel dielectric permittivity elements of a toroidal collisionless p lasma with elliptic magnetic surfaces are analyzed for waves in the frequen cy range of the toroidicity-induced Alfven eigenmodes (TAEs). The dielectri c characteristics are derived by serving the drift-kinetic equation of the trapped and untrapped particles in tokamaks with large aspect ratio and sma ll elongation. The dissipated power of the Alfven waves is expressed by the summation of terms including the non-diagonal elements of the parallel per mittivity. Estimations of the TAEs electron Landau damping are carried out for the JET-plasma parameters.