Kinetic Alfven eigenmodes in a hot tokamak plasma
Kinetic effects such as finite ion Larmor excursions and resonant Landau interactions are studied in the toroidicity Alfven eigenmode (TAE) range of frequencies. A new Alfven mode conversion mechanism is described taking place away from the resonances through toroidal mode coupling. It generates a group of kinetic Alfven eigenmodes (KAE) in the neighbourhood of each fluid eigenmode, with wavefields that extend throughout the plasma radius and could lead to substantial a particle losses. Comparisons carried out with measurements from the JET tokamak show that the multiple peaks observed on the response are KAE-induced in the neighbourhood of an elongation-induced Alfven eigenmode.