JET-P(95)32
Alfven Eigenmode Excitation by ICRH Beat-Waves
The resonant excitation of Alfvén Eigcnmodes by ICRH beat waves has been attempted experimentally on JET tokamak plasmas. Toroidicity induced AE are excited when the difference frequency between two ICRH antennas is of the order of the central frequency of the relative Alfvén continuum gap. The relatively large amplitudes for the T AE driven by ICRH beat waves suggest that this new non-linear excitation mechanism could allow investigations into the effects of AE on particle orbits and should be taken into account in ICRH heated thermonuclear plasmas.