Alfven eigenmode excitation by ICRH beat waves

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