INTERACTION OF LOWER-HYBRID WAVES WITH FAST IONS IN JET

Different diagnostic information has been employed in JET to identify the level of interaction between lower hybrid waves and fast ions accelerated up to few MeV by ion cyclotron waves. It is found that up to 25% of the lower hybrid power can be absorbed by fast ions under specific plasma conditions. Fourier analysis of neutron emission rates and fast ion energy signals during lower hybrid modulation experiments show that the level of interaction depends on the relative position of the cyclotron resonance and the lower hybrid absorption layers.