Analyses of ICRF waves on JET plasmas

Theoretical and computational study of ICRF waves has been carried out for JET plasmas. Present experimental parameters are analysed and some prediction study for future experiments are carried out by combination use of two kinetic codes. The wave field is solved for obtaining the power deposition profile of each plasma species and the antenna impedance. Two-ion hybrid case is simulated. Strong minority heating in central core region is observed and the direct input to electrons is found at most 10% of the total absorption. However, for the higher temperature target plasma, the deposition profile to electrons becomes broader and off-central and its input reaches approx. 30%. Efficient non-central deposition to ions by combined use of NBI is also discussed. Global coupling study is also carried out for cold plasma with dampings. (author)