ON EFFECTS OF A LOCAL PLASMA-DENSITY GROWTH DUE TO PONDEROMOTIVE FORCES AT FAST-WAVE LAUNCHING IN TOKAMAKS

Nonlinear changes of the reflection coefficient are computed at fast w ave launching by a waveguide array; namely, the case of an eventual fa st wave experiment on the FTU tokamak is considered. In the case of lo w plasma density gradients, the reflection coefficient may significant ly change at the wave power in the range of several kilowatts per cent imetre square because of the ponderomotive force effects.