Experiments at the lower hybrid frequency in the Wega tokamak

Application of HF-power near the lower hybrid frequency to the Wega tokamak plasma results in typical bulk ion temperature increases of 20 to 30%,(80 kW). As no indication of electron heating or the production of superthermal electrons by the HF is found, it is probable that a large portion of the energy goes into the observed fast ions, produced at the edge and lost before thermalizing. Under not yet reproduced conditions, an increase by a factor 2 in the perpendicular ion temperature measured only by charge exchange has been found. (author)