ICRF results on TFR at megawatt power levels

Experiments on plasma heating by RF in the ion cyclotron range of frequency have been performed in TFR at power levels between 1 and 2 MW. In a deuterium plasma containing 20% hydrogen at an average electron density of 10 14 cm -3 , 1.3 MW delivered by the generator for 50 ms leads to an increase of the central temperature of 0.8 keV for the ions, 0.5 KeV for the electrons. High power, up to 2.2 MW, was applied for 20 ms, this raising the ion temperature up to 2 keV with a corresponding neutron emission reaching 2.10 12 s -1 . Decay of the electron, and to a lesser extent of the ion temperatures, is observed after 20-30 ms RF. An important increase of radiation from metallic ions seems to play a major role in this evolution of the temperature during the RF pulse.