Efficient radio frequency (rf) heating of a high-density plasma is obtained for any value of the containing magnetostatic field larger than that corresponding to electron cyclotron resonance.

The IBW propagation is experimentally investigated in a steady-state toroidal plasma. IBW is indirectly excited by EPW conversion in lower hybrid resonance layer.I h e phenomenon is analysed in linear conditions, with respect to the relevant plasma parameten, as frequency and density profiles.

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ion minority mncentrations in a w e d y ionized hydrogen plasma are determined through the comparison between the measured wavelength of the neutralized ion Bernstein waves and the theoretical one, given by the solution of the complete electrostatic dispersion relation. A simple model based on the resolution of fluid balance equations permits us to explain the presence of a high percentage of H:The presence of ion impurities' in weakly ionized plasmas is important for explaining the results of various nonlinear plasma-wave experiments, such as parametric decay (Ono et a1 1980) and soliton propagation (Pierre ef a1 1985).