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.
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).
This article describes the use of Langmuir probes to measure plasma parameters in low density, low temperature plasmas with a strong applied magnetic field. The experiment has been performed at the Physics Department of Milan’s University on the steady-state toroidal machine “Thorello.” Results have been analyzed by taking into account instrumental and ionic sheath effects. Finally, experimental results have been compared with direct measurements of the electron distribution function in Thorello.
A variable phase-shifting system, able to generate phase-shifted replicas of the same reference input signal, has been designed to properly feed the antenna system within a plasma device. The system is based on a phase-locked loop used as a voltage controlled phase shifter and is able to provide four phase-shifted output signals. The phase differences between adjacent outputs can be varied between 0° and 100°, and are maintained equal to each other, with a precision of less than 3° in the range 2.5–10 MHz.
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