This paper concerns the study of the development of turbulence in a toroidal magnetoplasma [C. Riccardi et al., Plasma Phys. 36, 1791 (1994)]. This analysis has been performed by evaluating wave number, frequency spectra, and bicoherence coefficients of density fluctuations associated to drift wave propagation. Plasma parameters have been changed over a wide range, in order to identify and characterize density fluctuations both in absence and in presence of nonlinear phenomena.

An experimental investigation of ion and electron resonance cones have been carried out in the toroidal device Thorello in which a weakly magnetized plasma is produced. As resonance cones propagation depends on fundamental parameters of plasma, we can estimate density, temperature, magnetic field and ion minority concentration. In this way the investigation aims to develop some plasma diagnostics comparable to the other methods

An experimental and theoretical study on ion resonance cones has been carried out taking into account both thermal and source effects. The measurements have been performed in a small toroidal device, with different antenna systems to excite the waves.

No abstract

No abstract