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P: Plasmaphysik

P 8: Magnetic Confinement and Plasma Technology (Poster Session)

P 8.14: Poster

Monday, April 2, 2001, 12:30–15:00, AT2

Heating scenario in a linear magnetized ECR mirror device — •Ulrich Wolters, Dirk Meyer, and Klaus Wiesemann — Experimentalphysik inbes. Gaselektronik, Ruhr-Universität Bochum, D-44780 Bochum

In the past different authors have studied intensely the necessity of phase randomization during ECR heating in a magnetic mirror within the single particle approximation. The excitation of parametric instabilities introduces another system of wave particle interactions. Collective motions imply a different mechanism of phase mixing with time scales close to the inverse growth rate of a modulational instability, the characteristic time being shorter than the electron bounce frequency in the mirror trap. Measurements on ECR heating show the presence of both spectral broadening of the pump wave as well as low frequency noise close to the lower hybrid frequency. The occurrence of these effects comes together with a density increase in the discharge centre, changing the wave dispersion of several modes, thus leading to a change of the heating scenario of the entire plasma. The aspects of this scenario are discussed.