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P: Plasmaphysik

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

P 8.15: Poster

Montag, 2. April 2001, 12:30–15:00, AT2

First approaches to density profile calculations of an ECR-discharge — •Michael Küll, Ulrich Wolters, and Klaus Wiesemann — Experimentalphysik insbes. Gaselektronik, Ruhr-Universitaet Bochum, D-44780 Bochum

The plasma density distribution of a low-pressure magnetic mirror device (ECR-discharge) is of interest for two reasons. On the one hand the heating scenario changes with the spatial position of the upper hybrid resonance zones, which depends on the plasma density distribution. On the other hand we utilize line-of-sight integrating diagnostics such as microwave interferometry, where the density profile is needed for the evaluation of the plasma parameters. Therefore we developed a two dimensional model for the density distribution within the ECR-discharge based on the first two moments of a Boltzmann type equation. The model separates the different loss processes parallel and perpendicular to the vacuum magnetic field, namely classical-/Bohm diffusion and ionic free fall with electrically conducting walls (Simon short circuit). For the simulation we implemented an ADI-method, alternatively we used a simplification leading to an eigenvalue problem. We will discuss first results and difficulties.