Mainz 1997 – wissenschaftliches Programm

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P: Plasmaphysik

P 13: Postersitzung I

P 13.69: Poster

Dienstag, 4. März 1997, 16:00–18:00, Foyer

Gasmixing and Plasma Stability in an ECR Discharge — •Dirk Meyer¹, Denis Bolshukhin¹, Klaus Wiesemann¹, Thomas Daube², and Holger Schmitz² — ¹Experimentalphysik insbes. Gaselektronik, Ruhr-Universität Bochum, 44780 Bochum — ²Lehrstuhl f. Theoretische Physik I, Ruhr-Universität Bochum, 44780 Bochum

In electron-cyclotron-resonance (ECR) ion sources it was found that adding a light gas to the heavier discharge gas results in general in a significant increase of high charge state production and in an improvement of source conditions and plasma stability. In our simple magnetic mirror device we found clear evidence that this gasmixing effect is an effect of stabilizing the plasma against instabilities. In pure nitrogen we observed an instability occuring with a repetition rate of about 2Hz which is almost suppressed when running the discharge with admixtures of He.

New experiments have shown that one aspect of the stabilizing action of He admixtures is the suppression of selfenhanced sputtering of wall material (Cu).

A scenario for the developement of the observed instability will be presented as well as first results of simulations of the selfenhanced Cu sputtering yields.