Abstract
Coating of the walls of TEXTOR with silicon has led to improved tokamak plasma performance. Very low concentrations of C, B, and O are measured. Radiation from silicon is located at the plasma periphery at r/a\ensuremath{\ge}0.75 and decreases with increasing plasma density. Density limits are enhanced by 30% as compared to boronized conditions; large density gradients and low electron temperatures at the edge (10 eV) are obtained. The improved confinement regimes observed earlier at low densities [${\mathrm{\ensuremath{\tau}}}_{\mathit{E}}$=1.7\ifmmode\times\else\texttimes\fi{}ITER L 89-P International Thermonuclear Experimental Reactor)] were extended to significantly higher densities in spite of a high radiative power fraction.
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