Chemical impurity production under boronised wall conditions in TEXTOR
The TEXTOR sniffer probe has been used to analyse the chemical impurity production under various plasma and boronised wall conditions. Methane formation was observed to be 0.6-1 x 1.0 E-2 CH(4)/H at room temperature, increasing slightly with increasing density in the SOL. The hydrocarbon formation yields increased from R.T. to the maximum at about 500 C by a factor of 1.5-2.5. Increasing the impact energy by biasing the graphite plate led to a decrease of the hydrocarbon yield at room temperature but to an increase at 500 C. Chemical CO formation due to interaction of oxygen impurities with the graphite reaches ratios between 0.5 and 3 x 1.0 E-2 CO/H,D increasing with increasing distance to the limiter edge.
Bibliographic Reference: Article: Proceedings of the 19th Conference on Controlled Fusion and Plasma Physics, Vol. 2 (1992) pp. 827-830
Record Number: 199211302 / Last updated on: 1994-11-29
Original language: en
Available languages: en