Author/Authors :
Emmoth، نويسنده , , B. and Kreter، نويسنده , , A. Duel-Hallen، نويسنده , , A. and Jakubowski، نويسنده , , M. and Lehnen، نويسنده , , M. and Litnovsky، نويسنده , , A. and Petersson، نويسنده , , P. and Philipps، نويسنده , , V. and Possnert، نويسنده , , G. and Rubel، نويسنده , , M. and Schweer، نويسنده , , B. and Sundelin، نويسنده , , P. and Unterberg، نويسنده , , B. and Wienhold، نويسنده , , P.، نويسنده ,
Abstract :
Silicon samples were exposed in the scrape-off layer of the TEXTOR plasma using a fast reciprocating probe, with the aim of studying carbon deposition and deuterium retention during Dynamic Ergodic Divertor (DED) operation. Separate samples were exposed for 300 ms at the flat-top phase of neutral beam heated discharges. The exposure conditions were varied on a shot-to-shot basis by external magnetic perturbations generated by the DED in the m/n = 3/1, DC regime, base configuration. Nuclear Reaction Analysis (NRA) was used to characterise collector sample surfaces after their exposure. Enhanced concentrations of both carbon and deuterium (C 3–10 × 1016 at./cm2, D 8–60 × 1015 at./cm2) were found. The D/C ratio was less than unity which indicates that most of the carbon and deuterium were co-deposited. Carbon e-folding lengths of about 2 cm were found on both toroidal sides of the probe independent of DED perturbations.
