In-situ measurements of carbon and deuterium deposition using the fast reciprocating probe in TEXTOR

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• 作者：B. Emmoth ; A. Kreter ; A. Hallé ; n ; M. Jakubowski ; M. Lehnen ; A. Litnovsky ; P. Petersson ; V. Philipps ; G. Possnert ; M. Rubel ; B. Schweer ; P. Sundelin ; B. Unterberg ; P. Wienhold ; TEXTOR team
• 刊名：Journal of Nuclear Materials
• 出版年：2009
• 出版时间：15 June 2009
• 年：2009
• 卷：390-391
• 期：Complete
• 页码：179-182
• 全文大小：308 K

文摘

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.