Carbon deposition at the bottom of gaps in TEXTOR experiments

D. Matveev, A. Kirschner, H. G. Esser, M. Freisinger, A. Kreter, O. Van Hoey, D. Borodin, A. Litnovsky, P. Wienhold, J. W. Coenen, H. Stoschus, V. Philipps, S. Brezinsek, G. Van Oost

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Results of a new dedicated experiment addressing the problem of impurity deposition at the bottom in gaps are presented along with modelling. A test limiter with an isolated gap was exposed to the scrape-off layer plasma in TEXTOR. The exposure was accompanied by injection of 13C-marked methane in the vicinity of the gap. Deposition at the bottom of the gap was monitored in situ with Quartz-Microbalance diagnostics. The 13C deposition efficiency of about 2.6 × 10 5 was measured. Post mortem analysis of resulting deposited layers performed with SIMS and EPMA techniques yields about a factor 2 smaller value corresponding to approximately 10% contribution of the gap bottom to the total 13C deposition in the gap. This measured contribution is effectively much smaller than observed earlier in TEXTOR, taking the difference in geometry into account, and is in reasonable agreement with modelling performed with ERO and 3D-GAPS codes.

Original languageEnglish
Pages (from-to)S775-S779
JournalJournal of Nuclear Materials
Issue numberSUPPL
StatePublished - 2013
Externally publishedYes

Bibliographical note

Funding Information:
This work is supported by the Research Fund of Ghent University (BOF), Belgium. EPMA measurements were done at the Central Facility for Electron Microscopy (Gemeinschaftslabor für Elektronenmikroskopie – GFE) at RWTH Aachen.


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