This title appears in the Scientific Report :
2008
Please use the identifier:
http://dx.doi.org/10.1088/0741-3335/50/9/095008 in citations.
Effect of surface roughness and substrate material on carbon deposition in tokamak TEXTOR
Effect of surface roughness and substrate material on carbon deposition in tokamak TEXTOR
The technique of (CH4)-C-13 tracer injection through test limiters was applied to study the influence of surface roughness and substrate material on the local C-13 deposition. Spherically shaped graphite limiters with integrated gas injection were prepared with two different grades of surface roughn...
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Personal Name(s): | Kreter, A. |
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Brezinsek, S. / Hirai, T. / Kirschner, A. / Mayer, M. / Philipps, V. / Pospieszczyk, A. / Samm, U. / Schmitz, O. / Schweer, B. / Sergienko, G. / Sugiyama, K. / Tanabe, T. / Ueda, Y. / Wienhold, P. | |
Contributing Institute: |
Plasmaphysik; IEF-4 JARA-ENERGY; JARA-ENERGY |
Published in: | Plasma physics and controlled fusion, 50 (2008) S. 095008 |
Imprint: |
Bristol
IOP Publ.
2008
|
Physical Description: |
095008 |
DOI: |
10.1088/0741-3335/50/9/095008 |
Document Type: |
Journal Article |
Research Program: |
Fusion |
Series Title: |
Plasma Physics and Controlled Fusion
50 |
Subject (ZB): | |
Publikationsportal JuSER |
The technique of (CH4)-C-13 tracer injection through test limiters was applied to study the influence of surface roughness and substrate material on the local C-13 deposition. Spherically shaped graphite limiters with integrated gas injection were prepared with two different grades of surface roughness, similar to 0.1 and similar to 1 mu m. In addition, tungsten limiters with a roughness of similar to 0.1 mu m were used to study the substrate material effect. The limiters were exposed to the SOL plasma for two discharge scenarios, Ohmic and neutral beam heated. The C-13 deposition efficiency-the ratio of the locally deposited to the injected amount of C-13-and the deposition pattern were evaluated by post-mortem surface analysis. Surface roughness has a pronounced effect and increases the C-13 deposition efficiency on graphite with rougher surface by a factor of 3-5 compared with smoother graphite. On tungsten a factor of 2-4 less carbon is deposited than on graphite with similar surface roughness. A systematically higher amount of C-13 (by a factor 1.5-2.5) was deposited on limiters exposed to Ohmic compared with neutral beam heated plasmas. |