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首页> 外文期刊>Plasma physics and controlled fusion >Effect of surface roughness and substrate material on carbon erosion and deposition in the TEXTOR tokamak
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Effect of surface roughness and substrate material on carbon erosion and deposition in the TEXTOR tokamak

机译：表面粗糙度和基材材料对TEXTOR托卡马克中碳腐蚀和沉积的影响

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摘要

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.
机译：通过测试限幅器注入（CH4）-C-13示踪剂技术研究了表面粗糙度和基底材料对局部C-13沉积的影响。制备了带有集成气体注入的球形石墨限制器，具有两种不同等级的表面粗糙度，分别为0.1和1μm。此外，使用粗糙度近似于0.1微米的钨限制器来研究基材的材料效果。限制器暴露在SOL等离子体中，用于两种放电情况，即欧姆加热和中性束加热。通过事后表面分析来评价C-13沉积效率-局部沉积与C-13注入量之比-以及沉积图案。与较光滑的石墨相比，表面粗糙度具有显着的效果，并使在具有更粗糙表面的石墨上的C-13沉积效率提高了3-5倍。与具有类似表面粗糙度的石墨相比，在钨上沉积的碳减少了2-4倍。与中性束加热等离子体相比，沉积在暴露于Ohmic的限幅器上沉积了系统更高数量的C-13（约为1.5-2.5倍）。

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