On the formation of a-C:D layers and parasitic plasmas underneath the roof baffle of the ASDEX Upgrade divertor
On the formation of a-C:D layers and parasitic plasmas underneath the roof baffle of the ASDEX Upgrade divertor
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关于 ASDEX Upgrade 偏滤器顶部挡板下方 a-C:D 层和寄生等离子体的形成
DOI：
10.1016/s0022-3115(02)01335-1
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发表时间：
2003
影响因子：
3.1
通讯作者：
M. Mayer
中科院分区：
文献类型：
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作者：
V. Rohde;M. Mayer
在未来聚变装置中使用碳的关键问题是形成含氚的a-C:H层。 ASDEX 升级提供了在 ITER 相关偏滤器条件下研究这些层的可能性。长期探测表明，新型偏滤器（Div IIb）结构下的层生长与 Div II 非常相似。附加的石英微天平监测器可对逐次发射的层生长进行测量。人们发现这些层在活动期间不断增长。使用类似的镜头，可以找到增长率与偏滤器中性压力的比例。安装在偏滤器结构下方的朗缪尔探针测量了电子密度高达 1×1018m−3 的强烈变化的等离子体。这种寄生等离子体的密度与偏滤器辐射和中性密度相关，这表明光电离或光发射是等离子体的起源。
The key problem for the use of carbon in a future fusion device is the formation of tritium containing a-C:H layers. ASDEX Upgrade offers the possibility to investigate these layers at ITER relevant divertor conditions. Long term probes show, that the layer growth under the structure of the new divertor (Div IIb) is very similar to Div II. Additional quartz microbalance monitors offers measurements on the layers growth on a shot-to-shot base. The layers are found to grow continuously during the campaign. Using similar shots, a proportionality of the growth rate to the divertor neutral pressure is found. A Langmuir probe, installed below the divertor structure, measured a strongly variable plasma with electron densities up to 1×1018m−3. The density of this parasitic plasma is correlated to the divertor radiation and neutral density, which point to photo ionisation or photo emission as the origin of the plasma.
Volker Philipps：“TEXTOR 中的钼测试限制器实验”核聚变（待出版）。
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