Inspection of W 7-X plasma-facing components after the operation phase OP1.2b: observations and first assessments
Inspection of W 7-X plasma-facing components after the operation phase OP1.2b: observations and first assessments
复制标题
运行阶段 OP1.2b 后对 W 7-X 面向等离子体的组件进行检查：观察和首次评估
DOI：
10.1088/1402-4896/ab4b3f
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发表时间：
2020
期刊：
影响因子：
2.9
通讯作者：
the W7-X Team
中科院分区：
文献类型：
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作者：
Dhard C P;?k?slompolo S;Balden M;Baldzuhn J;Biedermann C;Br?uer T;Brezinsek S;Endler M;Hayashi Y;Hwangbo D;Kajita S;Krause M;Kornejew P;Masuzaki S;Mayer M;Motojima G;Naujoks D;Otte M;Rohde V;the W7-X Team
由于其扭曲的磁场结构，Wendelstein 7-X仿星器的等离子体面组件（pfc）在一个模块内沿等离子体轴方向由豆形变为三角形。pfc由石墨（测试分流器单元、挡板、头部屏蔽瓦、环形分流器闭包）和不锈钢组件（壁板、泵隙板、极向闭包）组成。为了记录这些组件的状态以及获得等离子体运动期间发生的等离子体壁相互作用（PWI）的第一个足迹，在等离子体运动后对整个等离子体血管进行详细检查是至关重要的。这种检查是在OP1操作阶段之后进行的。2b于2018年10月完工。研究人员进行了大量的观察，例如，熔化的不锈钢液滴、长期探针的熔化、钢板上的沉积、电弧痕迹、松散结合的颗粒和隐藏在石墨瓦后面的等离子体容器上的沉积条纹。为了了解可能的原因，它们的含义和步骤，以避免一些这些问题的机器下一阶段的操作，进行了评估。融化事件应该在未来避免，其他的是由于通常的PWI机制，并将在每次活动后进行监测。
Due to its twisted magnetic field configurations, the orientation of the plasma-facing components (PFCs) of the Wendelstein 7-X stellarator is changed from bean shape to triangular shape along the plasma axis within a module. The PFCs consist of graphite (test divertor units, baffles, head shield tiles, toroidal divertor closures) and stainless steel components (wall panels, pumping gap panels, poloidal closures). In order to document the status of these components as well as to get the first footprints of the plasma-wall interactions (PWI) that occurred during the plasma campaign, a detailed inspection of the whole plasma vessel after the plasma campaign is of vital importance. Such an inspection was carried out after the operation phase OP1. 2b completed in October 2018. A number of observations were made, such as, molten stainless steel drops, melting of a long term probe, deposition on steel panels, arc traces, loosely bound particles and deposition stripes on the plasma vessel hidden behind the graphite tiles. In order to understand the possible causes, their implication and steps to avoid some of these problems for the next phase of machine operation, an assessment was made. The melting events should be avoided in the future, the others are due to usual PWI mechanisms and will be monitored after each campaign.