Surface loss probabilities of hydrocarbon radicals on amorphous hydrogenated carbon film surfaces: Consequences for the formation of re-deposited layers in fusion experiments
Surface loss probabilities of hydrocarbon radicals on amorphous hydrogenated carbon film surfaces: Consequences for the formation of re-deposited layers in fusion experiments
复制标题
非晶氢化碳膜表面烃基的表面损失概率：聚变实验中形成再沉积层的后果
DOI：
10.1088/0029-5515/39/10/307
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发表时间：
1999
期刊：
影响因子：
3.3
通讯作者：
W. Jacob
中科院分区：
文献类型：
--
作者：
A. Keudell;C. Hopf;T. Schwarz;W. Jacob
当今聚变实验的成功依赖于偏滤器的使用，该偏滤器有效地泵送第一壁侵蚀产生的杂质。在大多数聚变实验中，偏滤器表面由石墨瓦或碳纤维复合材料构成。它们被来自刮除层的离子轰击，这些离子被磁场引导到偏滤器中。这种撞击离子通量导致偏滤器瓦片的溅射，将碳和烃化合物释放到气相中。这种发射的碳通量在偏滤器等离子体中被激发，并通过辐射耗散等离子体功率，导致偏滤器表面上的热通量减少。大多数排放的碳和碳氢化合物物种迅速重新沉积在偏滤器内或偏滤器附近。沉积和侵蚀之间的这种平衡对于下一步装置中偏滤器的性能至关重要，因为更换之前的总寿命在很大程度上取决于控制这种再沉积的能力。
The success of present-day fusion experiments relies on the use of a divertor which efficiently pumps impurities generated by erosion of the first wall. In most fusion experiments the divertor surface consists of graphite tiles or carbon fiber composites. They are bombarded by ions from the scrape-off layer which are guided into the divertor by the magnetic field. This impinging ion flux leads to sputtering of the divertor tiles releasing carbon and hydrocarbon compounds into the gas phase. This emitted carbon flux is excited in the divertor plasma and dissipates the plasma power via radiation, leading to a reduction of the heat flux onto the divertor surface. Most emitted carbon and hydrocarbon species re-deposit promptly in or in proximity to the divertor. This balance between deposition and erosion is crucial for the performance of a divertor in a next-step device, since the total lifetime before replacement strongly depends on the ability to control this re-deposition.