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Evaluation of the scavenging effect by low temperature laboratory plasmas driven with radiofrequency

机译：射频驱动的低温实验室等离子体对清除效果的评估

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Proposed materials for ITER are beryllium for first wall and tungsten tiles (plus carbon fibre composites) for the divertor. The use of carbon materials at the divertor plates of ITER can be problematic due to the formation of tritium-containing co-deposits coming from the products of chemical erosion and physical sputtering. Scavenging effect in the hidden regions of the divertor has been proposed as a possible technique to eliminate the formation of amorphous carbon films. Nitrogen gas has been proposed as a good scavenger. Although a complete suppression of the formation of amorphous carbon films by nitrogen was achieved in laboratory experiments (in a low temperature plasma), only a moderate reduction (<30-40%) was seen at JET in type-III ELM discharges (Tabares et al 2005 J. Nucl. Mater. 337-339 867-71). This justifies further analyses for an understanding of physicochemical processes for the deposition/inhibition of carbon films. In this work, experiments in RF plasma discharges at low pressures of CH_4/N_2 admixtures were carried out. The formation of amorphous carbon films was investigated under different physical conditions, with high and low energetic ions on powered and floating electrodes, respectively. Optical emission spectroscopy of ion and neutral species was employed as the main diagnostic.
机译：用于ITER的建议材料是用于第一壁的铍和用于分流器的钨瓦（加上碳纤维复合材料）。由于化学腐蚀和物理溅射的产物会形成含tri共沉积物，因此在ITER的分流板上使用碳材料可能会出现问题。已经提出了在偏滤器的隐藏区域中的清除效果作为消除非晶碳膜形成的可能技术。氮气被认为是一种很好的清除剂。尽管在实验室实验中（在低温等离子体中）可以完全抑制氮对无定形碳膜形成的影响，但在III型ELM放电的JET上只能看到中等程度的减少（<30-40％）（Tabares等人）等，2005 J.Nucl.Mater.337-339 867-71）。这证明了进一步的分析对理解碳膜沉积/抑制的物理化学过程的正确性。在这项工作中，进行了在CH_4 / N_2混合物的低压下进行RF等离子体放电的实验。在不同的物理条件下研究了无定形碳膜的形成，分别在动力电极和浮动电极上具有高和低的高能离子。离子和中性物质的发射光谱被用作主要诊断。

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