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首页> 外文期刊>Plasma physics and controlled fusion >Investigation of Z(eff) and impurity behaviour in lithium coating experiments with full metallic first wall in HT-7 tokamak
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Investigation of Z(eff) and impurity behaviour in lithium coating experiments with full metallic first wall in HT-7 tokamak

机译：HT-7托卡马克全金属第一壁锂涂层实验中Z（eff）和杂质行为的研究

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The control of the impurity level in magnetically confined plasmas is a critical issue for future fusion devices. All the graphite tiles have been replaced by molybdenum tiles as limiter materials in the 2011 spring campaign in order to further reduce the recycling and hydrogen content of the plasma. A lithium coating technique has been applied as an important wall conditioning method to the HT-7 tokamak. The effective ion charge Z(eff) and impurity behavior with full metallic first walls of high-Z materials and lower hydrogen recycling have been investigated in a series of lithium coating experiments in this paper. Plasma performance and impurity behavior without wall coatings are studied in the early stage of the campaign. Comparison of Z(eff) with different plasma-facing components has been made. A typical lithium coating experiment has been analyzed in order to understand the effect of lithium coating. The evolution of main impurity line radiation, Z(eff) and the H/(H + D) ratio is analyzed in detail as lithium coating is repeated, indicating that lithium coating is a very effective tool to control impurity level and reduce hydrogen recycling. Furthermore, a boronization is conducted at the end of this campaign in order to make comparison with lithium coating. Experimental results show that lithium coating has much more advantages in edge recycling control, though it does not reduce impurity level as effectively as boronization.
机译：磁约束等离子体中杂质水平的控制对于未来的聚变设备至关重要。在2011年春季活动中，所有石墨砖均已被钼砖作为限制材料，以进一步减少等离子体的循环利用和氢含量。锂涂层技术已被用作HT-7托卡马克的重要墙面调节方法。本文在一系列锂涂层实验中研究了高Z材料的全金属第一壁的有效离子电荷Z（eff）和杂质行为以及较低的氢再循环。在运动的早期阶段就研究了无壁涂层的等离子体性能和杂质行为。 Z（eff）与不同的面向等离子体的组件的比较。为了了解锂涂层的效果，对典型的锂涂层实验进行了分析。当重复进行锂镀覆时，详细分析了主要杂质线辐射，Z（eff）和H /（H + D）比的变化，表明锂镀膜是控制杂质水平和减少氢循环的非常有效的工具。此外，在该活动结束时进行了硼化处理，以便与锂涂层进行比较。实验结果表明，锂涂层在边缘再循环控制方面具有更多优势，尽管它不能像硼化一样有效地降低杂质含量。

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