用激光诱导烧蚀四极质谱法深度分辨分析W7-X石墨组分中的氢

2019/03/14   下载量： 5 次

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应用领域 能源/新能源
检测样本 其他
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采用立陶宛Ekspla公司的皮秒Nd:YVO4激光器，进行皮秒激光烧蚀四极质谱法深度分辨分析探测W7-X石墨组分中的氢成分的实验研究

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A deep understanding of the plasma-wall interaction processes in fusion devices like Wendelstein 7-X is necessary for an efficient plasma operation and a long lifetime of the plasma-facing components. In this work we present an approach employing residual gas analysis after picosecond laser-induced ablation (ps LIA-QMS) of graphite limiter tiles, exposed in the first plasma operational phase of Wendelstein 7-X, for depth-resolved and quantitative hydrogen content analysis. A series of poloidal and toroidal locations are
analyzed at three of the five limiters, showing up to 2.3×1022 hydrogen atoms/m2 in net-deposition areas after a total plasma exposure of about 311 s in mixed hydrogen and helium operation. Shallow implantation of hydrogen is observed in erosion zones, where a low fuel content is present due to the high surface temperature during plasma operation. The hydrogen content spans between (1.1 and 3.7)×1021 hydrogen atoms/m2 in the net-erosion areas. Moreover, oxygen has been analyzed and its appearance in both the implantation and deposition zone was verified. Results are compared to thermal desorption spectrometry and to simultaneously performed laser-induced breakdown spectroscopy (LIBS) measurements.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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