Diagnostics of First Wall Materials in a Magnetically Confined Fusion Device by Polarization-Resolved Laser-Induced Breakdown Spectroscopy
Diagnostics of First Wall Materials in a Magnetically Confined Fusion Device by Polarization-Resolved Laser-Induced Breakdown Spectroscopy
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通过偏振分辨激光诱导击穿光谱诊断磁约束聚变装置中的第一壁材料
DOI：
10.1088/1009-0630/16/2/11
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发表时间：
2014-02
影响因子：
1.7
通讯作者：
Ding Hongbin
中科院分区：
文献类型：
--
作者：
Farid, Nazar;Hai Ran;Wu Ding;Ding Hongbin
激光诱导击穿光谱（LIBS）是一种强大的分析工具，用于实时诊断和检测沉积在磁约束等离子体聚变装置第一壁的多个元素。最近，我们已经测试了LIBS在我们的实验室中的应用，在融合设备EAST的原位实时诊断。在本研究中，我们应用偏振分辨LIBS（PR-LIBS）来减少背景连续谱，提高LIBS的分辨率和灵敏度。我们使用铝（Al）（作为Be的替代物）和第一壁材料钨（W）和钼（Mo）来研究偏振连续发射和信号背景比（SBR）。采用一次、二次和三次谐波Nd：YAG激光产生等离子体。研究了激光偏振面、环境气压和起偏器探测角对测量结果的影响。将不使用偏振器（即LIBS）获得的光谱与使用偏振器（PR-LIBS）获得的光谱进行比较。观察到发射光谱强度的分布遵循Malus定律，相对于偏振器的检测角度的变化。PR-LIBS获得的光谱比LIBS获得的光谱具有更高的SBR和更大的稳定性，从而提高了LIBS定量分析的可靠性。Al、Mo和W的比较表明，W比低Z元素具有更高的连续性和更强的极化。
Laser-induced breakdown spectroscopy (LIBS) is a powerful analytical tool for real-time diagnostics and detection of multiple elements deposited at the first wall of magnetically confined plasma fusion devices. Recently, we have tested LIBS in our laboratory for application to in situ real-time diagnostics in the fusion device EAST. In this study, we applied polarization-resolved LIBS (PR-LIBS) to reduce the background continuum and enhance the resolution and sensitivity of LIBS. We used aluminium (Al) (as a substitute for Be) and the first wall materials tungsten (W) and molybdenum (Mo) to investigate polarized continuum emission and signal-to-background ratio (SBR). A Nd:YAG laser with first, second and third harmonics was used to produce plasma. The effects of the laser polarization plane, environmental pressure and polarizer detection angle were investigated. The spectra obtained without using a polarizer (i.e. LIBS) were compared with those obtained with a polarizer (PR-LIBS). Distribution of emission spectral intensity was observed to follow Malus' law with respect to variation in the angle of detection of the polarizer. The spectra obtained by PR-LIBS had a higher SBR and greater stability than those obtained by LIBS, thereby enhancing the reliability of LIBS for quantitative analyses. A comparison of Al, Mo and W showed that W exhibited a higher continuum with stronger polarization than the low-Z elements.
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使用 Nd:YAG 激光器的一次、二次和三次谐波对钨等离子体进行激光诱导击穿光谱表征
影响因子：
3.1
作者：
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影响因子：
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DOI：
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发表时间：
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