其他null检测 | 用纳秒和皮秒激光器获得ITER相关样品的LIBS测量结果比较-北京欧兰科技发展有限公司

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应用领域	能源/新能源
检测样本	其他
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参考标准	暂无

采用立陶宛Ekspla公司的SL系列高能皮秒激光器对国际热核聚变实验堆（ITER）计划相关靶材料样品进行了激光诱导击穿光谱学（LIBS）测量和研究。

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Ekspla SL330型SBS压缩皮秒激光器
型号：SL330

¥50万 - 100万
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ITER foresees applying laser induced breakdown spectroscopy (LIBS) as a tool for quantitative assessment of fuel retention in the first walls. One open problem related to LIBS application is the choice of the laser type. Here we compare two Nd/YAG lasers with different pulse durations, 0.15 and 8 ns, working at λ=1064 nm for LIBS studies of samples with D-doped W/Al coatings of≈3 μm thickness (Al is used as a proxy of Be) on Mo. Low pressure argon was used as a background gas. Experiments were done in conditions where other factors (broadening of spectral lines, signal-to-noise ratio, limited thickness of coatings etc.) did not shadow the effect of laser pulse duration. For these reasons, low pressure argon was used as the background gas and fluences were kept at comparatively low values. Spectra of laser-produced plasma were recorded as a function of the number of laser pulses.
Partially overlapping lines of hydrogen isotopes were fitted with Voigt contours, intensities were fitted and depth profiles of deuterium were reconstructed. The relative standard error of curve-fitting of spectra recorded with the laser of shorter pulse duration was two times smaller than that recorded by the longer pulse laser. The electron density was found from the Stark broadening of Hα line of the laser-produced plasma and the electron temperature of plasma was found on the basis W and Mo lines. It was found that in the case of ps laser an acceptable accuracy of the detection of deuterium was possible at considerably lower values of fluence. Steps needed for comparison of ps and ns lasers in ITER-relevant conditions were discussed.

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