Study on M-band radiation spectrum of laser driven multilayer composite target
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摘要: 时间分辨X射线吸收精细结构谱技术需要产生高亮度、均匀、宽光谱的X射线源。单一靶材产生的M带辐射源亮度高，但均匀性较差，因此提出了一种使用多种金属材料制备的多层膜复合靶产生M带辐射的方案。针对Si的K边X射线吸收谱实验，根据前期单一靶材M带光谱实验数据理论计算了最优的材料比例，制备了Au、Yb、Dy三种材料组成的多层膜复合靶，并在神光II激光装置上开展了脉冲激光驱动的多层膜复合靶辐射光谱测量，实验结果和理论计算基本一致。相比单一靶材，多层膜复合靶产生的M带辐射源具有光谱宽、整体亮度均匀的优点，在时间分辨X射线吸收精细结构谱中具有较大的应用潜力。Abstract: Time-resolved X-ray absorption fine structure spectrum technology needs to produce X-ray source with high brightness, uniform and wide spectrum. The M-band radiation source generated by an elementary target has high brightness, but poor uniformity. Therefore, this paper proposes a scheme to generate M-band radiation using a multilayer composite target prepared by a variety of metallic materials. For the K edge X-ray absorption spectroscopy experiment of Si, the optimal material ratio was theoretically calculated according to the previous elementary target M-band spectrum experiment data, and the multilayer composite target composed of Au, Yb, Dy was prepared. The radiation spectrum measurement of the multilayer composite target driven by pulse laser was carried out on the Shenguang II laser facility, and the experimental results were basically consistent with the theoretical calculation. Compared with an elementary target, the M-band radiation source generated by multilayer composite target has the advantages of wide spectrum and uniform overall brightness, and has great application potential in time-resolved X-ray absorption fine structure spectroscopy experiments.
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Key words:
- spectroscopy /
- X-ray absorption fine structure /
- multilayer /
- composite target /
- M-band radiation
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图 1 纳秒强激光辐照单一金属靶材产生的等离子体光谱
Figure 1. Plasma spectra generated by nanosecond high power laser irradiating on elementary metal target[16]
图 3 激光等离子体光谱测量实验布局示意图
Figure 3. Experimental layout of laser plasma spectrum measurement
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