Author Affiliations
Abstract
1 Department of Physics SUPA, University of Strathclyde, G4 0NG, UK
2 Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
3 York Plasma Institute, University of York, YO10 5DD, UK
4 STFC-Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
The spatial-intensity profile of light reflected during the interaction of an intense laser pulse with a microstructured target is investigated experimentally and the potential to apply this as a diagnostic of the interaction physics is explored numerically. Diffraction and speckle patterns are measured in the specularly reflected light in the cases of targets with regular groove and needle-like structures, respectively, highlighting the potential to use this as a diagnostic of the evolving plasma surface. It is shown, via ray-tracing and numerical modelling, that for a laser focal spot diameter smaller than the periodicity of the target structure, the reflected light patterns can potentially be used to diagnose the degree of plasma expansion, and by extension the local plasma temperature, at the focus of the intense laser light. The reflected patterns could also be used to diagnose the size of the laser focal spot during a high-intensity interaction when using a regular structure with known spacing.
high power laser laser–solid interactions plasma temperature diagnosis High Power Laser Science and Engineering
2019, 7(1): 010000e2
1 南京理工大学化工学院, 江苏 南京210094
2 巢湖大学化学系, 安徽 巢湖238000
半导体桥（SCB）通过桥膜放电进行含能材料的点火, 具有低点火能量、 高安全性以及能与数字逻辑电路组合等优点。 文章利用原子发射光谱技术研究了其放电特性。 首先用Cu原子谱线510.5和521.8 nm进行温度测量, 用Si原子谱线390.5 nm和Si离子线413.0 nm进行电子密度测量, 同时获得SCB放电温度和电子密度随时间分布的测量结果。 在放电电压为20 V, 充电电容为47 μF条件下, 1.0 Ω的SCB放电温度分布在2 500～4 300 K之间, 电子密度约为1016 cm-3左右。 然后根据光谱诊断结果, 结合等离子体成立的空间尺度和时间尺度条件, 判断两种规格的SCB的放电行为是否产生等离子体。 该研究结果为SCB桥体的设计以及点火方式的控制提供了理论依据, 也为瞬态小尺寸等离子体的判断和诊断提供了一种参考方法。
原子发射光谱法 温度诊断 电子密度诊断 等离子体判据 SCB放电 Atomic emission spectroscopy Temperature diagnosis Density diagnosis Plasma criterion SCB discharge 光谱学与光谱分析
2009, 29(11): 3130
四川大学原子分子物理研究所,四川,成都,610065
采用“多功能相对论原子结构计算程序”GRASP2 (1 992 ),分别计算了类氢离子 Mg11+,Al12 + 能级之间电偶跃迁 (E1 )的波长、几率和振子强度,其中跃迁波长值与实验值相吻合。充分利用计算结果,采用等电子线率法对文献 [4]的谱线强度比测温实验进行理论上的探讨,即利用原子序数相差不大 (ΔZ=1,2 )的两种示踪原子相同离化态的同种跃迁谱线进行电子温度诊断,以期望提高测温精度
类氢离子 跃迁光谱 温度诊断 H-like ions Mg11+ Mg11+ Al12+ Al12+ transition spectrum temperature diagnosis
