X光分幅相机在黑腔等离子体填充特性研究中的应用
Characterization of plasma filling in hohlraum using X-ray framing camera
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摘要: 在神光Ⅱ装置上2.4 ns长脉冲三倍频激光（激光能量8×300 J）与腔靶耦合实验研究中，X光分幅相机通过激光注入孔观测获得了3种腔尺寸腔内Au等离子体径向运动时空分辨图像。用MATLAB对图像进行了定量处理，结合时间分辨辐射温度测量结果分析表明：在腔内不充气、无低Z衬垫情况下，标准腔（800 μm×1 350 μm）在激光脉冲作用到约1.5 ns时出现明显的Au等离子体堵腔效应；当腔尺寸放大到1.25倍（1 000 μm×1 800 μm）和1.5倍（1 200 μm×2 100 μm）时，腔内等离子体基本不堵腔。给出了3种腔尺寸不同时期腔内Au等离子体径向聚心速度，分析表明：大腔的聚心速度比小腔的慢，后期比初期慢。Abstract: A microchannel plate gated X-ray framing camera(XFC) was used to take pictures of Au plasma radial convergence in hohlraums on Shenguang-Ⅱ laser facility. According to XFC image manipulation by MATLAB and measurement of radiation temperature, hohlraum closure of Au plasma generally will not occur in hohlraums with sizes of 1 000 μm×1 800 μm and 1 200 μm×2 100 μm,on condition that there is no gas and low-Z filling in hohlraum, by laser beams with 351 nm wavelength, 2.4 ns pulse duration and 8×300 J energy on Shenguang-Ⅱ laser facility. While obvious hohlraum closure of Au plasma would occur in the standard hohlraum(800 μm×1 350 μm ) with the laser applied for about 1.5 ns. Additionally, XFC image manipulation unveiled Au plasma radial convergence speed in the three hohlraums, w
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Key words:
- x-ray framing camera /
- hohlraum /
- plasma filling /
- hohlraum closure /
- radial convergence speed
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