Experimental method for plasma movement in a hole
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摘要: 在间接驱动惯性约束聚变的黑腔中，辐射烧蚀的高Z等离子体的流体力学运动过程对激光注入黑腔的效率、辐射场均匀性和通过诊断口的黑腔辐射温度诊断都有显著影响。为研究诊断口在黑腔辐射场中的等离子体缩口过程，用激光产生X光辐射加热低Z泡沫填充的金黑腔诊断口，以激光辐照钛平面靶产生的2～5 keV高能段窄能区X光作为背光源，用X光分幅相机获得了源靶和小孔靶两种靶型的小孔等离子体运动过程图像，研究了X光烧蚀的小孔等离子体的流体力学运动过程，探索了定量测量小孔等离子体面密度的空间分布与时间演化过程的实验诊断方法,初步给出小孔等离子体的面密度。Abstract: In the hohlraum of laser indirect-drive inertial confinement fusion (ICF), hydrodynamic moving processes of radiation-ablated high-Z plasma have great influence on laser injection efficiency, radiation uniformity and measurement of the hohlraum radiation temperature at the diagnosis hole (DH). To study the plasma filling in the DH, using laser-produced X-ray to heat low-Z foam-tamped high-Z gold DH, and using laser-irradiated Ti disk to generate 2-5 keV high and narrow energy X-ray as the intense backlighter source, the plasma movement in a hole was measured by an X-ray framing camera(XFC). A quantificational measuring method for the areal density distribution and evolution of plasma in a hole was studied.
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Key words:
- small hole /
- plasma movement /
- x-ray farming camera /
- areal density
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