黑腔LEH堵孔实验研究取得新进展

基金项目:

国家自然科学基金青年基金项目 11705180

Experimental study on laser entrance hole closure of hohlraum in ICF

1.
Research Center of Laser Fusion, CAEP, Mianyang 621900, China
2.
Institute of Applied Physics and Computational Mathematics, Beijing 100088, China

摘要: 在神光Ⅲ主机激光装置上，采用单端带激光注入孔(LEH)的桶状黑腔，利用极区分幅相机和极区附近X光条纹相机获得黑腔内壁附近和LEH附近等离子体的X射线发射时空演化图像，进而研究LEH堵孔特性。X光图像清晰地展示了激光光斑移动、LEH附近等离子体缩孔和堵孔过程，为优化LEH尺寸提供了实验依据。
- 黑腔 /
- 等离子体 /
- 激光注入孔 /
- 堵孔
Abstract: On Shenguang Ⅲ laser facility, 32 laser beams were symmetrically injected a gas-filled hohlraum to create plasma situation which is close to the ignition condition. An X-ray framing camera on the polar station and an X-ray streak camera near the pole were utilized to obtain the temporal and spacial evolution X-ray images of the plasma from the hohlraum wall and near the laser entrance hole (LEH), which were used to analyse the LEH closure feature of the hohlraum with various LEH size. The experimental results clearly demonstrated the evolution of laser spot motion, plasma expanding near the LEH and closure of the LEH, which supplied the foundation to optimize the LEH dimension.
- hohlraum /
- plasma /
- laser entrance hole /
- laser entrance hole closure

图 1 实验排布、诊断布局

Figure 1. Schematic configuration of the experiment and diagnostics

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图 2 双端32束激光注入时上42°、下42° FXRD获得的LEH端和敞口端辐射温度曲线

Figure 2. Radiation temperature from 42° FXRD on laser entrance hole (LEH) end and open end, respectively

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图 3 不同LEH尺寸下的XFC成像结果

Figure 3. X-ray framing camera (XFC) images at various LEH size

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图 4 单端、双端注入情况下的XSC成像结果

Figure 4. X-ray streak camera (XSC) images at different laser injection condition

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