Experiment on measurement of fuel symmetry and density of cone-in-shell target for fast ignition
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摘要: 快点火激光惯性约束聚变将压缩与点火过程分开，与中心点火方式相比，大大放宽了对压缩对称性和能量的要求，是国际惯性约束聚变研究的热点方向。在神光Ⅱ装置上开展的快点火锥壳靶预压缩实验中，背光分幅图像显示导引锥及输运丝对靶丸预压缩过程无明显影响，实验结果与一维数值模拟结果吻合也证明了该结论；实验中通过调节导引锥尺寸和相对靶丸的位置，可保证最大压缩时刻导引锥保存完好，这对超热电子的输运以及能量沉积是至关重要的。Abstract: Fast ignition of laser inertial confinement fusion separates the compression and ignition, thus relaxes the requirements on compression symmetry and energy. In the experiments of pre-compression of cone-in-shell target for fast ignition on Shenguang Ⅱ laser facility, the framed X-ray backlight images show that the existence of cone and guiding wire does not affect the implosion process, which has been demonstrated by the agreement of experimental results and one-dimensional radiation hydrodynamic simulation results. Adjusting the position of cone and fuel capsule, the cone can be kept robust until the stagnation, which is crucial for the transport and deposit of hot electrons.
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Key words:
- fast ignition /
- cone-in-shell target /
- pre-compression /
- symmetry /
- density measurement
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