The two-laser entrance hole (LEHs) spherical hohlraum energetic experiments with all 48 laser beams and two laser pulse shapes at the 100 kJ level laser facility were investigated. In this work, the time-resolved radiation temperature measured by multi-angle x-ray diodes agreed well with LARED simulations, and the peak radiation temperature was up to 260 eV with the laser power of 45 TW. Meanwhile, the backscattered laser energy fraction was less than 5% in the majority of shots, which proposed a low level of laser–plasma interaction (LPI) effect in the spherical hohlraum. However, in the shaped pulse shots with capsules, the stimulated Raman scattering (SRS) of smaller incident angle lasers was significantly increased to 15%. The measured SRS spectrum and LARED simulations showed that the increase in the LPI effects caused by the ablated CH plasma was around 0.1Nc (Nc is the critical density). In summary, according to the experimental results, the x-ray conversion efficiency of the vacuum spherical hohlraum was 85%–88% in 3 ns square pulses and 89%–93% in 3.6 ns shaped pulses. It was closer to that of the two-LEH cylindrical hohlraum at the Shen-Guang and NIF facilities.

中文翻译：

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100 kJ级激光装置二入口孔球形空腔的空腔能量学实验研究

研究了在 100 kJ 级激光设备上使用所有 48 束激光和两种激光脉冲形状的双激光入射孔 (LEH) 球形空腔能量实验。在这项工作中，多角度X射线二极管测量的时间分辨辐射温度与LARED模拟非常吻合，峰值辐射温度高达260 eV，激光功率为45 TW。同时，在大多数射击中，背向散射的激光能量分数小于 5%，这表明球形空腔中存在低水平的激光-等离子体相互作用 (LPI) 效应。然而，在使用胶囊的成形脉冲射击中，较小入射角激光的受激拉曼散射 (SRS) 显着增加到 15%。测量的 SRS 光谱和 LARED 模拟表明，由烧蚀的 CH 等离子体引起的 LPI 效应的增加约为 0.1Nc（Nc 是临界密度）。综上所述，根据实验结果，真空球形空腔的 X 射线转换效率在 3 ns 方形脉冲中为 85%~88%，在 3.6 ns 形脉冲中为 89%~93%。它更接近神光和 NIF 设施的两个 LEH 圆柱形空腔。