Demonstration of indirectly driven implosion experiments with cryogenic pure deuterium layered capsules on the Shenguang Laser Facility

Ge, Fengjun; Pu, Yudong; Wang, Kai; Huang, Tsung-Yi; Sun, Chuanxiang; Qi, Xin; Wu, Congcong; Gu, Jiayang; Chen, Zhongjing; Yan, Jun; Jiang, Wei; Yang, Dong; Dong, Yunsong; Wang, Feng; Zou, Shiyang; Ding, Yalin

doi:10.1088/1741-4326/acdfe3

Cited by 2 publications

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“…我国激光聚变研究中整形脉冲条件下的综合内爆实验研究主要依托十万焦耳激光装置 [15] 开展, 并取得了一系列的内爆物理实验成果 [16][17][18][19] . 其中面向高性能内爆的熵增调谐需求的冲击波调控实验技术研究, 相比美国百万焦耳级的NIF装置, 具有更强的技术挑战性.…”

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“…NIF冲击波调控实验中靶丸内半径为1 mm, VISAR诊断的有效空间区域约300 μm, 容易实现高精度诊断应用. 而我国十万焦耳激光装置受限于驱动能力, 内爆靶丸的典型尺度只有NIF靶丸大小的1/3 [18] , VISAR 诊断的有效空间区域仅为80 μm. 而且随着球形冲击波向靶丸内传输, 有效空间区域还将进一步减小, 导致VISAR数据的干涉条纹数减少, 这将严重影响图像质量和数据分析精度 [20,21] .…”

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Optimization and application of shock wave measurement technology for shock-timing experiments on small-scale capsules

Yang,

Duan,

Zhang

et al. 2024

Acta Phys. Sin.

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In the realm of laser fusion research, the precision of shock-timing technology is pivotal for attaining optimal adiabat tuning during the compression phase of fusion capsules, which is crucial for ensuring the high-performance implosion. The current main technological approach for shock-timing experiments is the use of keyhole targets and VISAR diagnostics to measure the shock velocity history. Nonetheless, this approach encounters limitations when scaling down to smaller capsules, primarily due to the reduced effective reflection area available for VISAR diagnostics. This study introduces a novel high-precision shock-timing experimental methodology for a double-step radiation-driven implosion with a 0.375mm radius capsule on a 100 kJ laser facility. By developing a theoretical framework for calculating the intensity of VISAR images with spherical reflective surfaces, an innovative experimental technical route is proposed to utilize the keyhole cone reflection effect to enhance the VISAR diagnostic spatial area, effectively increasing the effective data collection region by nearly threefold for small-scale capsules. The technique has been adeptly applied to measure shock waves in cryogenic liquid-deuterium-filled capsules under shaped implosion experimental conditions, obtaining high-precision shock-timing experimental data. Experimental data reveals that the application of this technology has markedly enhanced both the image quality and the precision of data analysis for shock wave velocity measurements in small-scale capsules. Furthermore, it has been discovered that under similar laser conditions, there exist considerable variations in the shock velocity profiles. Simulation analysis suggests that the differences in the "N+1" reflected shock wave's catching-up behavior, caused by minor variations in laser intensity, are the main reason for the substantial merge velocity differences. It is demonstrated that minor variations in laser parameters can significantly affect the transmission behavior of the shock wave. This experiment highlights the intricate sensitivity of shock wave transmission in the high-performance shaped implosion physics process at the current small capsule scale, and it is essential to conduct shock-timing experiments for precisely tuning the actual shock wave behavior. This research not only lays a robust technical foundation for the advancement of adiabat tuning experiments on China's 100 kJ laser facility but also carries profound implications for the ultra-high pressure physics research based on the spherical convergence effect.

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Optimization and application of shock wave measurement technology for shock-timing experiments on small-scale capsules

Yang,

Duan,

Zhang

et al. 2024

Acta Phys. Sin.

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Effect of laser ablation on the conductivity and laser-induced damage threshold of fused silica components

Lou,

Liu,

Jia

et al. 2024

Mod. Phys. Lett. B

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When irradiated by high-power lasers, fused silica optical component can be ablated, which seriously affects their laser-conducing capability and service life. Numerical simulations have been applied to investigate the ablation process, laser-induced damage threshold (LIDT), and propagation loss of fused silica optical component. The depth of the ablation crater increases linearly with the duration of irradiation, while the rate of development in the width of the ablation crater gradually decreases. The LIDT of the front surface of the fused silica optical component will significantly decrease, while the propagation loss of the fused silica component will have a considerable increase when the front surface of fused silica is damaged under laser irradiation. The propagation loss and the LIDT of the fused silica’s front surface are 26.49, 21.19, 20.60, 16.83, and 16.41[Formula: see text]GW/cm2 and 0.41, 1.02, 2.24, 3.46, and 5.31[Formula: see text]dB, respectively, after 50, 100, 150, 200, and 250[Formula: see text][Formula: see text]s of ablation. This work provides novel opportunities for investigating the intrinsic mechanism of laser-induced damage to fused silica, and offers guidance for the future development of fused silica optical elements that are highly resistant to laser-induced damage.

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Demonstration of indirectly driven implosion experiments with cryogenic pure deuterium layered capsules on the Shenguang Laser Facility

Cited by 2 publications

References 39 publications

Optimization and application of shock wave measurement technology for shock-timing experiments on small-scale capsules

Optimization and application of shock wave measurement technology for shock-timing experiments on small-scale capsules

Effect of laser ablation on the conductivity and laser-induced damage threshold of fused silica components

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