The influence of driven asymmetry on yield degradation in shaped-pulse indirect-drive implosion experiments at the 100 kJ laser facility
The influence of driven asymmetry on yield degradation in shaped-pulse indirect-drive implosion experiments at the 100 kJ laser facility
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100 kJ 激光装置整形脉冲间接驱动内爆实验中驱动不对称性对产量下降的影响
DOI：
10.1088/1741-4326/abbf61
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发表时间：
2020
期刊：
影响因子：
3.3
通讯作者：
Xian Tu He
中科院分区：
文献类型：
--
作者：
Ji Yan;Hao Shen;Zhong Jing Chen;Hui Cao;Chuan Kui Sun;Zhen Sheng Dai;Ji Wei Li;Wei Jiang;Zi Feng Song;Xiao Shi Peng;Xing Zhang;Bo Yu;Yu Dong Pu;Tian Xuan Huang;Yun Song Dong;Li Feng Wang;Shao′En Jiang;Xian Tu He
在100 kJ激光装置上研究了整形脉冲间接驱动内爆中低模驱动的非对称性对产额退化的影响。在这项工作中，通过改变空腔气体填充密度和胶囊直径来调整P2和P4驱动的不对称性。测量的中子产额从2.1 × 109变化到7.6 × 109，一维模拟（YOC 1D）测量的产额从3%增加到16%。同时，考虑到时间P2和P4驱动的不对称性，通过2D模拟（YOC 2D）测量的产率为26%至81%（大多数发射的YOC 2D高于50%）。此外，离子温度和中子爆炸时间的测量和2D模拟之间显示出良好的一致性。模拟结果表明，时间P2和P4驱动的不对称性会降低PdV工作的效率，并增加由于电子热传导的能量损失。此外，氘（DD）燃料的内能明显下降，中子产额下降的低模式不对称性。在未来的工作中，我们将扩大圆柱形黑腔直径或使用I型黑腔来改善低模驱动的对称性，沿着测量热斑形状。
The influence of low-mode-driven asymmetry on yield degradation in shaped-pulse indirect-drive implosions has been investigated at the 100 kJ laser facility. In this work, P2- and P4-driven asymmetries were tuned by varying hohlraum gas-fill density and capsule diameter. The measured neutron yield varied from 2.1 × 109 to 7.6 × 109 and the yield measured by a 1D simulation (YOC1D) was increased from 3% to 16%. Meanwhile, considering the temporal P2- and P4-driven asymmetries, the yields measured by 2D simulations (YOC2D) were from 26% to 81% (the YOC2D of the majority of the shots was higher than 50%). Furthermore, both the ion temperature and neutron bang-time showed good agreement between the measurements and the 2D simulations. The simulations demonstrated that the temporal P2- and P4-driven asymmetries can decrease the efficiency of PdV work and increase the energy loss due to electron thermal conduction. In addition, the internal energy of the deuterium (DD) fuel clearly decreased and the neutron yield was degraded by low-mode asymmetry. In a future work, we will enlarge the cylindrical hohlraum diameter or use an I-hohlraum to improve the low-mode-driven symmetry, along with measurement of the hot-spot shape.