Lan Ke, Dong Yunsong, Wu Junfeng, Li Zhichao, Chen Yaohua, Cao Hui, Hao Liang, Li Shu, Ren Guoli, Jiang Wei, Yin Chuansheng, Sun Chuankui, Chen Zhongjing, Huang Tianxuan, Xie Xufei, Li Sanwei, Miao Wenyong, Hu Xin, Tang Qi, Song Zifeng, Chen Jiabin, Xiao Yunqing, Che Xingsen, Deng Bo, Wang Qiangqiang, Deng Keli, Cao Zhurong, Peng Xiaoshi, Liu Xiangming, He Xiaoan, Yan Ji, Pu Yudong, Tu Shaoyong, Yuan Yongteng, Yu Bo, Wang Feng, Yang Jiamin, Jiang Shaoen, Gao Lin, Xie Jun, Zhang Wei, Liu Yiyang, Zhang Zhanwen, Zhang Haijun, He Zhibing, Du Kai, Wang Liquan, Chen Xu, Zhou Wei, Huang Xiaoxia, Guo Huaiwen, Zheng Kuixing, Zhu Qihua, Zheng Wanguo, Huo Wen Yi, Hang Xudeng, Li Kai, Zhai Chuanlei, Xie Hui, Li Lingxiao, Liu Jie, Ding Yongkun, Zhang Weiyan
Institute of Applied Physics and Computational Mathematics, Beijing 100094, China.
HEDPS, Center for Applied Physics and Technology, and College of Engineering, Peking University, Beijing 100871, China.
Phys Rev Lett. 2021 Dec 10;127(24):245001. doi: 10.1103/PhysRevLett.127.245001.
In inertial confinement approaches to fusion, the asymmetry of target implosion is a major obstacle to achieving high gain in the laboratory. A recently proposed octahedral spherical hohlraum makes it possible to naturally create spherical target irradiation without supplementary symmetry control. Before any decision is made to pursue an ignition-scale laser system based on the octahedral hohlraum, one needs to test the concept with the existing facilities. Here, we report a proof-of-concept experiment for the novel octahedral hohlraum geometry on the cylindrically configured SGIII laser facility without a symmetry control. All polar and equatorial self-emission images of the compressed target show a near round shape of convergence ratio 15 under both square and shaped laser pulses. The observed implosion performances agree well with the ideal spherical implosion simulation. It also shows limitations with using the existing facilities and adds further weight to the need to move to a spherical port geometry for future ignition laser facilities.
在惯性约束聚变方法中，靶丸内爆的不对称性是在实验室实现高增益的主要障碍。最近提出的八面体球形黑腔使得无需额外的对称性控制就能自然地实现对球形靶丸的辐照。在决定基于八面体黑腔研发点火规模的激光系统之前，需要利用现有设施对这一概念进行测试。在此，我们报告了在圆柱形配置的神光III激光装置上进行的、无需对称性控制的新型八面体黑腔几何结构的概念验证实验。在方形和整形激光脉冲下，压缩靶丸的所有极向和赤道向自发射图像均显示出收敛比为15的近似圆形。观察到的内爆性能与理想的球形内爆模拟结果吻合良好。这也显示了利用现有设施的局限性，并进一步凸显了未来点火激光设施采用球形端口几何结构的必要性。
