Laser repointing scheme for octahedral spherical hohlraums on the SGIII laser facility
Author:
Cao Hui1ORCID, Xie Xufei2ORCID, Chen Yaohua1, Dong Yunsong2ORCID, Wang Liquan2, Cao Zhurong2, Chen Xu2, Wang Qiangqiang2ORCID, Zhou Wei2, Zhang Wei2, Li Zhichao2, Li Sanwei2, Deng Bo2, Hao Liang1ORCID, Li Shu1, Wu Junfeng1, Ren Guoli1ORCID, Hang Xudeng1, Huo Wenyi1ORCID, Huang Xiaoxia2, Peng Xiaoshi2, Yang Dong2ORCID, Xu Tao2, Hou Lifei2, Che Xingsen2ORCID, Guo Liang2ORCID, Du Huabing2, He Xiaoan2, Li Chaoguang2, Yang Pin2, Gu Qianqian2, Wang Yuancheng2, Zheng Kuixing2, Huang Yunbao3, Feng Bin2, Yuan Guanghui2, Jiang Baibin2, Zhang Haijun2, Wang Feng2ORCID, Yang Jiamin2ORCID, Liu Shenye2, Xie Jun2, He Zhibing2ORCID, Du Kai2, Liu Jie45ORCID, Zou Shiyang1, Ding Yongkun15ORCID, Zhu Qihua2, Lan Ke15ORCID
Affiliation:
1. Institute of Applied Physics and Computational Mathematics 1 , Beijing 100088, China 2. Research Center of Laser Fusion, Chinese Academy of Engineering Physics 2 , Mianyang 621900, China 3. Mechatronics School of Guangdong University of Technology 3 , Guangzhou 510080, China 4. Graduate School, China Academy of Engineering Physics 4 , Beijing 100193, China 5. HEDPS, Center for Applied Physics and Technology, and College of Engineering, Peking University 5 , Beijing 100871, China
Abstract
The novel octahedral spherical hohlraum can provide an ideal and practical approach for the next generation of laser systems to support both direct and indirect drive to achieve predictable and reproducible fusion gain via multiple schemes. To demonstrate its advantage in a naturally high symmetry at a cylindrically configured laser facility, it requires to repoint the laser beams to approach as close as possible the ideal octahedral beam configuration with an injection angle (the angle between a beam and the normal direction of its laser entrance hole (LEH)) ranging from 50° to 60°. We report our investigation and experiment on the optimum repointing scheme at the SGIII facility, which uses 32 beams, with 8 beams entering each polar LEH at 49.5° and 55°, and 4 beams entering each equatorial LEH at 61.5° and 62.1°. It contains residual imbalance between the polar and equatorial beams, leading to an asymmetry dominated by the spherical harmonic Y20 mode, which can be remarkably reduced by the stronger backscatters of equatorial beams. Our experiment demonstrated the feasibility of the 32-beam optimum repointing scheme and generation of 175 eV under 86 kJ inside a 2.4-mm-radius octahedral hohlraum with 0.7-mm-radius LEHs, which provided a strong support for the later experiment on proof-of-concept of octahedral spherical hohlraum [Lan et al., Phys. Rev. Lett. 127, 245001 (2021)]. 2D simulations on LEH closure agree well with the observations. This work opens a novel way of realization of a quasi-spherical irradiation at a cylindrically configured laser facility without supplementary symmetry control.
Funder
National Natural Science Foundation of China
Subject
Condensed Matter Physics
Cited by
1 articles.
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