摘要
Low density and low convergence implosion occurs in the exploding-pusher target experiment, and generates neutrons isotropically to develop a high yield platform.In order to validate the performance of ShenGuang(SG) laser facility and test nuclear diagnostics, all 48-beam lasers with an on-target energy of 48 kJ were firstly used to drive room-temperature, DT gas-filled glass targets.The optimization has been carried out and optimal drive uniformity was obtained by the combination of beam repointing and target.The final irradiation uniformity of less than 5% on polar direct-drive capsules of 540 μm in diameter was achieved, and the highest thermonuclear yield of the polar direct-drive DT fuel implosion at the SG was 1.04 × 10^(13).The experiment results show neutron yields severely depend on the irradiation uniformity and laser timing,and decrease with the increase of the diameter and fuel pressure of the target.The thin CH ablator does not impact the implosion performance, but the laser drive uniformity is important.The simulated results validate that the cos γ distribution laser design is reasonable and can achieve a symmetric pressure distribution.Further optimization will focus on measuring the symmetry of the hot spot by self-emission imaging, increasing the diameter, and decreasing the fuel pressure.
Low density and low convergence implosion occurs in the exploding-pusher target experiment, and generates neutrons isotropically to develop a high yield platform.In order to validate the performance of ShenGuang（SG） laser facility and test nuclear diagnostics, all 48-beam lasers with an on-target energy of 48 kJ were firstly used to drive room-temperature, DT gas-filled glass targets.The optimization has been carried out and optimal drive uniformity was obtained by the combination of beam repointing and target.The final irradiation uniformity of less than 5% on polar direct-drive capsules of 540 μm in diameter was achieved, and the highest thermonuclear yield of the polar direct-drive DT fuel implosion at the SG was 1.04 × 1013.The experiment results show neutron yields severely depend on the irradiation uniformity and laser timing,and decrease with the increase of the diameter and fuel pressure of the target.The thin CH ablator does not impact the implosion performance, but the laser drive uniformity is important.The simulated results validate that the cos γ distribution laser design is reasonable and can achieve a symmetric pressure distribution.Further optimization will focus on measuring the symmetry of the hot spot by self-emission imaging, increasing the diameter, and decreasing the fuel pressure.
作者
Bo Yu
Jiamin Yang
Tianxuan Huang
Peng Wang
Wanli Shang
Xiumei Qiao
Xuewei Deng
Zhanwen Zhang
Zifeng Song
Qi Tang
Xiaoshi Peng
Jiabin Chen
Yulong Li
Wei Jiang
Yudong Pu
Ji Yan
Zhongjing Chen
Yunsong Dong
Wudi Zheng
Feng Wang
Shaoen Jiang
Yongkun Ding
Jian Zheng
余波;杨家敏;黄天晅;王鹏;尚万里;乔秀梅;邓学伟;张占文;宋仔峰;唐琦;彭晓世;陈家斌;理玉龙;蒋炜;蒲昱东;晏骥;陈忠靖;董云松;郑无敌;王峰;江少恩;丁永坤;郑坚(Laser Fusion Research Center,China Academy of Engineering Physics,Mianyang 621900,China;Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,China;IFSA Collaborative Innovation Center,Shanghai Jiao Tong University,Shanghai 200240,China)
基金
Project supported by the National Natural Science Foundation of China(Grant No.11605178)
the Science Challenging Project,China(Grant Nos.JCKY2016212A505 and TZ2016001)
