First demonstration of improving laser propagation inside the spherical hohlraums by using the cylindrical laser entrance hole

Matter and Radiation at Extremes - Tập 1 - Trang 2-7 - 2016
Wenyi Huo1, Zhichao Li2, Dong Yang2, Ke Lan1,3,4, Jie Liu1,3,4, Guoli Ren1, Sanwei Li2, Zhiwen Yang2, Liang Guo2, Lifei Hou2, Xuefei Xie2, Yukun Li2, Keli Deng2, Zheng Yuan2, Xiayu Zhan2, Guanghui Yuan2, Haijun Zhang2, Baibin Jiang2, Lizhen Huang2, Kai Du2
1Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
2Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China
3Center for Applied Physics and Technology, Peking University, Beijing 100871, China
4Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China

Tóm tắt

The octahedral spherical hohlraums have natural superiority in maintaining high radiation symmetry during the entire capsule implosion process in indirect drive inertial confinement fusion. While, in contrast to the cylindrical hohlraums, the narrow space between the laser beams and the spherical hohlraum wall is usually commented. In this Letter, we address this crucial issue and report our experimental work conducted on the SGIII-prototype laser facility which unambiguously demonstrates that a simple design of cylindrical laser entrance hole (LEH) can dramatically improve the laser propagation inside the spherical hohlraums. In addition, the laser beam deflection in the hohlraum is observed for the first time in the experiments. Our 2-dimensional simulation results also verify qualitatively the advantages of the spherical hohlraums with cylindrical LEHs. Our results imply the prospect of adopting the cylindrical LEHs in future spherical ignition hohlraum design.

Tài liệu tham khảo

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