1 中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
2 北京应用物理与计算数学研究所, 北京 100088
在神光Ⅲ主机激光装置上，采用单端带激光注入孔(LEH)的桶状黑腔，利用极区分幅相机和极区附近X光条纹相机获得黑腔内壁附近和LEH附近等离子体的X射线发射时空演化图像，进而研究LEH堵孔特性。X光图像清晰地展示了激光光斑移动、LEH附近等离子体缩孔和堵孔过程，为优化LEH尺寸提供了实验依据。
黑腔 等离子体 激光注入孔 堵孔 hohlraum plasma laser entrance hole laser entrance hole closure 强激光与粒子束
2018, 30(5): 050101
Author Affiliations
Abstract
1 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
2 Research Center of Laser Fusion, Chinese Academy of Engineering Physics, Mianyang 621900, China
3 Center for Applied Physics and Technology, Peking University, Beijing 100871, China
4 Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China
5 China Academy of Engineering Physics, Mianyang 621900, China
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.
Spherical hohlraum Laser propagation Cylindrical laser entrance hole Laser spot movement Matter and Radiation at Extremes
2016, 1(1): 2
