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

Wenyi Huo, Zhichao Li, Dong Yang, Ke Lan, Jie Liu, Guoli Ren, Sanwei Li, Zhiwen Yang, Liang Guo, Lifei Hou, Xuefei Xie, Yukun Li (+15 others)
2016 Matter and Radiation at Extremes  
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
more » ... 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.
doi:10.1016/j.mre.2016.02.001 fatcat:x5tyrqeb4fa3zdev7c4fgvmidq