Tamping the movement of the laser absorption cutoff position using gold foam hohlraum  

作　　者：张璐 李丽灵 林稚伟 董云松 景龙飞 郑建华 况龙钰 黎航 郑金华 张继彦 宋天明 张志宇 赵阳 牛高 杨冬 杨家敏 丁永坤 Lu ZHANG;Liling LI;Zhiwei LIN;Yunsong DONG;Longfei JING;Jianhua ZHENG;Longyu KUANG;Hang LI;Jinhua ZHENG;Jiyan ZHANG;Tianming SONG;Zhiyu ZHANG;Yang ZHAO;Gao NIU;Dong YANG;Jiamin YANG;Yongkun DING(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,People’s Republic of China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,People’s Republic of China)

机构地区：[1]Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,People’s Republic of China [2]Institute of Applied Physics and Computational Mathematics,Beijing 100088,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第5期56-61,共6页等离子体科学和技术（英文版）

基　　金：supported by the Presidential Foundation of China Academy of Engineering Physics (No. YZJJLX 2018011);National Natural Science Foundation of China (Nos. 11775204, 11734013, 12105269 and 12004351)

摘　　要：In indirect-driven laser fusion experiments,the movement of the laser absorption layer will distort the radiation uniformity on the capsule.The gold foam has advantages in symmetry control and lowering wall plasma blowoff when used in an inertial confinement fusion(ICF)hohlraum.This work investigates the motion of the laser absorption cutoff position using lowdensity foam gold walls.It is found that the motion of the laser absorption cutoff position can be significantly mitigated through optimal initial low density,tailored to a specific laser shape.For a short square laser pulse,the laser absorption cutoff position remains almost stationary at an initial density of approximately 0.6 g cm^(-3).For a long-shaped laser pulse,the minimal motion of the laser absorption cutoff position is observed at an initial density of about 0.1 g cm^(-3).This approach allows for the adjustment of the symmetry of the hohlraum radiation source.The insights gained from this study serve as a crucial reference for optimizing the hohlraum wall density.

关 键 词：hohlraum symmetry laser absorption plasma blowoff gold foam 

分 类 号：TL632.1[核科学技术—核技术及应用]