皮秒短脉冲X射线背光诊断快点火靶丸压缩面密度  

Density diagnosis based on ps-duration-pulse X-ray backlighting for fast ignition compression

作　　者：毕碧[1] 周维民[1] 单连强[1] 魏来[1] 刘东晓[1] 张锋[1] 田超[1] 邓志刚[1] 袁宗强 王为武[1] 卢峰[1] 吴俊峰[2] 蔡洪波[2] 任国利[2] 吴凤娟[3] 李晋[1] 陈韬[1] 杨轶濛 张发强[1] 杨雷[1] 曹磊峰[1] 谷渝秋[1] Bi Bi;Zhou Weimin;Shan Lianqiang;Wei Lai;Liu Dongxiao;Zhang Feng;Tian Chao;Deng Zhigang;Yuan zongqiang;Wang Weiwu;Lu Feng;Wu Junfeng;Cai Hongbo;Ren Guoli;Wu Fengjuan;Li jin;Chen Tao;Yang Yimeng;Zhang Faqiang;Yang Lei;Cao Leifeng;Gu Yuqiu(Science and Technology on Plasma Physics Laboratory,Research Center of Laser Fusion,CAEP,Mianyang 621900,China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,China;Joint Laboratory for Extreme Conditions Matter Properties,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,等离子体物理重点实验室,四川绵阳621900 [2]北京应用物理与计算数学研究所,北京100088 [3]西南科技大学极端条件物质特性联合实验室,四川绵阳621010

出　　处：《强激光与粒子束》2020年第4期73-77,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11875048,11775202);科学挑战专题项目(TZ2018005)

摘　　要：为了给快点火集成耦合效率的计算提供关键参数,并为后期高密度压缩奠定高能背光的诊断基础,在神光-Ⅱ升级装置上利用皮秒短脉冲激光驱动产生了X射线背光源,测量了成像分辨率、光通量,获得了短脉冲背光源的辐射特性,进一步成功演示了基于这种短脉冲背光照相技术的间接驱动快点火预压缩密度诊断。实验所得图像与模拟图像结构一致,实测压缩过程中的面密度达到50 mg/cm2。实验还发现了压缩不对称引起的流体不稳定性特征,为后续实验提供了改进方向。To provide significant parameters for fast ignition coupling efficiency and density diagnosis for higher compression, a ps-duration X-ray backlighter has been produced with ps-duration laser on Shenguang-Ⅱupdated facility. The radiation properties such as backlighting image resolution and the photons arriving at the image plate have been successfully measured. Based on the conformed conditions, density diagnosis of an indirectly-driven fast ignition target using ps-duration backlighting has been carried out. The obtained short-pulse backlighting radiography shows that the imploded shell shape agrees well with that of simulation and the areal density exceeds50 mg/cm2. The short-pulse backlighting radiography also shows the hydrodynamic instability which might be caused by the asymmetric compression. Further investigations and attempts to improve implosion performance to a higher density are in progress.

关 键 词：快点火 预压缩 短脉冲背光成像 密度诊断 

分 类 号：O536[理学—等离子体物理]