Experimental and simulation studies of thermal transport based on plasma flow motion in laser-ablated dense regions of Au and CH  

作　　者：Yuxue Zhang Bo Qing Yang Zhao Tianming Song Zhiyu Zhang Gang Xiong Chengwu Huang Tuo Zhu Min Lv Yan Zhao Jiyan Zhang Jiamin Yang 

机构地区：[1]Research Center of Laser Fusion,China Academy of Engineering Physics,P.O.Box 919-986,Mianyang 621900,China

出　　处：《Matter and Radiation at Extremes》2022年第4期40-49,共10页极端条件下的物质与辐射（英文）

基　　金：the National Key R&D Program of China under Grant No.2017YFA0403200;the National Nature Science Foundation(NSFC)of China under Grant Nos.12005206,11734013,11774321,and 12004351;the Science Challenge Project under Grant Nos.TZ2018001 and TZ2018005;the CAEP foundation under Grant Nos.YZJLX2017010 and 2018011;the foundation for Development of Science and Technology of the China Academy of Engineering Physics under Grant No.CX2019023.

摘　　要：A practical experimental method is proposed to investigate thermal transport by characterizing the motion of plasma flows through a x-ray spectroscopic technique using tracers.By simultaneously measuring multiple parameters,namely,the mass-ablation rate,the temporal evolution of plasma flow velocities and trajectories and the temperature,it is possible to observe a variety of physical processes,such as shock wave compression,heating by thermal waves,and plasma thermal expansion,and to determine their relative importance in different phases during the irradiation of CH and Au targets.From a comparison with hydrodynamic simulations,we find significant differences in the motion of the plasma flows between CH and Au,which can be attributed to different sensitivities to the thermal transport process.There are also differences in the ablation and electron temperature histories of the two materials.These results confirm that velocities and trajectories of plasma motion can provide useful evidence in the investigation of thermal conduction,and the approach presented here deserves more attention in the context of inertial confinement fusion and high-energy-density physics.

关 键 词：thermal TRANSPORT MOTION 

分 类 号：O53[理学—等离子体物理]