The importance of Righi-Leduc heat flux to the ablative Rayleigh-Taylor instability during a laser irradiating targets  

作　　者：Ye Cui Xiao-Hu Yang Yan-Yun Ma Guo-Bo Zhang Bi-Hao Xu Ze-Hao Chen Ze Li Fu-Qiu Shao Jie Zhang 

机构地区：[1]Department of Nuclear Science and Technology,National University of Defense Technology,Changsha,China [2]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha,China [3]Department of Physics,National University of Defense Technology,Changsha,China [4]Key Laboratory for Laser Plasmas(Ministry of Education),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai,China [5]Collaborative Innovation Centre of IFSA,Shanghai Jiao Tong University,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2024年第3期9-19,共11页高功率激光科学与工程（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12175309,11975308,12005297 and 12275356);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDA25050200 and XDA25010100);Xiao-Hu Yang acknowledgesfinancial support from the Fund for NUDT Young Innovator Awards(Grant No.20180104);the Defense Industrial Technology Development Program(Grant No.JCKYS2023212807);Guo-Bo Zhang acknowledgesfinancial support from the Fund for the Research Project of NUDT(Grant No.ZK21-12)。

摘　　要：The Righi±Leduc heat flux generated by the self-generated magnetic field in the ablative Rayleigh±Taylor instability driven by a laser irradiating thin targets is studied through two-dimensional extended-magnetohydrodynamic simulations.The perturbation structure gets into a low magnetization state though the peak strength of the self-generated magnetic field could reach hundreds of teslas.The Righi±Leduc effect plays an essential impact both in the linear and nonlinear stages,and it deflects the total heat flux towards the spike base.Compared to the case without the self-generated magnetic field included,less heat flux is concentrated at the spike tip,finally mitigating the ablative stabilization and leading to an increase in the velocity of the spike tip.It is shown that the linear growth rate is increased by about 10%and the amplitude during the nonlinear stage is increased by even more than 10%due to the feedback of the magnetic field,respectively.Our results reveal the importance of Righi±Leduc heat flux to the growth of the instability and promote deep understanding of the instability evolution together with the self-generated magnetic field,especially during the acceleration stage in inertial confinement fusion.

关 键 词：AMPLITUDE linear growth rate Rayleigh-Taylor instability Righi-Leduc heat flux self-generated magnetic field 

分 类 号：O53[理学—等离子体物理] TN24[理学—物理]