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Study of the kinetic effects in indirect-drive inertial confinement fusion hohlraums
High Energy Density Physics ( IF 1.6 ) Pub Date : 2020-03-09 , DOI: 10.1016/j.hedp.2020.100756
H.B. Cai , L.Q. Shan , Z.Q. Yuan , W.S. Zhang , W.W. Wang , C. Tian , F. Zhang , J. Teng , S.Q. Yang , Q. Tang , Z.F. Song , J.B. Chen , W.M. Zhou , Y.Q. Gu , B.H. Zhang , S.P. Zhu , X.T. He

Kinetic physics has the potential to impact the performance of indirect-drive inertial confinement fusion (ICF) experiments. In near vacuum hohlraums (or vacuum hohlraums), the high-Z plasma expands from the hohlraum wall and collides with the blow-off from the capsule (or the low-density fill-gas). Such collision produces conditions in which kinetic effects may dominate since the ion-ion mean free paths are larger than the size of the interaction region. In the present work, we present the experimental evidence supported by simulations of kinetic effects launched in the interpenetration layer between the laser-driven hohlraum plasma bubbles and the corona plasma of the compressed pellet on the Shenguang-III prototype laser facility. Our study showed kinetic shocks arisen in the hohlraum wall/ablator (or the low-density fill-gas) interpenetration region, which result in efficient acceleration of high energy ions. When these high energy ions were deposited inside the capsule, it resulted in significant low-mode asymmetry of the implosion capsule since there are no high energy ions from the laser entrance holes. These studies provide novel insight into the interactions and dynamics of a vacuum hohlraum and near vacuum hohlraum.



中文翻译:

间接驱动惯性约束聚变圆管的动力学效应研究

动力学物理学有可能影响间接驱动惯性约束聚变(ICF)实验的性能。在近乎真空的真空罩(或真空真空罩)中,高Z等离子体从真空罩壁膨胀并与胶囊(或低密度填充气体)的吹出物碰撞。由于离子-离子的平均自由程大于相互作用区域的大小,因此这种碰撞产生了动力学效应可能占主导的条件。在目前的工作中,我们提供了由神光三号原型激光设备上的激光驱动的全息等离子体气泡与压缩颗粒的电晕等离子体之间的互穿层中的动力学效应模拟所支持的实验证据。我们的研究表明,在大气压壁/消融器(或低密度填充气体)互穿区域中产生了动力学冲击,从而导致了高能离子的有效加速。当这些高能离子沉积在胶囊内部时,由于没有来自激光入射孔的高能离子,导致内爆胶囊的明显的低模不对称性。这些研究提供了关于真空大气压球和接近真空大气压球的相互作用和动力学的新颖见解。

更新日期:2020-03-09
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