Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA.
Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375, USA.
Phys Rev Lett. 2019 Aug 9;123(6):065001. doi: 10.1103/PhysRevLett.123.065001.
Using highly resolved 3D radiation-hydrodynamic simulations, we identify a novel mechanism by which the deleterious impact of laser imprinting is mitigated in direct-drive inertial confinement fusion. Unsupported shocks and associated rarefaction flows, commonly produced with short laser bursts, are found to reduce imprint modulations prior to target acceleration. Optimization through the choice of laser pulse with picket(s) and target dimensions may improve the stability of lower-adiabat designs, thus providing the necessary margin for ignition-relevant implosions.
利用高分辨率的 3D 辐射流体动力学模拟，我们发现了一种新的机制，这种机制可以减轻直接驱动惯性约束聚变中激光标记的有害影响。研究发现，与短激光脉冲一起产生的未支撑激波和相关的稀疏流会在目标加速之前减小印记调制。通过选择带有隔离物（多个）的激光脉冲和目标尺寸进行优化，可能会提高较低焓值设计的稳定性，从而为点火相关的内爆提供必要的裕度。
