Author Affiliations
Abstract
1 Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
2 Center for Applied Physics and Technology, Peking University, Beijing 100871, China
The non-equilibrium between ions and electrons in the hot spot can relax the ignition conditions in inertial confinement fusion [Fan et al., Phys. Plasmas 23, 010703 (2016)], and obvious ion-electron non-equilibrium could be observed by our simulations of high-foot implosions when the ion-electron relaxation is enlarged by a factor of 2. On the other hand, in many shots of high-foot implosions on the National Ignition Facility, the observed X-ray enhancement factors due to ablator mixing into the hot spot are less than unity assuming electrons and ions have the same temperature [Meezan et al., Phys. Plasmas 22, 062703 (2015)], which is not self-consistent because it can lead to negative ablator mixing into the hot spot. Actually, this non-consistency implies ion-electron non-equilibrium within the hot spot. From our study, we can infer that ionelectron non-equilibrium exists in high-foot implosions and the ion temperature could be ~9% larger than the equilibrium temperature in some NIF shots.
Ion-electron non-equilibrium Ion-electron non-equilibrium Hot-spot ignition conditions relaxation Hot-spot ignition conditions relaxation High-foot experiments High-foot experiments Matter and Radiation at Extremes
2017, 2(1): 3
1 北京应用物理与计算数学研究所, 北京 100088
2 北京大学 应用物理与技术研究中心, 北京 100871
提出通过离子-电子非平衡物理模型来降低惯性约束聚变中心热斑点火的聚变点火条件.在该物理模型中,强调离子比电子具备更高的温度,从而使得热斑的热核聚变反应增强,轫致辐射和电子热传导造成的能量漏失相对降低.通过对中心热斑的自加热分析和热斑燃烧动力学分析,发现相对于平衡聚变点火模型,非平衡模型可以显著扩大聚变点火区在热斑面密度和热斑温度空间的范围.同时采用LARED-S程序的数值模拟,研究了通过尖峰脉冲波形、二次冲击物理机制强化中心热斑聚变点火的非平衡性.
离子-电子非平衡 点火条件降低 二次冲击 尖峰脉冲波形 惯性约束聚变 ion-electron non-equilibrium ignition condition relaxation secondary shock wedged-peak pulse inertial confinement fusion LARED-S LARED-S 强激光与粒子束
2015, 27(8): 082001
