直接驱动球内爆点火的数值模拟  

Numerical simulation of direct-drive ICF ignition in spherical geometry

作　　者：郁晓瑾[1] 叶文华[2] 吴俊峰[2] 

机构地区：[1]中国工程物理研究院研究生部,北京100088 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《强激光与粒子束》2006年第8期1297-1301,共5页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题;国家自然科学基金资助课题(10475011;10225105;10135010)

摘　　要：实现中心点火的基本条件是在内爆中心形成面密度0.3 g/cm2,温度10 keV的点火热斑。减速阶段流体不稳定性的增长,会破坏对称压缩,减小热斑体积,直接破坏点火热斑的形成,对点火构成威胁。在原有LARED-S程序的基础上,加入热核反应和α粒子加热过程程序模块,对直接驱动ICF球内爆过程进行数值模拟研究,1维模拟结果与NIF直接驱动点火靶的设计基本相符,显示α粒子加热对边缘点火起重要作用;2维模拟表明减速阶段流体不稳定性对点火有重要影响。The basic condition required for achieving central ignition is producing a hot spot with 10 keV temperature and 0.3 g/cm^2 surface density. Growth of hydrodynamic instability during deceleration phase will destroy the symmetric-drive , reduce the volume of central hot spot and make a harmful effect on ignition. Based on the LARED-S code, considering the thermonuclear reaction and a-particle heating, a numerical study of direct-drive ICF in spherical geometry is made. One-dimensional results agree well with the NIF ignition target designs, and show that the a-particle heating plays an important role in marginal ignition. Two- dimensional results show that the growth of hydrodynamic instability during deceleration phase makes a harmful effect on ignition.

关 键 词：中心点火 α粒子加热 流体不稳定性 靶能量增益 

分 类 号：O361.5[理学—流体力学] O242.1[理学—力学]