直接驱动球内爆点火的数值模拟
Numerical simulation of direct-drive ICF ignition in spherical geometry
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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。Abstract: The basic condition required for achieving central ignition is producing a hot spot with 10 keV temperature and 0.3 g/cm2 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 α-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 α-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.
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Key words:
- central ignition /
- α-particle heating /
- hydrodynamic instability /
- target energy gain
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