摘要
使用一维多群输运程序RDMG与二维少群扩散程序LARED-S对点火靶高脚与低脚内爆进行数值模拟.相对于低熵内爆,高脚高熵内爆通过提高预脉冲的辐射温度使得烧蚀面与物质界面的流体稳定性得到明显的改善,能够抑制流体不稳定的增长与热斑混合的发展.同时,高熵设计导致燃料的压缩变差,阻滞时刻燃料的压缩密度与面密度相应降低,中子产额降低.因此,高脚高熵内爆是通过牺牲燃料的高压缩,来换取靶丸内爆流体稳定性能的改善.
High-foot high-adiabat implosion simulations of ICF ignition capsules are performed with one-dimensional multi-group radiation transport hydrodynamic code RDMG and two-dimensional few-group radiation diffusion hydrodynamic code LARED-S.Compared with low-adiabat implosion,high-foot implosions improve significantly stability of ablation front and ablator-fuel interface by increasing radiation drive temperature of the foot,leading to great reduction of hydrodynamic instability growth and hot-spot mix.Meanwhile,high-foot implosion decrease DT fuel compression. Final compression density and areal density of the main fuel at stagnation are decreased,causing lower neutron yield. A better stability of high-foot high-adiabat implosion is obtained at cost of reducing DT fuel compression.
出处
《计算物理》
CSCD
北大核心
2015年第6期662-668,共7页
Chinese Journal of Computational Physics
基金
国家自然科学基金(11105013
11205017
11371065
11575034)
国家高技术发展计划(民口863项目2012AA01A303)资助项目
关键词
惯性约束聚变
高脚高熵内爆
流体力学不稳定性
内爆压缩
inertial confinement fusion
high-foot high-adiabat implosion
hydrodynamic instability
implosion compression
