7~8 MA条件下MagLIF集成实验关键问题理论研究与设计  

Theoretical research on key issues and design of integrated MagLIF experiments on the 7-8 MA facility

作　　者：肖德龙[1] 王小光 王冠琼 毛重阳 孙顺凯[1] Xiao Delong;Wang Xiaoguang;Wang Guanqiong;Mao Chongyang;Sun Shunkai(Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)

机构地区：[1]北京应用物理与计算数学研究所,北京100094

出　　处：《强激光与粒子束》2023年第2期27-38,共12页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(12175022,11775032,51790522)。

摘　　要：针对国内7~8 MA脉冲功率装置驱动条件,通过耦合等效电路模型和McBride等人发展的半解析模型,研究了MagLIF总体能量学过程及中子产额随关键参数的变化规律,获得了中子产额大于1010的参数设计区间。结果表明:7~8 MA驱动条件、套筒材料、负载高度、燃料半径与密度、预热能量、外加轴向磁场等多因素共同决定了燃料的最终压缩状态;预热能量越大,燃料初始升温以及滞止时刻升温越高,中子产额越高;轴向磁场增加,热传导能量损失减小,但燃料收缩比也会减小,因此存在优化轴向磁场以获得较高中子产额;杂质质量分数超过10%,中子产额开始显著下降。燃料密度0.7 mg/cm^(3)、外加轴向磁场27 T、预热能量200 J、杂质质量分数小于50%的条件下,可以获得3.5×10^(10)中子产额,从而有望在7~8 MA条件下建立MagLIF关键问题研究平台。Magnetized Liner Inertial Fusion(MagLIF)is one of the possible configurations to reach ignition.For future ignition validation,it is necessary to explore key issues of MagLIF and seek an optimal design of integrated MaglIF experiments on the low current generators.In this paper,a simplified circuit model is coupled to the semi-analytical model developed by McBride et al.to investigate key issues of integrated MagLIF experiments possibly conducted on the 7-8 MA facility in China,and parameter domain to attain over 1010neutron yield is explored.Theoretical results show that many factors together determine the final neutron yield,such as the 7-8 MA current,the liner material,the initial radius and density of D2fuel,the load height,the preheating energy,the applied axial magnetic field,as well as the fuel mixing.As the preheating energy is increased,the fuel temperature before implosion and at stagnation becomes higher,thus generating higher neutron output.The neutron yield will increase first and then decrease with the applied axial magnetic field,mainly caused by the compromise of reducing the conduction loss and decreasing the fuel convergence.When the mass ratio of impurity is higher than 10%,the neutron yield will be decreased remarkably.If an initial fuel density of 0.7 mg/cm^(3),an axial magnetic field of 27 T,and a preheating energy of 200 J in the case of 7-8 MA are used,3.5×10^(10)neutrons can be produced with the convergence lower than 20 considering 50%fuel mixing.It is thus anticipated that the research platform on key physics of MagLIF can be developed in the case of 7-8 MA drive current.

关 键 词：Z箍缩 磁化套筒惯性聚变 脉冲功率装置 中子产额 预加热 预磁化 

分 类 号：O532[理学—等离子体物理]