基于D3He反应产生的单能质子对ICF内爆过程的照相模拟研究

摘要

The quasi-monoenergetic beam of 14.7 MeV D3 Hefusion protons generated by laser implosion has very important application in proton radiography. Using the FLUKA Monte Carlo code, this paper simulates the diagnosis of the implosions by protons. The simulation focuses on the effect of proton number on imaging quality, proton radiography of direct-driven implosion and indirect-driven implosion, and proton radiography at different time during implosions. The result indicates that the beam of 14.7 MeV D3 He-fusion protons is quasi-monoenergetic and small sized, and can be used in the dynamic radiography of ICF implosions.%为实现单能质子对惯性约束聚变(ICF)内爆过程的诊断,使用FLUKA蒙特卡罗程序模拟分析了影响质子对内爆过程诊断的因素.通过设置不同初始质子数目,来分析质子产额对小球图像质量的影响,结果发现,要得到清晰图像,需要109的质子数.参照实验中常用的靶参数,模拟了直接驱动和间接驱动条件下的照相情况,分析了间接驱动情况下.金属腔对质子束的散射会造成内爆小球图像模糊,说明质子照相不适合间接驱动内爆.给出了一种时间分辨的质子照相方法,通过调整质子产生和内爆产生的时间差,实现了对内爆过程前后不同时刻的照相等.模拟表明,D3He反应产生的14.7 MeV的准单能质子具有的脉宽短、尺寸小的优点,可用于ICF内爆过程的动态照相.