Z-FFR聚变靶室物理状态分析与聚变X射线防护的初步设计

Physical evolutions in fusion chamber of Z-FFR and preliminary design of fusion X-ray mitigation

利用MULTI程序建立了大空间-时间尺度、Z-FFR聚变靶室气体氛围的辐射流体力学模型,研究了聚变X射线能量传输、气体氛围温度密度演化以及冲击波的形成和传播等物理过程,获得了第一壁表面辐射温度、冲击压力随时间的变化等重要参数。同时利用Geant4程序计算了静态X射线在第一壁耐烧蚀涂层中的能量沉积分布,研究了不同能量X射线在聚变靶室气氛中的衰减规律。综合动态和静态计算结果,完成了聚变X射线防护初步设计,确定第一壁入射X射线能量密度阈值约为0.2J/cm2,Ar气氛围压强为2000Pa。

A radiation hydrodynamic model of the atmosphere in the fusion chamber of Z-FFR is built by MULTI,and the physical processes in the atmosphere such as the X-ray radiation transport,gas temperature and density evolutions,as well as shock wave generating and propagating,are studied.Radiative temperature and impact pressure on surface of the first wall are subsequently obtained.Static calculations of the X-ray deposition in tungsten and the X-ray attenuation in the Ar atmosphere are accomplished by a Geant4 code.Combining the dynamic and static calculations,preliminary design of the fusion X-ray mitigation is accomplished.The X-ray fluence threshold incident on surface of the first wall is determined to be 0.2J/cm2,and the initial pressure of the Ar atmosphere is 2000 Pa.