高空核爆炸早期碎片等离子体模拟

Plasma Simulation for Early-Stage Debris in High Altitude Nuclear Explosions

针对高空核爆炸早期碎片等离子体模拟,提出了高空核爆炸等离子体演化过程必须经历的4个阶段,包括链式反应阶段、早期过渡期、非平衡碰撞期和非平衡无碰撞期。在此基础上,给出了用于描述早期过渡期、非平衡碰撞期和非平衡无碰撞期3个阶段的适用模型和基本方程:早期过渡期适用相对论性多温流体,用相对论性流体方程描述;非平衡碰撞期适用相对论性碰撞等离子体,用相对论性玻尔兹曼-麦克斯韦耦合方程描述;非平衡无碰撞期适用非相对论性无碰撞等离子体,用流体-PIC(particle-in-cell)混合模拟描述。

In this paper,four different stages that must be experienced in plasma evolution process of early-stage debris in the high altitude nuclear explosion are proposed,that is,chain-reaction stage,early transition stage,non-equilibrium collision plasma stage,and non-equilibrium collision-free plasma stage.On this basis,applicable models and basic equations for describing the early transition period,the non-equilibrium collision period,and non equilibrium collision-free period are provided.For example,in the early transitional period,relativistic multi-temperature fluids can be described by using relativistic fluid equations.The non-equilibrium collision period is applicable to relativistic collision plasmas,described by using the relativistic Boltzmann-Maxwell coupling equation.The non-equilibrium collision-free period is applicable to non relativistic collision free plasma,which can be described by fluid-PIC(particle-in-cell)hybrid simulation.