激光聚变冲击波点火的热斑形成机制

通过对冲击波点火内爆过程的数值模拟分析点火热斑压缩及形成机制。分析了传统中心点火的内爆过程,热斑主要经历冲击波压缩和惯性压缩过程,点火主要通过惯性压缩来实现。并仔细分析了冲击波点火的内爆压缩过程,从内爆角度来看冲击波点火并不是压缩和点火分开的两步过程,点火冲击波实际参与压缩过程,点火冲击波对热斑的直接影响很有限,热斑仍然主要通过壳层的惯性压缩实现点火。利用惯性压缩的定标关系及冲击波碰撞对壳层影响规律分析了热斑增压的物理机制,冲击波点火是通过点火冲击波与回冲击波的碰撞来提高壳层的密度,从而实现热斑压力的提升。

Forming mechanism of hot spot in shock ignition scheme to laser fusion

In this article, the compressing and forming mechanism of hot spot in the implosion of shock ignition is analyzed using the method of simulation. Firstly, the implosion of conventional central ignition is discussed. The hot spot experiences shock compression and inertial compression in conventional central ignition, and ignition is achieved mainly by inertial compression. Then, the implosion of shock ignition is analyzed in detail. Shock ignition is not a two-step scheme that the assembly of the fuel is separated from ignition. Ignition is simultaneous with assembly. The ignitor shock participates in the assembly and has little direct impact on the hot spot. Ignition is still mainly achieved by inertial compression in shock ignition. Finally, the physical mechanism of the hot spot pressure improvement is analyzed according to the hot spot pressure scaling law of inertial compression and the impact of shock collision on the shell. The improvement of hot spot pressure results from the enhancement of shell density due to the collision of the ignitor shock and the return shock in the shell.