离子-电子非平衡机制降低中心热斑点火条件

An ion-electron non-equilibrium model for relaxing central hot-spot ignition conditions

提出通过离子-电子非平衡物理模型来降低惯性约束聚变中心热斑点火的聚变点火条件。在该物理模型中,强调离子比电子具备更高的温度,从而使得热斑的热核聚变反应增强,轫致辐射和电子热传导造成的能量漏失相对降低。通过对中心热斑的自加热分析和热斑燃烧动力学分析,发现相对于平衡聚变点火模型,非平衡模型可以显著扩大聚变点火区在热斑面密度和热斑温度空间的范围。同时采用LARED-S程序的数值模拟,研究了通过尖峰脉冲波形、二次冲击物理机制强化中心热斑聚变点火的非平衡性。

This paper presents an ion-electron non-equilibrium model for relaxing the central hot-spot ignition conditions in inertial confinement fusion.The model emphasizes that the hot-spot ion temperature is higher than its electron temperature,so that the hot-spot nuclear reactions are enhanced and its energy leaks from radiation bremsstrahlung and electron conduction are relatively reduced.Both the hot-spot self-heating analysis and a more comprehensive hot-spot ignition-and-burn dynamics analysis show that as compared with the commonly used equilibrium model,the ignition region would be significantly enlarged in the hotspotρR-Tspace.Simulations are also done using the LARED-S code to show that a tuned radiation-drive wedged-peak pulse,which creates a secondary shock,could be utilized to enhance hot-spot non-equilibrium.