爆推快点火模型分析

使用简单的爆推模型估算爆推快点火过程及其结果。 首先由ns级主驱动激光直接驱动，形成中心低密度高温热斑，周围为高密度低温主燃料区, 两区压力平衡(等压模型)；然后用ps级超短超强激光打入，产生超热电子，其能量在低温主燃料区沉积，主燃料区发生爆炸，一部分向外飞散，一部分向内压缩中心热斑。在这个爆推模型下，热斑体积压缩比为64，中子产率将有极大的提高，相应的中子产额和能量增益得到提高。离子温度因为主燃料区质量过大，提高不大。提高超热电子能量，或者减小低温主燃料区质量，离子温度将会显著提高。不同的初始离子温度对结果有很大影响，较低的初始温度下更容易得到较高的中子产率和产额。

Model of fast ignition by exploding push

In fast ignition mode by exploding push, the fuel is first compressed by a conventional inertial confinement fusion driver, producing a low density hotspot surrounded by a relatively cold and dense main fuel region, and then a short (about 10 ps) pulse, high-power laser is injected, the suprathermal electrons heat the cold region, and the cold shell explodes, compressing and heating the hot-spot. The analysis in this paper shows that the compressing rate of hot-spot is 64, neutron yield is about two orders of magnitude greater than before, and the energy gain is 3 times increased. But the ion temperature is increased slightly, for the mass of cold region is too large. If the mass of cold region is decreased or the energy of relativistic electrons is increased above 10 kJ, the rise of ion t