超强激光与微结构靶相互作用的非线性物理过程研究

超强激光与等离子体的能量耦合对超强激光驱动高效的粒子加速及其辐射至关重要，微结构靶是目前大幅提升激光能量转换效率的最有效方法之一。本项目利用理论分析和粒子模拟系统研究超强激光与微结构靶相互作用的非线性动力学过程，获得激光能量吸收、表面等离子体波激发、超热电子和高能离子产生的定量描述，并讨论前表面微结构的周期变化对离子加速效果的影响；建立基于等离子体波导的电子加速理论模型，优化激光和靶结构参数以大幅提升离子束能量及X射线辐射强度，为未来开展的相关实验研究提供理论参考和模型支撑。

Coupling of ultra-intense laser and plasma is of very great concern to efficient particle acceleration and radiation driven by ultraintense laser pulses, micro-structured target is a most effective method to significantly improve the energy conversion efficiency of the laser. The nonlinear dynamic in the interaction between ultra-intense laser and micro-structured target is investigated theoretically and by using particle-in-cell simulations. We will obtain the quantitative description among the energy absorption of the laser, excitation of surface plasma wave and generation of hot electrons and energetic ions, and discuss the effect of the modulated period of the micro-structure targets on the ion acceleration. Besides, the theoretical model of plasma waveguide electron acceleration will be built for the optimized parametric design of the micro-channel to enhance the ionic energy and X-ray radiation, which is useful for the experiments in future.