超强激光-纳米丝靶相互作用过程中纳米丝结构演化的研究

The evolution of nanowire structure in the interaction process of ultra-intense laser pulses with nanowire target

纳米丝靶的特殊结构对于超强激光与纳米丝靶相互作用产生高品质的超热电子和高能离子有非常重要的作用.文中利用粒子模拟(Particle-in-cell,PIC)方法研究了超强激光与碳纳米丝靶相互作用过程中纳米丝结构随时间的演化过程,理论分析了纳米丝内部自生电磁场的产生机制和离子在纳米丝靶内部的运动过程,研究结果表明,纳米丝靶内部会产生100 MG量级的自生磁场和1013 V·m^(-1)量级的静电场.在激光和自生电磁场的作用下碳纳米丝靶结构能够保持完整性的时间大约为50~100 fs,100 fs后,纳米丝靶的结构会被逐渐破坏.该研究对超强激光与纳米丝靶相互作用的相关理论和实验有重要的参考价值.

The special structure of the nanowire target plays a very important role in the interaction between the ultra-intense laser pulse and the nanowire target to produce high-quality hot electrons and high-energy ions.In this paper,the evolution of the nanowire structure over time has been studied in detail by using the 2D PIC simulation method.The generation mechanism of the electromagnetic field inside the nanowire has been studied by theoretical analysis.The movement of ions inside the nanowire target has been studied by the theoretical analysis and numerical simulation method.The results show that the self-generated magnetic field of the order of 100 MG and the electronic static field of the order of 1013 V·m^(-1)are generated inside the nanowire target.In laser and self-generated electromagnetic field,the time for the structure of the nanowire target to maintainits integrity is approximately with in 50~100 fs.And beyond 100 fs,the structure of the nanowire target will be gradually destroyed.The research has important reference value for the related theories and experiments of the interaction between ultra-intense laser and nanowire target.