laser烧蚀等离子体中无碰撞静电shock wave中密度隆起的形成
Density bump formation in a collisionless electrostatic shock wave in a laser-ablated plasma
摘要：
实验观察到飞秒激光烧蚀铝箔时，在无碰撞静电冲击波的前端出现密度隆起。我们已经进行了数值模拟的动力学的这种现象的发展，同时产生的一个包的离子声波，暴露于一个持续流动的高能电子，在无碰撞等离子体。我们提出了所观察到的效果的物理解释，并表明，凸块由过境粒子，即，从致密的等离子体层的加速离子，和稀释的背景等离子体，由纳秒激光预脉冲在烧蚀过程中形成的离子。
英文摘要：
The emergence of a density bump at the front of a collisionless electrostatic shock wave have been observed experimentally during the ablation of an aluminium foil by a femtosecond laser pulse. We have performed numerical simulations of the dynamics of this phenomena developing alongside the generation of a package of ion-acoustic waves, exposed to a continual flow of energetic electrons, in a collisionless plasma. We present the physical interpretation of the observed effects and show that the bump consists of transit particles, namely, the accelerated ions from the dense plasma layer, and the ions from the diluted background plasma, formed by a nanosecond laser prepulse during the ablation.
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