靶结构对激光等离子体动量耦合系数的影响

Effects of target configuration on the laser plasma momentum-coupling coefficient

强激光与靶相互作用产生的等离子体可以作为一种新型的推进源.就强激光与靶相互作用过程中,靶结构对激光等离子体动量耦合系数的影响进行了研究.结果表明,相对于无约束的平面靶,坑靶将动量耦合系数提高了5倍,而约束的平面靶将动量耦合系数提高了10倍以上.分析发现,对等离子体的有效约束是提高动量耦合系数的主要原因.

The plasmas generated in the laser interacting with targets can be used as a new propulsive source. In this paper, the effects of the target configuration on the laser plasma momentum-coupling coefficient are investigated. Results show that, compared with planar targets, the momentum-coupling coefficient is enhanced five times by the cavity target, and over ten times for the confined planar target. It is found that effectively confined plasma expansion is the main reason for the enhancement of the momentum- coupling coefficient.