论文标题
使用多路复用激光优化固体的激光耦合，物质加热和颗粒加速度
Optimizing laser coupling, matter heating, and particle acceleration from solids using multiplexed ultraintense lasers
论文作者
论文摘要
意识到超高强度激光器对粒子和辐射产生的全部潜力将需要由于技术限制而需要多光束布置。在这里，我们研究了如何优化其与固体目标的耦合。在实验上，我们表明，在具有较大预播的固体上，将两个强烈的激光重叠在固体上，可以极大地改善目标前端的热电子的产生，而在目标背面的离子加速度。通过多维粒子中的模拟分析了基本机制，揭示了目标前沿两个激光束驱动的自诱导的磁场容易重新连接，这是一种提高电子能量的可能机制。另外，在目标散装中热电子过程中产生的电阻磁场倾向于改善其准确性。我们的模拟还表明，通过重叠两个以上的激光束可以进一步增强此类效果。
Realizing the full potential of ultrahigh-intensity lasers for particle and radiation generation will require multi-beam arrangements due to technology limitations. Here, we investigate how to optimize their coupling with solid targets. Experimentally, we show that overlapping two intense lasers in a mirror-like configuration onto a solid with a large preplasma can greatly improve the generation of hot electrons at the target front and ion acceleration at the target backside. The underlying mechanisms are analyzed through multidimensional particle-in-cell simulations, revealing that the self-induced magnetic fields driven by the two laser beams at the target front are susceptible to reconnection, which is one possible mechanism to boost electron energization. In addition, the resistive magnetic field generated during the transport of the hot electrons in the target bulk tends to improve their collimation. Our simulations also indicate that such effects can be further enhanced by overlapping more than two laser beams.
