论文标题
千焦耳picsecond激光相互作用与接近临界密度等离子体的跨丝丝随机加速度
Cross-Filament Stochastic Acceleration of Electrons in Kilojoule Picosecond Laser Interactions with Near Critical Density Plasmas
论文作者
论文摘要
了解KiloJoule，Picsecond激光脉冲具有长度长度前期或近期临界密度（NCD）等离子体的相互作用对于指导国家短脉冲激光设施的指导实验至关重要。使用完整的三维粒子中的粒子模拟，我们证明了在这个方案中，跨丝丝状加速度是一种重要机制，有助于产生超底磁性，高频率电子束。由于激光功率显着超过相对论自我关注的阈值，因此产生了多个细丝，并且可以在很长的距离内独立地传播。在加速期间，电子跳过细丝，它们的运动随机。我们发现，电子的有效温度随着缩放量表之后的总交互时间的增加而增加，例如$ t _ {\ rm eff} \proptoτ_{i}^{0.65} $。通过辐照亚毫米厚的NCD目标，能量以上2.5 meV的电子电荷达到数十美元的$ $ c。这种具有超底瘤能量的高速通量电子显着促进了在高能密度科学，核科学，次要来源和诊断技术中的应用。
Understanding the interaction of kilojoule, picosecond laser pulse with long-scale length preplasma or homogeneous near critical density (NCD) plasma is crucial for guiding experiments at national short-pulse laser facilities. Using full three-dimensional particle-in-cell simulations, we demonstrate that in this regime, cross-filament stochastic acceleration is an important mechanism that contributes to the production of superponderomotive, high-flux electron beams. Since the laser power significantly exceeds the threshold of the relativistic self-focusing, multiple filaments are generated and can propagate independently over a long distance. Electrons jump across the filaments during the acceleration, and their motion becomes stochastic. We find that the effective temperature of electrons increases with the total interaction time following a scaling like $T_{\rm eff}\proptoτ_{i}^{0.65}$. By irradiating a submillimeter thick NCD target, the space charge of electrons with energy above 2.5 MeV reaches tens of $μ$C. Such high-flux electrons with superponderomotive energies significantly facilitate applications in high-energy-density science, nuclear science, secondary sources and diagnostic techniques.
