论文标题
激光湍流中的电子加速度
Electron acceleration in laser turbulence
论文作者
论文摘要
我们证明，在空间不均匀，强烈的激光场中，电子可以有效地加速到高能。当完美的平面波从随机扰动的表面反射出来时，激光非均匀性就会发生。通过求解随机扰动激光的电磁场中的三维颗粒轨迹，我们能够产生具有高于浮子缩放的温度的电子能谱，如许多实验所观察到的那样。模拟表明，仅激光场就可以实现高电子能量，而无需等离子体场。电子光谱的特征温度取决于激光场湍流的特征。该过程非常迅速，发生在10-50FS的时间尺度上，表明当强度在相对论阈值下方或低于相对论阈值时，短脉冲激光 - 固体相互作用可能是主要的加速机制。一个简单的分析模型表明，通过在短时间内在激光小波中重复加速，电子如何达到高能。
We demonstrate that electrons can be efficiently accelerated to high energy in spatially non-uniform, intense laser fields. Laser non-uniformities occur when a perfect plane wave reflects off a randomly perturbed surface. By solving for three-dimensional particle trajectories in the electromagnetic field of a randomly perturbed laser, we are able to generate electron energy spectra with temperatures well above the ponderomotive scaling, as observed in many experiments. The simulations show that high electron energies can be achieved by the laser fields alone, without the need for plasma fields. The characteristic temperatures of the electron spectra are determined by the characteristic features of the laser field turbulence. The process is very rapid, occurring on 10-50fs timescales, indicating it is likely a dominant acceleration mechanism in short-pulse laser-solid interactions when the intensity is at or below the relativistic threshold. A simple analytic model shows how electrons can reach high energy by undergoing repeated acceleration in laser wavelets for short periods of time.
