论文标题
从相对论强度下的激光辐射近临界密度双层目标的电子和X射线光谱的同时测量
Simultaneous measurements on the electron and X-ray spectra from laser-irradiated near-critical-density double-layer targets at relativistic intensity
论文作者
论文摘要
我们报告了从相对论的飞秒脉冲以5E19 w/cm^2的强度照射的近临界密度（NCD）双层目标对电子和X射线光谱的实验结果。研究了电子和X射线光谱对NCD层的密度和厚度的依赖性。对于最佳靶标，获得了温度为5.5 MeV和X射线的电子，临界能量为5 keV。基于实验参数的2D粒子模拟通过直接激光加速在等离子体通道中加速电子，导致温度明显高于蓬松的温度。明亮的X射线是由Betatron发射产生的，在电子离开双层目标之前，汤姆森的反向散射产生。
We report the experimental results of simultaneous measurements on the electron and X-ray spectra from near-critical-density (NCD) double-layer targets irradiated by relativistic femtosecond pulses at the intensity of 5E19 W/cm^2. The dependence of the electron and X-ray spectra on the density and thickness of the NCD layer was studied. For the optimal targets, electrons with temperature of 5.5 MeV and X-rays with critical energy of 5 keV were obtained. 2D particle-in-cell simulations based on the experimental parameters confirm the electrons are accelerated in the plasma channel through direct laser acceleration, resulting in temperature significantly higher than the pondermotive temperature. Bright X-rays are generated from betatron emission and Thomson backscattering before the electrons leave the double-layer targets.
