论文标题
在相对论激光固体相互作用中最大化MEV X射线剂量
Maximizing MeV x-ray dose in relativistic laser-solid interactions
论文作者
论文摘要
在激光固体相互作用中产生的Bremsstrahlung X射线可以用作高能密度科学的光源。我们从粒子中和蒙特卡洛模拟中介绍电子和X射线光谱，在200 $ \，$ j的固定能量下改变激光脉冲强度和持续时间。在低强度下观察到超源性电子温度。给出了一个新的温度缩放，取决于脉搏持续时间和密度尺度的长度。短而高强度的脉冲在自构磁场发展之前会产生低差异电子束，从而导致更远前进的MEV X射线。
Bremsstrahlung x-rays generated in laser-solid interactions can be used as light sources for high-energy-density science. We present electron and x-ray spectra from particle-in-cell and Monte Carlo simulations, varying laser pulse intensity and duration at fixed energy of 200$\,$J. Superponderomotive electron temperatures are observed at low intensity; a new temperature scaling is given that depends on pulse duration and density scale length. Short, high-intensity pulses create low-divergence electron beams before self-generated magnetic fields evolve, resulting in more forward-going MeV x-rays.
