高等离子体密度区域的光子加速现象

摘要

The transmitted spectrum of the laser in a wakefield acceleration experiment is studied.The plasma is in high density region.The spectrum broadening and splitting at the laser frequency, as a result of the photon acceleration still can be measured.To explain the underlying physics mechanics, the particle-in-cell simulations are carried out.The experiment results combined with the particle-in-cell simulations demonstrate that the laser photons can experience acceleration or deceleration in the excited wakefield, even in high density region.%我们测量了激光尾波场加速实验的透射光谱.与之前实验所不同的是,我们所采用的等离子体密度偏高.透射光谱同样呈现出低密度等离子体中光子加速现象的的两个明显特征,光谱加宽和频谱分裂.为了解释该现象,我们利用粒子模拟程序作了模拟计算,计算结果同样证实了高密度等离子体中只要有尾波场激发,同样能产生光子加速现象.利用该现象,为我们优化激光尾波场加速提供了一种新的方法.