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在关于激光尾场加速(LWFA)的很多文献中,都暗示了尾场有周期性结构.可是激光驱动尾场可以不是周期性的,尾场第一周期可以捕获和加速外来电子束.Esirkepov和Bulanov等人提出了带电粒子在激光高斯脉冲驱动尾场第一周期加速的处理方法.本文在此理论基础上进一步讨论电子在尾场第一周期中能获得的最大能量与激光脉冲的强度和脉冲的波长之间的关系.结果显示,捕获电子最大能量与脉冲激光强度成正比.适当的选择脉冲激光波长也直接影响到捕获电子的最大能量值.
In many literatures about laser wake acceleration (LWFA), both suggest that there is a periodic structure in the wake field, but the laser-driven wakefield may not be periodic and the first period of the wakefield can capture and accelerate external electron beams.Esirkepov and Bulanov et al. Proposed a method to process charged particles accelerating in the first cycle of the laser-driven Gaussian pulse wake-up tail field. Based on this theory, we further discuss the maximum energy that can be obtained by the electron in the first cycle of wake field, the intensity and pulse of the laser pulse The results show that the maximum energy of the captured electrons is proportional to the intensity of the pulsed laser, and the proper selection of the pulsed laser wavelength also directly affects the maximum energy of the captured electrons.