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使用二维粒子模拟程序研究了电子弓形波注入机制中激光脉冲形状对电子俘获效果的影响.研究结果表明,激光脉冲时间上升沿陡峭的正扭曲脉冲激发的尾波场强度高,加速区域分布广,并且有利于电子获得更高的初速度,从而推动更多的电子进入尾波场加速相位.在其他条件相同的情况下,正扭曲脉冲的电子俘获数目远高于激光脉冲时间分别为高斯形和负扭曲分布的情形,使得电子束的品质得到改善.研究结果对于理解尾波场加速中电子注入过程以及获得大电荷量高能电子束具有积极意义.
The effect of laser pulse shape on the electron trapping effect was studied by using two-dimensional particle simulator. The experimental results show that the coda wave excited by the positive twist pulse with steep rising edge of laser pulse has high intensity and wide acceleration area , And is conducive to the electron to obtain a higher initial velocity, thereby promoting more electrons into the wake-wave field to accelerate the phase.Under the same conditions, the number of positive trapping pulse electron capture is much higher than the laser pulse time were Gaussian And negative twist distribution, the quality of the electron beam is improved.The research results are of positive significance for understanding the electron injection process in the wake wave field acceleration and obtaining the high-energy electron beam with large charge.