为了研究在激光驱动的尾场中被加速电子的动能，采用粒子模拟方法,得到了决定电子最大动能的尾场势的最大值和最小值,讨论了等离子体尾波静电势的最大值和最小值及其与激光脉冲长度和强度之间的关系。结果表明，捕获电子最大能量与脉冲激光强度成正比，激光脉冲长度是激光波长的10倍时电子获得的能量最大。

In order to study kinetic energy of accelerated electrons in a laser-driven wakefield, maximum and minimum potential of the wakefield that could determine the maximum kinetic energy of the electrons was found by applying the particle in cell method. The peak and valley potential of the plasma wakefield and its relations to laser pulse length and intensity were discussed. It is shown that the maximum energy of a trapped electron is proportional to the intensity of the laser pulse and it reaches maximum value when the laser pulse length equals to nearly ten times of the wavelength.