采用圆极化变参数摇摆器能延缓自由电子激光器件进入饱和,提高束波互作用效率。通过计算电子运动的柯尔莫哥洛夫熵来研究变参数摇摆器自由电子运动的稳定性。研究结果表明:摇摆器无论采用正坡度还是负坡度,平衡态电子的柯尔莫哥洛夫熵值均小于零,稳定性均比无坡度时好,但电子的运动轨迹趋于发散;当有激光场存在时,正坡度破坏电子运动的稳定性,负坡度改善电子运动的稳定性。其结果为电子运动稳定性的进一步研究提供参考。 The use of circular polarization variable parameter rocker can delay the free electron laser device into saturation and improve the efficiency of beam-wave interaction. By calculating the Kolmogorov entropy of electron motion, we study the stability of free electron motion in the variable-parameter rocker. The results show that both the Kolmogorov entropy of the equilibrium electrons are less than zero and the stability is better than that without slope, but the trajectories of the electrons tend to diverge. In the presence of a laser field, the positive slope destroys the stability of the electron motion and the negative slope improves the stability of the electron motion. The results provide a reference for the further study of the stability of electrons.