Abstract: The evolution of the electron phase orbits in the plasma under the multi-photon nonlinear Compton scattering is discussed by using KMR model. There is an evolution from periodicity to non-periodicity of the only un-captured electron phase orbits after the energy exchange between an electron beam and photons is found. Along with the increase of the absorbed photon number by an electron, this evolution will be more and more faster, while it is rapidly decreased along with the enhancement of the collision non-flexibility between an electron and photons and the initial speeds of the electron before the scattering. But, the strenuous degree of the evolution is lower than that in the high power laser field. When the electrons are captured by the laser field, the evolution is finished, the electrons will stably transport, and the photons don't give the energy to these electrons.

Key words: Plasma, Multi-photon nonlinear Compton scattering, Electron phase orbits, Evolution

摘要： 用KMR模型研究了等离子体中多光子非线性Compton散射下电子相轨道的演化，发现电子与光子进行能量交换后，只有未被俘获电子的相轨道才能从周期性向非周期性、随机型演化，其演化剧烈程度随电子吸收光子数的增大而加剧，随电子与光子碰撞非弹性成分和碰撞前初始速度的增大而迅速减弱，但低于强激光场中的剧烈程度。当电子被光场俘获时，这种演化过程结束并做稳定的运动，光子不再为电子提供能量。

关键词: 等离子体, 多光子非线性Compton散射, 电子相轨道, 演化