It is shown that an electron passing through a walkingwave magnetic field can also produce spontaneous radiation,so,the walkingwave magnetic field can serve as a wiggler of free electron laser.%相对论性电子在周期性磁场中的运动将产生自发辐射,这是产生自由电子激光的基础.本文采用行波磁场作为周期性磁场,通过讨论可以看出,当电子通过这种磁场时将产生自发辐射,说明该磁场能作为自由电子激光器的摆动器.
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