变周期wiggler自由电子激光器

Free-electron laser with changeable periodic wiggler

分析了由于相对论电子在wiggler内传播过程中,相对论因子丁不断地减小,引起辐射频率移动,致使激光器的增益下降。提出采用空间周期随电子传播方向变化的wiegler,可维持辐射频率不变,从而提高激光增益。文中给出空间周期可采用的变化规律。

This paper analyses the gain change of free-electron laser caused by the radiation frequency shift as the relativistie factor y gradunally decreases while the relativistic electrons propagate in the wiggler. Using a wiggler whose spatial periodic changes' along the propagation direction to keep the radiation frequency constant, we can increase the laser gain. The possible change law of spatial periodic is given.