In conditions that the laser gains can be obtained, the relations between the maximal allowable divergence Angle of incident electron beam and other physical parameters are discussed.
在获得激光增益的条件下，讨论了入射电子束的最大许可发散角与其它物理参数之间的关系。
The effect of divergence of the incident electron beam on the gain of FEL is analysed.
这种处理方法也适用于自由电子激光器的谐波辐射。
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