【摘要】 在考虑电子束品质影响时，给出了计算FEL自发辐射谱和小信号增益函数的公式．由结果知，Madey定理仍然满足．对几种典型的电子束分布进行了具体计算和讨论．更多还原

【Abstract】 The evaluatin formulas of the FEL spontaneous edrission and small-signalgain spectra are given with the consideration of the electron beam quality, which shows the Madey theorem is still applicable. For a few of the typical electron beam distributions, the spectra are calculated and discussed.更多还原