1981 年 50 巻 5 号 p. 1652-1659
Saturation mechanisms of free electron lasers are investigated in the Compton regime. It is found that saturation occurs due to quasi-linear energy spreading of the electron beam in the case of multi-mode excitation. Although the energy conversion efficiency remains low even if many modes are taken into account, it can be improved to more than 50% by reaccelerating the electrons with a traveling RF wave.
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