Abstract:An analytical approach is presented to calculate the growth rate coefficient which describes the intensity evolution of a Cherenkov Free—Electron Laser (CFEL) operating in the linear high—gain regime. The effects of the energy spread on the growth rate of a CFEL are addressed by introducing a relaxation time in our analysis. The relaxation process is associated with a deviation of electron velocities from the average value due to an energy spread whatever its source. Therefore, the relaxation time can present … Show more
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