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In this paper, the effects of physical parameters on the gain and efficiency of Cherenkov type FEL are studied through simulative compute. The results show that the permittivity ε and periodic length λ_(?) of wiggler magnetic filed are two important parameters which influence the properties of laser. The magnitude ε has effect on the properties of gain, and the choice of wigger λ_(?) can increase gain and efficiency of the laser. The calculation results show that the gain and efficiency of Cherenkov type FEL are considerably higher than those of Compton-Raman type FEL under some conditions with proper parameters.
The results of that permit permit ε and periodic length λ_ (?) Of wiggler magnetic filed are two important parameters which influence the properties of laser. The magnitude ε has effect on the properties of gain, and the choice of wigger λ_ (?) can increase gain and efficiency of the laser. The calculation results show that the gain and efficiency of Cherenkov type FEL are relatively higher than those of Compton-Raman type FEL under some conditions with proper parameters.