Abstract
A model of two-stream Free-Electron Lasers (FEL) with an axial guiding magnetic field (AGMF) is proposed and investigated in this paper. The dispersion relation is derived employing linear fluid theory. The characteristics of dispersion relation are analyzed in detail by numerical solutions, which show that the growth rate can be considerably enhanced and the operation frequency is significantly broader with the suitable of AGMF, separation velocity and beams’ relative density factor, and the occurrences of two-stream instability in FEL are stronger due to the presence of AGMF.
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