Instability in a Multimode Free Electron Laser: Effects of Electron Energy Drift

摘要

We discuss a phenomenological one dimensional, self-consistent, multimode (longitudinal) theory for a Free Electron Laser oscillator. A strong fundamental mode and weak side-band mode is followed through many passes in the optical cavityas the energy of the electron beam decreases monotonously. The time evolution of the laser power exhibits oscillations produced by the sequential growth to saturation and subsequent decay of longitudinal modes evenly distributed in frequency. (ERA citation 12:037476)