Efficiency Enhancement, Sideband Suppression, and Optical Pulse Generation in Strongly Tapered Free-Electron Lasers

摘要

We have carried out fully self-consistent simulations of FEL dynamics in strongly tapered amplifiers. These are one-dimensional initial-value studies in which the electrons obey the single particle Hamiltonian equations that include the magnetic field of the wiggler as well as the space and time- dependent radiation field. The radiation field obeys Maxwell's equation (in the paraxial approximation), with the source current calculated self-consistently by summing over the electrons. The results of this simulation for the strong linear taper confirms the predictions of our earlier analytical theory on strong sideband suppression.