Mirian, N.S. Salehi, E. First Simulation Results on Free Electron Laser Radiation in Displaced Phase-combined Undulators MOP068 undulator radiation electron resonance FEL 2015 2015-12 This report deals with self amplified spontaneous emission free electron laser (FEL) amplifier where the FEL emission is obtained from displaced phase combined undulators. Magnetic field of this adjustment methods in three dimensions is presented. The electron dynamics is investigated. The simulation method and results are explained. The radiation properties of the fundamental resonance and third harmonic through the phase combined undulators are compared with the normal undulator with the same undulator deflection parameter