Optical EngineeringUnited energy theory for free-electron lasers with different magnetic field structures
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A united energy model of free-electron lasers with different magnetic structures is established to calculate the energy transfer rate ofthe free-electron lasers underthe conditions of weak and strong signals, respectively. This model is simple in calculation and clear in physical meaning. It should be used to deal with various problems such as harmonic radiation, parameter variations, and so on. The model is also suitable for three-dimensional problems.