Dynamic cavity desynchronization in a shout pulse free-electron laser resonator

It is well known that the cavity detuning length is one of the most importa nt parameters in free-electron laser (FEL) oscillators, especially for oper ating with short electron pulses. Using one-dimensional Maxwell-Lorentz cou pled equations, we demonstrate the control of short-pulse FEL oscillator ch aracteristics by changing dynamically the effective cavity detuning length. The optimal operation conditions of the dynamic cavity desynchronization ( DCD) scheme are thoroughly investigated by an extensive simulation work.