Speaker
Description
Cavity desynchronization is important in FEL oscillators, especially in the IR and THz regimes where optical slippage is significant and laser lethargy can reduce gain under perfect synchronism. Because fast mechanical cavity tuning is difficult, several facilities have implemented dynamic desynchronization by sweeping the electron bunch repetition rate through upstream RF phase control, typically using linear phase ramps across a macropulse. Here, the University of Hawaiʻi FEL oscillator is used as an example system, and full 3D time-dependent simulations are employed to study the effect of dynamic desynchronization. Rather than assuming a linear ramp, we treat desynchronization as a pass-dependent control variable, recognizing that FEL gain and extraction efficiency evolve during oscillator buildup. This study enables exploration of timing profiles better matched to the changing FEL dynamics within the radiation power growth within a macro pulse. The results provide a basis for future adaptive and AI-assisted optimization of dynamic desynchronization in FEL oscillators.
Funding Agency
Supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences and Office of Accelerator Research & Development and Production, under Contract No. DE-SC0025583.
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