Speaker
Description
Externally seeded free-electron lasers (FELs) provide a promising route toward fully coherent soft X-ray radiation. However, extending these schemes to shorter wavelengths and high repetition rates remains challenging due to the limited energy modulation achievable with currently available seed lasers. Recent breakthrough experiments at the Shanghai Soft X-ray FEL facility have demonstrated both self-amplification and direct amplification of coherent energy modulation—advances that significantly relax the peak power requirements of seed lasers. Using the bypass line of the SHINE facility, we optimize lattice configurations and investigate several advanced externally seeded FEL schemes. Numerical simulations show that these schemes can operate stably at high repetition rates while generating harmonics beyond the 30th order of the seed laser, offering a practical framework for performance optimization and experimental implementation at SHINE.
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