Speaker
Description
Design studies of a high-power infrared-terahertz free-electron laser facility are presented. The facility is based on a high-repetition-rate superconducting linac and is designed to generate electron beams with energies up to about 60 MeV. A third-harmonic linearizing cavity and a C-type magnetic chicane are used to control the longitudinal phase space of the bunch. Start-to-end beam dynamics simulations show that the peak current can be increased from about 26 A to about 100 A, while keeping the normalized projected emittance below 1.2 mm mrad. Based on the optimized beam parameters, FEL oscillator simulations are performed for the mid-infrared, far-infrared and THz beamlines. The results show that cavity detuning has a significant influence on the mid-infrared output spectrum, and an appropriate detuning length helps suppress sidebands and multi-peak structures, leading to improved spectral monochromaticity. In the far-infrared range, the phase difference between transverse modes in the rectangular waveguide reduces the on-axis field intensity and leads to a clear reduction of the coupled output power around 85–95 μm. In the THz range, the output power decreases more smoothly with increasing wavelength, and no pronounced narrow spectral gap is observed. These studies provide a basis for beam-parameter selection, cavity-detuning optimization and waveguide-coupling design for high-power long-wavelength FEL operation.
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