Speaker
Description
Cavity-based X-ray free-electron lasers (CBXFELs) are promising sources of fully coherent, stable, high-brightness hard X-rays, but practical implementation at LCLS-II-HE must account for beam-power and beam-dump limitations. In previous work, we proposed an active Q-switched X-ray regenerative amplifier FEL, where electron-beam phase-space manipulation controls the effective cavity quality factor. Here we ran start-to-end simluations using start-to-end LCLS-II-HE project parameters. Three-dimensional FEL simulations show that active Q-switching enables CBXFEL operation with a reduced electron-beam repetition rate, while allowing radiation to recirculate in a low-loss cavity between amplification shots. This lowers beam-power requirements while preserving efficient intracavity buildup and controlled outcoupling. The results support active Q-switching as a practical path toward coherent, narrow-band, high-average-brightness hard X-ray generation at future high-repetition-rate FEL facilities.
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