Speaker
Description
Plasma-wakefield-based acceleration offers a route to realize compact X-ray free-electron lasers, but its application is currently limited by beam quality. Two-color X-ray FEL pulses provide a powerful tool for probing ultrafast dynamics. Here we propose a scheme for generating such pulses by using an off-axis elliptical hollow-channel plasma to tailor the electron-beam phase space while preserving its quality. In this approach, the plasma wakefield imprints a time-dependent transverse tilt along the bunch, while the elliptical channel geometry effectively suppresses the quadrupole wakefield and minimizes the induced mismatch. This enables fresh-slice lasing control at different wavelengths in two undulator sections. Simulations show the feasibility of generating femtosecond-scale, high-power two-color pulses with tunable temporal separation at the Shanghai Soft X-ray Free Electron Laser facility.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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