Speaker
Description
The generation of high-brightness electron beams with ultrashort duration and high temporal stability is essential for ultrafast electron diffraction (UED), which has become a powerful tool for ultrafast structural dynamics studies with high spatiotemporal resolution. However, simultaneously achieving sub-10 fs bunch duration and synchronization with pump laser remains challenging in practice. Here we report an upgrade of the FORTRESS (Facility Of Relativistic Time-Resolved Electron Sources and Scattering) beamline at Tsinghua University. By utilizing an α-magnet-based scheme and a 1.4-cell S-band photocathode gun, with optimized control of the time-of-flight (TOF)-momentum correlation and the time-momentum correlation in longitudinal phase space mainly governed by the initial chirp, a bunch duration of 3.47 fs with 4.34 fs TOF jitter characterized by THz streaking has been achieved, corresponding to a temporal precision of ~5 fs. The beamline layout, beam dynamics simulation, diagnostic methods and pump-probe UED experiments with high-performance results will be discussed.
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