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TY - CONF AU - Gao, Z.F. AU - Yan, J.W. ED - Braun, Hans-Heinrich ED - Chrin, Jan ED - Ganter, Romain ED - Hiller, Nicole ED - Schaa, Volker RW TI - A Proposal for Generating Fully Coherent X-ray FEL with Femtosecond Pulse Based on Fresh-Slice J2 - Proc. of FLS2023, Luzern, Switzerland, 27 August-01 September 2023 CY - Luzern, Switzerland T2 - ICFA Advanced Beam Dynamics Workshop T3 - 67 LA - english AB - This study aims to propose a new principle for generating fully coherent femtosecond X-ray pulse on the Shanghai soft X-ray Free Electron Laser User Facility (SXFEL-UF), which was based on fresh-slice technique. The electron beam was kicked transversely to get a time-related transverse tilt. The sub-10-femtosecond bunch was achieved first because of the spatiotemporal synchronization effect of the seed laser modulation. Then the FEL pulse duration was even shorter because of harmonic lasing. In the cascaded HGHG mode, the laser generated by the beam tail modulated the beam head in the second stage to reach higher harmonics, while in the EEHG mode, the same part of the electron beam was modulated twice. The influence of emittance and energy chirp of the electron beam on the scheme was analyzed, and the instability caused by transverse position jitter and energy jitter of the chirped beam was evaluated. The relationship between the pulse duration and the transverse deflection of the beam is verified. The scheme is also explored to generate linearly polarized femtosecond pulse at 6 nm and circularly polarized femtosecond pulse at 3 nm simultaneously. PB - JACoW Publishing CP - Geneva, Switzerland SP - 261 EP - 263 KW - polarization KW - FEL KW - radiation KW - undulator KW - electron DA - 2024/01 PY - 2024 SN - 2673-7035 SN - 978-3-95450-224-0 DO - doi:10.18429/JACoW-FLS2023-TH4A4 UR - http://jacow.org/fls2023/papers/th4a4.pdf ER -