Abstract

Several XFEL facilities are currently in the commissioning or operation phase and have opened new exciting scientific opportunities. In May 2017, the European XFEL successfully achieved a first lasing. Recently, most of the FEL facilities are going to invest (or have already invested) in advanced schemes to increase the longitudinal coherence properties of radiation compared to SASE. As one of the techniques, an external laser seeding is currently applicable at soft X-ray facilities, in a frequency range where external seed pulses are powerful enough to overcome the SASE shot noise. However, these techniques are now also being considered at several hard X-ray FEL facilities and aim for the production of nearly Fourier-limited pulses up to the keV range. At the European XFEL, the challenge of HGHG and EEHG options is the usage of very high electron beam energy. In this presentation, we will report the preliminary simulation results of the external laser seeding feasibility at the European XFEL.

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