Conveners
SASE FELs
- Evgeny Schneidmiller (Deutsches Elektronen-Synchrotron)
The natural time scale of valence electronic motion in molecular systems is on the order of hundreds of attoseconds. Consequently, the time-resolved study of electronic dynamics requires a source of sub-femtosecond pulses. Pulses in the soft x-ray domain can access core-level electrons, enabling the study of site-specific electron dynamics through attosecond pump/probe experiments. As...
European XFEL offers a unique combination of high electron
energy and soft X-ray SASE3 undulator resonant to low photon energies with
high K parameter. The long undulator allows us to employ split-undulator
scheme to deliver pump-probe radiation to users. Pulse energies depend on
photon energy and range from 100uJ at 2200eV to 900uJ at 600eV per pulse
respectively. We plan to install...
This contribution presents the experimental demonstration of improved performance of an X-ray free-electron-laser (FEL) using the optical klystron mechanism and helical undulator configuration in comparison to a standard planar undulator without optical klystron. The demonstration has been carried out at Athos, the soft X-ray beamline of SwissFEL. Athos has variable-polarization undulators and...
Phase shifters at undulator line are usually used for optimizing FEL intensity by setting 'in-phase' by matching the FEL pulse and electrons phases. π-offset so called ‘out-phase’ may suppress FEL intensity at the resonant frequency, therefore the 'out-phase' condition is an unwanted state. However, this 'out-phase' setting can arise side band spectrums. This phenomena can be explained by the...
