Abstract
X-ray pump/X-ray probe applications are made possible at X-ray Free Electron Laser (XFEL) facilities by generating two X-ray pulses with different wavelengths and controllable temporal delay. In order to enable this capability at the European XFEL, an upgrade project to equip the soft X-ray SASE3 beamline with a magnetic chicane is underway. In the present paper we describe the status of the project, its scientific focus and expected performance, including start-to-end simulations of the photon beam transport up to the sample, as well as recent experimental results demonstrating two-color lasing at photon energies of 805 eV + 835 eV and 910 eV + 950 eV. Additionally, we discuss methods to analyze the spectral properties and the intensity of the generated radiation to provide on-line diagnostics for future user experiments.
Highlights
Two-color pump–probe spectroscopy is a very powerful tool to study the temporal evolution of an excited system or, more generally, to investigate the dynamics of a photoinduced process [1,2].Typically, a first photon is used to initiate the process and a second interrogates the system under study in a time-resolved way
We reported on the status of the European X-ray Free Electron Laser (XFEL) two-color project at the soft X-ray SASE3 undulator
Pulse durations of about 1 fs can be achievable in the 20 pC low-charge operation mode, the “low-charge” scheme name
Summary
Two-color pump–probe spectroscopy is a very powerful tool to study the temporal evolution of an excited system or, more generally, to investigate the dynamics of a photoinduced process [1,2]. New developments at FEL sources have shown that it is possible to generate two FEL pulses at different photon energies, which enable pump–probe experiments [9,10,11] This method has two major advantages; first, the temporal jitter is drastically reduced, since both pulses are produced by the same electron bunch and, second, pump and probe pulses are both of high photon energies. This allows, for example, to selectively address different sites in a molecule or different subshells in an atom for inducing a process (pump) as well as for monitoring its evolution (probe).
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