Mechanical Optimization of the TR-XPES station of the SXP Instrument at the European XFEL

Abstract The TR-XPES (Time Resolved X-Ray Photoelectron Spectroscopy) setup is the first experimental station integrated at the Soft X-ray Port (SXP) instrument of the European XFEL. It has been developed to perform femtosecond time resolved photoelectron spectroscopy experiments on solid state samples in the soft X-ray photon energy range from 0.25 keV to 3 keV, generated by the SASE3 undulator system. A Pump-Probe Laser (PPL) colinearly propagating with the FEL into the experimental chamber is used to excite the samples. The laser pulses have the same time structure as the FEL beam for the two fundamental output wavelengths, 800 nm and 1030 nm, as well as for the second and third harmonics. Other wavelengths up to 15 microns can be generated with an Optical Parametric Amplifier (OPA) at reduced repetition rate. In this contribution, a mechanical optimization of the TR-XPES setup is presented.