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Joint Research Group Ultrafast Dynamics

Experiment & methods

The XPP-KMC3-Beamline is a new facility that is currently in the final upgrade stage from the previous EDR-Beamline. The new beamline is an optimized instrument for Ultrafast X-Ray Diffraction (UXRD) experiments with a temporal resolution of 10 - 100 picoseconds. It will also be open for x-ray absorption experiments and probably for ultrafast time resolved variants of XANES. The beamline is equipped with two x-ray mirrors for collimation of the source beam and focusing into the experimental hutch, respectively. A new double crystal monochromator allows for tuning the x-ray energy from 2 keV up to 14 keV. Samples are excited with optical pulses emitted from a Ytterbium-doped fiber laser (Clarck Impulse, Inc.) at repetition frequencies between 200 kHz and 1.25 MHz. The Laser Lab can be used for complementary ultrafast optical experiments. Various methodes for freqeuncy conversion of the laser pulse are available, that can be used independently or in combination with the x-ray setup in the experimental hutch.

Optical methods

The laser hutch is equipped with an Ytterbium-doped fibre laser that emits femtosecond optical pulses at repetition rates between 200 kHz and 1.25 MHz. The laser is synchronized to the x-ray pulses from the storage ring. In addition to pump-probe experiments in combination with the synchrotron, we conduct various optical experiments in the laser lab. A detailed description of the optics hutch can be found in the section optical methods.

Beamline parameters and equipment

The beamline is optimized for UXRD experiments using hard x-rays at high repetition rates. A new experimental station for x-ray spectroscopy (EXAFS, XANES) methodes will be installed. A detailed description of the experimental stations and beamline parameters is given in the section Beamline characteristics.