Upgrade of the BESSY femtoslicing source

As the first undulator-based source, the BESSY femtoslicing source has succesfully demonstrated its capabilities of providing 100 fs x-ray pulses in an energy range from 400 to 1400 eV with linear and circular polarisation. Even with a better signal-to-noise ration compared to the slicing sources utilizing radiation from a bending magnet the number of detected photons at the user frontend is still limited to ap 10
³
/s. To increase the photon flux the laser system was upgraded to a higher repetition rate. A new beamline utilizing a reflective zone-plate was installed. Finally a new vacuum guided laser beam path will be implemented for better stability.