| Abstract | The planned soft X-ray beamline of the European X-FEL, called SASE 3, will deliver 100 fs light pulse in the energy range of 0.5 to 3.1 keV with up to 1014 photons/pulse. Part of the beamline will be dedicated to spectroscopic applications and more specifically to studies of small quantum systems. Considering the broad natural bandwidth of the FEL radiation (of 0.5 % hence about few eVs) spectroscopy will only be possible with a higher degree of spectral resolution. In order to reach a bandwidth of few tens of meV the beamline should include a monochromator. We will describe the nowadays beamline design based on a constant c value plane grating monochromator scheme. Results of ray tracing will show that the resolving power has been determined to be of 104 over the whole spectral range and µm focus can be achieve at the experiment.
Special attention will be dedicated to study of the behaviour of optical elements under irradiation. In fact, these components will be submitted to high peak brightness up to 100 gigawatts, hence damage of optical coating has to be explored. The properties and behaviour of different optical material are studied theoretically by calculating the absorbed dose. A short description of the on going experimental program using different ultra fast X-ray sources will be presented.
|
