At the European X-ray Free Electron Laser facility one‐ or two‐ Si(111) channel (cut) crystal X‐ray monochromator (Kmonochromator) are planned for photon beam based alignment: gap tuning of the undulator segments and phase tuning of the phase shifters during commissioning and maintenance of the undulators. A prototype device has been built using a single channel-cut crystal and was characterized at PETRAIII synchrotron (at P01, which is the only beamline with two undulator segments) by applying different undulator adjustment methods, intended for the European XFEL, that use imaging and intensity detection. This paper presents the setup and the first results from the experimental qualification of the K-monochromator prototype.
This paper presents the outcome of ray tracing simulations for different optical schemes to be setup at the
European X-ray Free Electron Laser facility (XFEL.EU), Germany: one- or two- channel (cut) crystal X-ray
monochromators (K-Mono; using spontaneous radiation) are planned and designed mainly for photon beam
based alignment, which is gap tuning of the undulator segments and phase tuning of the phase shifters during
commissioning and maintenance of the undulators. The coherent SASE (Self Amplified Spontaneous Emission)
radiation will be monitored pulse-resolved by single-shot spectrometers of which two types are investigated: i) a
three element spectrometer, design proposed by Yabashi et al., which consists of a curved focusing mirror,
followed by a flat analyzer crystal and a 2D-detector.ii) a two element spectrometer based on a reflection zone
plate that reflects and focuses in one step, and a 2D-detector (currently under development).