X-ray photon diagnostics at the European XFEL

This article describes the as-built realization of photon diagnostics for this facility, the diagnostics commissioning and their application for commissioning of the facility, and results from the first year of operation, focusing on the SASE1 beamline, which was the first to be commissioned. The commissioning consisted of pre-beam checkout, first light from the bending magnets, X-rays from single undulator segments, SASE tuning with many undulator segments, first lasing, optics alignment for FEL beam transport through the tunnel up to the experiment hutches, and finally beam delivery to first users. The beam properties assessed by photon diagnostics throughout these phases included per-pulse intensity, beam position, shape, lateral dimensions and spectral properties. During this time period, the machine provided users with up to 14   keV photon energy, 1.5   mJ pulse energy, 300 FEL pulses per train and 4.5   MHz intra-bunch train repetition rate at a 10   Hz train repetition rate. Finally, an outlook is given into the diagnostic prospects for the future.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Tags: XFEL physics free-electron lasers photon diagnostics hard X-rays soft X-rays instrumentation research papers Source Type: research

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