Details

Autor(en) / Beteiligte

• Grünert, Jan
• Carbonell, Marc Planas
• Dietrich, Florian
• Falk, Torben
• Freund, Wolfgang
• Koch, Andreas
• Kujala, Naresh
• Laksman, Joakim
• Liu, Jia
• Maltezopoulos, Theophilos
• Tiedtke, Kai
• Jastrow, Ulf Fini
• Sorokin, Andrey
• Syresin, Evgeny
• Grebentsov, Alexander
• Brovko, Oleg

Titel

X‐ray photon diagnostics at the European XFEL

Ist Teil von

• Journal of synchrotron radiation, 2019-09, Vol.26 (5), p.1422-1431

Ort / Verlag

5 Abbey Square, Chester, Cheshire CH1 2HU, England: International Union of Crystallography

Erscheinungsjahr

2019

Quelle

Wiley Online Library All Journals

Beschreibungen/Notizen

• The European X‐ray Free‐Electron Laser (European XFEL) (Altarelli et al., 2006; Tschentscher et al., 2017), the world's largest and brightest X‐ray free‐electron laser (Saldin et al., 1999; Pellegrini et al., 2016), went into operation in 2017. 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. Monitoring the photon pulses generated by the European XFEL is essential for its startup and operation. The X‐ray diagnostics system and commissioning results are described with an emphasis on the hard X‐ray SASE1 beamline, which was commissioned first.