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Experimental station Bernina at SwissFEL condensed matter physics on femtosecond time scales investigated by X-ray diffraction and spectroscopic methods

Abstract : The Bernina instrument at the SwissFEL Aramis hard X-ray free-electron laser is designed for studying ultrafast phenomena in condensed matter and material science. Ultrashort pulses from an optical laser system covering a large wavelength range can be used to generate specific non-equilibrium states, whose subsequent temporal evolution can be probed by selective X-ray scattering techniques in the range 2–12 keV. For that purpose, the X-ray beamline is equipped with optical elements which tailor the X-ray beam size and energy, as well as with pulse-to-pulse diagnostics that monitor the X-ray pulse intensity, position, as well as its spectral and temporal properties. The experiments can be performed using multiple interchangeable endstations differing in specialization, diffractometer and X-ray analyser configuration and load capacity for specialized sample environment. After testing the instrument in a series of pilot experiments in 2018, regular user operation begins in 2019.
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G. Ingold, R. Abela, C. Arrell, P. Beaud, P. Böhler, et al.. Experimental station Bernina at SwissFEL condensed matter physics on femtosecond time scales investigated by X-ray diffraction and spectroscopic methods. Journal of Synchrotron Radiation, International Union of Crystallography, 2019, 26 (3), pp.874-886. ⟨10.1107/S160057751900331X⟩. ⟨hal-02121503⟩

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