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Picosecond pump–probe X-ray scattering at the Elettra SAXS beamline

Authors :: Denys Naumenko
Christian Morello
Benedetta Marmiroli
Andrea Radeticchio
Heinz Amenitsch
Max Burian
Giorgio Biasiol
Source :: Journal of Synchrotron Radiation, Journal of synchrotron radiation 27 (2020): 51–59. doi:10.1107/S1600577519015728, info:cnr-pdr/source/autori:Burian M.; Marmiroli B.; Radeticchio A.; Morello C.; Naumenko D.; Biasiol G.; Amenitsch H./titolo:Picosecond pump-probe X-ray scattering at the Elettra SAXS beamline/doi:10.1107%2FS1600577519015728/rivista:Journal of synchrotron radiation/anno:2020/pagina_da:51/pagina_a:59/intervallo_pagine:51–59/volume:27
Abstract: A new setup for picosecond pump–probe X-ray scattering at the Austrian SAXS beamline at Elettra-Sincrotrone Trieste is presented. Details of the specific implementation are discussed and results of a first transient-heating experiment are shown.<br />A new setup for picosecond pump–probe X-ray scattering at the Austrian SAXS beamline at Elettra-Sincrotrone Trieste is presented. A high-power/high-repetion-rate laser has been installed on-site, delivering UV/VIS/IR femtosecond-pulses in-sync with the storage ring. Data acquisition is achieved by gating a multi-panel detector, capable of discriminating the single X-ray pulse in the dark-gap of the Elettra hybrid filling mode. Specific aspects of laser- and detection-synchronization, on-line beam steering as well protocols for spatial and temporal overlap of laser and X-ray beam are also described. The capabilities of the setup are demonstrated by studying transient heat-transfer in an In/Al/GaAs superlattice structure and results are confirmed by theoretical calculations.