Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 25, Issue -, Pages 1517-1528Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577518006094
Keywords
split-and-delay unit; free-electron laser; pump-probe; multilayer mirror; temporal and spatial overlap
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Funding
- Bundesministerium fur Bildung und Forschung within the BMBF-Forschungsschwerpunkt Freie-Elektronen-Laser FSP-302 [05K10KT2, 05K13KT2, 05K16KT3]
- Leibniz-Gemeinschaft [SAW/2017/MBI4]
- Helmholtz Association [VH-NG-1104]
- Deutsche Forschungsgemeinschaft [SFB755/B03]
- US Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences [DE-AC02-06CH11357, DE-FG02-86ER13491]
- Horizon 2020 [Marie-Sklodowska-Curie 641789 MEDEA]
- International Synchrotron Access Program (ISAP), part of ANSTO
- Australian Government
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Extreme ultraviolet (XUV) and X-ray free-electron lasers enable new scientific opportunities. Their ultra-intense coherent femtosecond pulses give unprecedented access to the structure of undepositable nanoscale objects and to transient states of highly excited matter. In order to probe the ultrafast complex light-induced dynamics on the relevant time scales, the multi-purpose end-station CAMP at the free-electron laser FLASH has been complemented by the novel multilayer-mirror-based split-and-delay unit DESC (DElay Stage for CAMP) for time-resolved experiments. XUV double-pulses with delays adjustable from zero femtoseconds up to 650picoseconds are generated by reflecting under near-normal incidence, exceeding the time range accessible with existing XUV split-and-delay units. Procedures to establish temporal and spatial overlap of the two pulses in CAMP are presented, with emphasis on the optimization of the spatial overlap at long time-delays via time-dependent features, for example in ion spectra of atomic clusters.
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