%0 Journal Article
%A Liu, Shan
%A Grech, Christian
%A Guetg, Marc
%A Karabekyan, Suren
%A Kocharyan, Vitali
%A Kujala, Naresh
%A Lechner, Christoph
%A Long, Tianyun
%A Mirian, Najmeh
%A Qin, Weilun
%A Serkez, Svitozar
%A Tomin, Sergey
%A Yan, Jiawei
%A Abeghyan, Suren
%A Anton, Jayson
%A Blank, Vladimir
%A Boesenberg, Ulrike
%A Brinker, Frank
%A Chen, Ye Lining
%A Decking, Winfried
%A Dong, Xiaohao
%A Kearney, Steve
%A La Civita, Daniele
%A Madsen, Anders
%A Maltezopoulos, Theophilos
%A Rodriguez-Fernandez, Angel
%A Saldin, Evgeny
%A Samoylova, Liubov
%A Scholz, Matthias
%A Sinn, Harald
%A Sleziona, Vivien
%A Shu, Deming
%A Tanikawa, Takanori
%A Terentiev, Sergey
%A Trebushinin, Andrei
%A Tschentscher, Thomas
%A Vannoni, Maurizio
%A Wohlenberg, Torsten
%A Yakopov, Mikhail
%A Geloni, Gianluca
%T Cascaded hard X-ray self-seeded free-electron laser at megahertz repetition rate
%J Nature photonics
%V 17
%N 11
%@ 1749-4885
%C London [u.a.]
%I Nature Publ. Group
%M PUBDB-2023-00111
%P 984 – 991
%D 2023
%Z Russische Institute beteiligt!
%X High-resolution X-ray spectroscopy in the sub-nanosecond to femtosecond time range requires ultrashort X-ray pulses and a spectral X-ray flux considerably larger than that presently available. X-ray free-electron laser (XFEL) radiation from hard X-ray self-seeding (HXRSS) setups has been demonstrated in the past and offers the necessary peak flux properties. So far, these systems could not provide high repetition rates enabling a high average flux. We report the results for a cascaded HXRSS system installed at the European XFEL, currently the only operating high-repetition-rate hard X-ray XFEL facility worldwide. A high repetition rate, combined with HXRSS, allows the generation of millijoule-level pulses in the photon energy range of 6–14 keV with a bandwidth of around 1 eV (corresponding to about 1 mJ/eV peak spectral density) at the rate of ten trains per second, each train including hundreds of pulses arriving at a megahertz repetition rate. At 2.25 MHz repetition rate and photon energies in the 6–7 keV range, we observed and characterized the heat-load effects on the HXRSS crystals, substantially altering the spectra of subsequent X-ray pulses. We demonstrated that our cascaded self-seeding scheme reduces this detrimental effect to below the detection level. This opens up exciting new possibilities in a wide range of scientific fields employing ultrafast X-ray spectroscopy, scattering and imaging techniques.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001096218600018
%R 10.1038/s41566-023-01305-x
%U https://bib-pubdb1.desy.de/record/491356