TY  - JOUR
AU  - Liu, Shan
AU  - Grech, Christian
AU  - Guetg, Marc
AU  - Karabekyan, Suren
AU  - Kocharyan, Vitali
AU  - Kujala, Naresh
AU  - Lechner, Christoph
AU  - Long, Tianyun
AU  - Mirian, Najmeh
AU  - Qin, Weilun
AU  - Serkez, Svitozar
AU  - Tomin, Sergey
AU  - Yan, Jiawei
AU  - Abeghyan, Suren
AU  - Anton, Jayson
AU  - Blank, Vladimir
AU  - Boesenberg, Ulrike
AU  - Brinker, Frank
AU  - Chen, Ye Lining
AU  - Decking, Winfried
AU  - Dong, Xiaohao
AU  - Kearney, Steve
AU  - La Civita, Daniele
AU  - Madsen, Anders
AU  - Maltezopoulos, Theophilos
AU  - Rodriguez-Fernandez, Angel
AU  - Saldin, Evgeny
AU  - Samoylova, Liubov
AU  - Scholz, Matthias
AU  - Sinn, Harald
AU  - Sleziona, Vivien
AU  - Shu, Deming
AU  - Tanikawa, Takanori
AU  - Terentiev, Sergey
AU  - Trebushinin, Andrei
AU  - Tschentscher, Thomas
AU  - Vannoni, Maurizio
AU  - Wohlenberg, Torsten
AU  - Yakopov, Mikhail
AU  - Geloni, Gianluca
TI  - Cascaded hard X-ray self-seeded free-electron laser at megahertz repetition rate
JO  - Nature photonics
VL  - 17
IS  - 11
SN  - 1749-4885
CY  - London [u.a.]
PB  - Nature Publ. Group
M1  - PUBDB-2023-00111
SP  - 984 – 991
PY  - 2023
N1  - Russische Institute beteiligt!
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001096218600018
DO  - DOI:10.1038/s41566-023-01305-x
UR  - https://bib-pubdb1.desy.de/record/491356
ER  -