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Cascaded hard X-ray self-seeded free-electron laser at megahertz repetition rate

Journal Article · · Nature Photonics
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  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  2. European XFEL, Schenefeld (Germany)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Peking Univ., Beijing (China)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States)
  5. Technological Institute for Superhard and Novel Carbon Materials, Troitsk (Russian Federation)
  6. European XFEL, Schenefeld (Germany); Shanghai Synchrotron Radiation Facility (SSRF) (China)
  7. European XFEL, Schenefeld (Germany); Fritz Haber Institute of the Max Planck Society, Berlin (Germany)
  8. European XFEL, Schenefeld (Germany); High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
+ Show Author Affiliations

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–1 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2294087
Journal Information:
Nature Photonics, Journal Name: Nature Photonics Journal Issue: 11 Vol. 17; ISSN 1749-4885
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)

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