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Sökning: WFRF:(Kulyk Olena) > (2020)

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1.
  • Oelze, Tim, et al. (författare)
  • THz streak camera performance for single-shot characterization of XUV pulses with complex temporal structures
  • 2020
  • Ingår i: Optics Express. - : OPTICAL SOC AMER. - 1094-4087. ; 28:14, s. 20686-20703
  • Tidskriftsartikel (refereegranskat)abstract
    • The THz-field-driven streak camera has proven to be a powerful diagnostic-technique that enables the shot-to-shot characterization of the duration and the arrival time jitter of free electron laser (FEL) pulses. Here we investigate the performance of three computational approaches capable to determine the duration of FEL pulses with complex temporal structures from single-shot measurements of up to three simultaneously recorded spectra. We use numerically simulated FEL pulses in order to validate the accuracy of the pulse length retrieval in average as well as in a single-shot mode. We discuss requirements for the THz field strength in order to achieve reliable results and compare our numerical study with the analysis of experimental data that were obtained at the FEL in Hamburg - FLASH. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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2.
  • Sobolev, Egor, et al. (författare)
  • Megahertz single-particle imaging at the European XFEL
  • 2020
  • Ingår i: Communications Physics. - : Springer Science and Business Media LLC. - 2399-3650. ; 3:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The emergence of high repetition-rate X-ray free-electron lasers (XFELs) powered by superconducting accelerator technology enables the measurement of significantly more experimental data per day than was previously possible. The European XFEL is expected to provide 27,000 pulses per second, over two orders of magnitude more than any other XFEL. The increased pulse rate is a key enabling factor for single-particle X-ray diffractive imaging, which relies on averaging the weak diffraction signal from single biological particles. Taking full advantage of this new capability requires that all experimental steps, from sample preparation and delivery to the acquisition of diffraction patterns, are compatible with the increased pulse repetition rate. Here, we show that single-particle imaging can be performed using X-ray pulses at megahertz repetition rates. The results obtained pave the way towards exploiting high repetition-rate X-ray free-electron lasers for single-particle imaging at their full repetition rate.
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