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Sökning: WFRF:(Geloni G.)

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1.
  • Pop, Mihai, et al. (författare)
  • Single-shot transverse coherence in seeded and unseeded free-electron lasers: A comparison
  • 2022
  • Ingår i: Physical Review Accelerators and Beams. - 2469-9888. ; 25:040701
  • Tidskriftsartikel (refereegranskat)abstract
    • The advent of x-ray free-electron lasers (FELs) drastically enhanced the capabilities of several analytical techniques, for which the degree of transverse (spatial) coherence of the source is essential. FELs can be operated in self-amplified spontaneous emission (SASE) or seeded configurations, which rely on a qualitatively different initialization of the amplification process leading to light emission. The degree of transverse coherence of SASE and seeded FELs has been characterized in the past, both experimentally and theoretically. However, a direct experimental comparison between the two regimes in similar operating conditions is missing, as well as an accurate study of the sensitivity of transverse coherence to key working parameters. In this paper, we carry out such a comparison, focusing in particular on the evolution of coherence during the light amplification process.
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2.
  • Tanikawa, T., et al. (författare)
  • Volt-per-Ångstrom terahertz fields from X-ray free-electron lasers
  • 2020
  • Ingår i: Journal of Synchrotron Radiation. - 0909-0495 .- 1600-5775. ; 27, s. 796-798
  • Tidskriftsartikel (refereegranskat)abstract
    • The electron linear accelerators driving modern X-ray free-electron lasers can emit intense, tunable, quasi-monochromatic terahertz (THz) transients with peak electric fields of V Ångstrom(-1) and peak magnetic fields in excess of 10 T when a purpose-built, compact, superconducting THz undulator is implemented. New research avenues such as X-ray movies of THz-driven mode-selective chemistry come into reach by making dual use of the ultra-short GeV electron bunches, possible by a rather minor extension of the infrastructure.
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