Author: Arbelo, Y.P.
Paper Title Page
TUA03
 Generation of Sub-Femtosecond X-Ray Pulses at SwissFEL  
 
  • A. Malyzhenkov, Y.P. Arbelo, S. Bettoni, P. Craievich, P. Dijkstal, E. Ferrari, P.N. Juranič, E. Prat, S. Reiche
    PSI, Villigen PSI, Switzerland
  
  We report on the first generation of sub-femtosecond hard X-ray FEL pulses at SwissFEL. A few microjoule pulses with a single spike in the frequency domain have been predicted by simulations and then experimentally demonstrated. Ultra-short X-ray pulses are produced by the electron bunch with a specially-tailored current profile and longitudinal phase space. This configuration is achieved by means of an optimized nonlinear compression. Two- and three-stage nonlinear compression schemes are compared in terms of FEL performance and stability. We also discuss different FEL lasing regimes that can be realized depending on the particular configuration of the electron beam and undulator settings.  
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