Abstract
This work describes a method for the generation of one and two-color ultra-short X-ray free-electron-laser pulses, based on tailoring the Coulomb interaction between the electrons of a highly compressed beam in the nonlinear regime.
Highlights
We report on the generation of one- and two-color attosecond hard x-ray pulses at SwissFEL by appropriately tailoring the nonlinear compression of the electron beam
Creating shorter x-ray pulses containing fewer modes is feasible by reducing the temporal duration of the electron beam suitable for X-ray free-electron lasers (XFELs) emission
Methods to produce two-color spontaneous emission (SASE) FEL pulses employ two undulator sections tuned at different wavelengths [33,34,35,36,37], or one undulator section with two lasing parts of the same electron bunch at different energies [38,39,40,41,42,43,44]. In this Rapid Communication, we present two major advances in the generation of ultrashort XFEL pulses
Summary
For achieving very short [about 300 attoseconds (as)] and stable single-color pulses, we minimize the collective effects of the longitudinal space-charge forces by strongly compressing the electron beam right before the undulator, utilizing the energy collimator chicane as a third compression stage. We demonstrate the generation of single-mode hard x-ray pulses based on nonlinear compression of the electron beam right before the undulator section, resulting in an enhanced pulse stability compared to previously reported results. We establish a method to produce attosecond two-color hard x-ray pulses, which exploits longitudinal space-charge forces acting between the compression and emission of radiation in the undulator.
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