Free electron x-ray lasers (FELs) have opened new horizons for researchers. It became possible to study the chemical and physical properties of substances, for example, exotic crystalline structures of nanomaterials, where high radiation power is important, and thanks to the coherent properties of FEL radiation, one can â€œseeâ€ electronic transitions in little-studied quantum systems with short-lived states, and much more. For one of the largest and most powerful X-ray FELs in the world, the European X-ray Free Electron Laser (XFEL), the possibility of an ultrafast change in the polarization of the FEL radiation was simulated.
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