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title: RADIATION PROPERTIES OF TAPERED HARD X-RAY FREE ELECTRON LASERS
format: conference proceeding
conference: FEL 2014 36th
year: 2014
6 authors: C. Emma | C. Pellegrini | J. Wu | K. Fang | S. Chen | S. Serkez
abstract: We perform an analysis of the transverse coherence of the radiation from a TW level tapered hard X-ray Free Electron Laser (FEL). The radiation properties of the FEL are studied for a Gaussian, parabolic and uniform transverse electron beam density profile in a 200 m undulator at a resonant wavelength of 1.5 Å. Simulations performed using the 3-D FEL particle code GENESIS show that diffraction of the radiation occurs due to a reduction in optical guiding in the tapered section of the undulator. This results in an increasing transverse coherence for all three transverse electron beam profiles. We determine that for each case considered the radiation coherence area is much larger than the electron beam spot size, making coherent diffraction imaging experiments possible for TW X-ray FELs.
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