Abstract

The high transverse coherence and peak brightness of ultra-short SASE-FEL pulses have already demonstrated the extraordinary potential for coherent diffraction imaging (CDI) in a single shot experiment before the radiation damage of the sample is manifested [1]. The limitations imposed by the partial longitudinal coherence of SASE-FEL for getting selective chemical information using single shot resonant (R-) CDI, should be overcome by the seeded FEL (S-FEL) sources, as FERMI@Elettra [2]. This opens unique opportunities for single-shot R-CDI experiments with access to elemental and/or magnetic structure of morphologically complex targets using the energy tunability and multiple (circular or linear) polarization of the fully coherent seeded FEL pulses. The measurement station for CDI, operating at the DiProI beamline of the FERMI@Elettra, is designed to meet the requirements for performing a wide range of static and dynamic studies and has been already commissioned using both synchrotron and FEL radiation [3]. This presentation will report the first CDI measurements illustrating the present performance of the measurement station in single-shot CDI and the advent of tunability and multiple polarization of the FERMI pulses in resonant magnetic scattering at Co M-absorption edges [4]. Finally, the unprecedented opportunity for jitter-free FEL pump-FEL probe time resolved CDI, opened by generation of two-color FEL pulses by the same electron bunch at FERMI-FEL, will be illustrated with the recent proof-of-of principle experiments using specially designed sample consisting of Ti grating. [1] H. N. Chapman et al, Nature Physics 2, 839 - 843 (2006). [2] E.Allarie et. al, Nature Photonics 6, 699-704 (2012) [3] E. Pedersoli et al, Rev. Sci. Instrum. 82, 043711 (2011). [4] F. Capotondi et al. in preparation.

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