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                - A. Latina, D. Schulte, S. Stapnes, W. Wuensch
 
                       CERN, Geneva, Switzerland 
                - M. Aicheler
 
                       HIP, University of Helsinki, Finland 
                - A.A. Aksoy
 
                       Ankara University Institute of Accelerator Technologies, Golbasi, Turkey 
                - A. Bernhard
 
                       KIT, Karlsruhe, Germany 
                - J.A. Clarke
 
                       STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom 
                - A.W. Cross
 
                       USTRAT/SUPA, Glasgow, United Kingdom 
                - G. D'Auria, R. Geometrante
 
                       Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy 
                - R.T. Dowd
 
                       AS - ANSTO, Clayton, Australia 
                - D. Esperante Pereira
 
                       IFIC, Valencia, Spain 
                - W. Fang
 
                       SINAP, Shanghai, People's Republic of China 
                - A. Faus-Golfe
 
                       LAL, Orsay, France 
                - M. Ferrario
 
                       INFN/LNF, Frascati (Roma), Italy 
                - E.N. Gazis
 
                       National Technical University of Athens, Athens, Greece 
                - R. Geometrante
 
                       KYMA, Trieste, Italy 
                - M. Jacewicz
 
                       Uppsala University, Uppsala, Sweden 
                - A. Mostacci
 
                       Sapienza University of Rome, Rome, Italy 
                - F. Nguyen
 
                       ENEA C.R. Frascati, Frascati (Roma), Italy 
                - F. Pérez
 
                       ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain 
                - J.M.A. Priem
 
                       VDL ETG, Eindhoven, The Netherlands 
                - T. Schmidt
 
                       PSI, Villigen PSI, Switzerland 
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        H2020 CompactLight Project aims at designing the next generation of compact hard X-Rays Free-Electron Lasers, relying on very high accelerating gradients and on novel undulator concepts. CompactLight intends to design a compact Hard X-ray FEL facility based on very high-gradient acceleration in the X band of frequencies, on a very bright photo injector, and on short-period/superconductive undulators to enable smaller electron beam energy. If compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, be significantly more compact, as a consequence both of the lower energy and of the high-gradient X-band structures, have lower electrical power demand and a smaller footprint. CompactLight is a consortium of 24 institutes (21 European + 3 extra Europeans), gathering the world-leading experts both in the domains of X-band acceleration and undulator design.
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