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TY - UNPB AU - Allaria, E. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - EEHG Experiment at FERMI J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - Echo enabled harmonic generation (EEHG) has been recognized as a possible solution to extend the tuning range of externally seeded FELs to wavelength as short as few nm. Previous experiments have confirmed the capabilities to produce bunching at very high harmonic but they have been done only at long wavelength. An experiment to demonstrate EEHG operations at high harmonic and short wavelength is planned at FERMI. With few modifications to the FERMI FEL-2 layout, EEHG will be studied and performances will be compared to other seeding schemes such as high gain harmonic generation (HGHG). Attention will be focused to the spectral purity and to the sensitivity of EEHG and HGHG to microbunching instabilities. PB - JACoW Publishing CP - Geneva, Switzerland ER -