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First Lasing of a Free Electron Laser in the Soft X-Ray Spectral Range with Echo Enabled Harmonic Generation

Enrico Allaria,Alessandro Abrami,Laura Badano, Maurizio Bossi,Hans-Heinrich Braun,Niky Bruchon,Flavio Capotondi,Davide Castronovo,Marco Cautero,Paolo Cinquegrana,Marcello Coreno,Marie-Emmanuelle Couprie,Ivan Cudin,Miltcho Danailov,Giovanni de Ninno,Alexander Demidovich,Simone Di Mitri,Bruno Diviacco,William Fawley,Chao Feng,Mario Ferianis,Eugenio Ferrari,Laura Foglia,Fabio Frassetto,Giulio Gaio,David Garzella,Amin Ghaith, Fabio Giacuzzo,Luca Giannessi,Vanessa Grattoni,Sandi Grulja,Erik Hemsing, Fatma Iazzourene,Gabor Kurdi,Marco Lonza,Nicola Mahne,Marco Malvestuto,Michele Manfredda,Claudio Masciovecchio,Paolo Miotti,Najmeh Mirian,Ivaylo Nikolov,Giuseppe Penco,Gregory Penn,Luca Poletto,Mihai Pop,Eduard Prat,Emiliano Principi,Lorenzo Raimondi,Primoz Rebernik Ribič,Sven Reiche,Eléonore Roussel, Roberto Sauro,Claudio Scafuri,Paolo Sigalotti,Simone Spampinati,Carlo Spezzani,Luca Sturari,Michele Svandrlik,Takanori Tanikawa,Mauro Trovò,Marco Veronese,Davide Vivoda,Dao Xiang, Maurizio Zaccaria,Dino Zangrando,Marco Zangrando

international free electron laser conference（2019）

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Abstract
We report on the successful operation of a Free Electron Laser (FEL) in the Echo Enabled Harmonic Generation (EEHG) scheme at the FERMI facility at Sincrotrone Trieste. The experiment required a modification of the FEL-2 undulator line which, in normal operation, uses two stages of high-gain harmonic generation separated by a delay line. In addition to a new seed laser, the dispersion in the delay-line was increased, the second stage modulator changed and a new manipulator installed in the delay-line chicane hosting additional diagnostic components. With this modified setup we have demonstrated the first evidence of strong exponential gain in a free electron laser operated in EEHG mode at wavelengths as short as 5 nm.
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Key words
free electron laser,harmonic generation,first lasing,x-ray
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