%\cite{Giannessi:FEL2015-MOP013} \bibitem{Giannessi:FEL2015-MOP013} L.~Giannessi, E.~Allaria, L.~Badano, F.~Bencivenga, C.~Callegari, F.~Capotondi, \emph{et al.}, % L. Giannessi \emph{et al.}, \textquotedblleft{The Fermi Seeded FEL Facility: Operational Experience and Future Perspectives}\textquotedblright, % in \emph{Proc. FEL2015}, MOP013, pp. 57--60, % in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper MOP013, pp. 57--60, in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper MOP013, pp. 57--60, ISBN: 978-3-95450-134-2, \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop013.pdf}, doi:10.18429/JACoW-FEL2015-MOP013, 2015.