%\cite{Ianconescu:FEL2015-MOP078} \bibitem{Ianconescu:FEL2015-MOP078} R.~Ianconescu, A.~Gover, E.~Hemsing, A.~Marinelli, and A.~Nause, \textquotedblleft{Sub-Radiance and Enhanced-Radiance of Undulator Radiation from a Correlated Electron Beam}\textquotedblright, % in \emph{Proc. FEL2015}, MOP078, pp. 221--226, % in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper MOP078, pp. 221--226, in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper MOP078, pp. 221--226, ISBN: 978-3-95450-134-2, \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop078.pdf}, doi:10.18429/JACoW-FEL2015-MOP078, 2015.