%\cite{Stupakov:FEL2015-MOP056} \bibitem{Stupakov:FEL2015-MOP056} G.~StupakovP.~Emma, \textquotedblleft{Reversible Electron Beam Heater without Transverse Deflecting Cavities}\textquotedblright, % in \emph{Proc. FEL2015}, MOP056, pp. 166--170, % in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper MOP056, pp. 166--170, in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper MOP056, pp. 166--170, ISBN: 978-3-95450-134-2, \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/mop056.pdf}, doi:10.18429/JACoW-FEL2015-MOP056, 2015.