%\cite{Wang:FEL2015-MOC04} \bibitem{Wang:FEL2015-MOC04} G.L.~Wang, D.X.~Dai, G.R.~Wu, X.M.~Yang, and W.Q.~Zhang, \textquotedblleft{Operating of SXFEL in a Single Stage High Gain Harmonic Generation Scheme}\textquotedblright, % in \emph{Proc. FEL2015}, MOC04, pp. 29--33, % in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper MOC04, pp. 29--33, in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper MOC04, pp. 29--33, ISBN: 978-3-95450-134-2, \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/moc04.pdf}, doi:10.18429/JACoW-FEL2015-MOC04, 2015.