The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Huang:FEL2017-WEA02} \bibitem{Huang:FEL2017-WEA02} P.W. Huang, W.-H. Huang, and C.-X. Tang, \textquotedblleft{Model of Photocathode for CW Electron Gun}\textquotedblright, in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-WEA02}, 2018. % in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-WEA02}, pp. 394--396. % in \emph{Proc. FEL2017}, Santa Fe, NM, USA, Aug. 2017, paper WEA02, \url{https://doi.org/10.18429/JACoW-FEL2017-WEA02} % in \emph{Proc. 38th Int. Free Electron Laser Conf. (FEL'17)}, % Santa Fe, NM, USA, Aug. 2017, paper WEA02, pp. 394--396, % ISBN: 978-3-95450-179-3, % \url{http://jacow.org/fel2017/papers/wea02.pdf}, % \url{https://doi.org/10.18429/JACoW-FEL2017-WEA02}, 2018.