The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Tsai:FEL2017-MOP020} \bibitem{Tsai:FEL2017-MOP020} C.-Y. Tsai, J. Wu, C. Yang, M. Yoon, and G. Zhou, \textquotedblleft{Sideband Instability in a Tapered Free Electron Laser}\textquotedblright, in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-MOP020}, 2018. % in \emph{Proc. FEL2017}, \url{https://doi.org/10.18429/JACoW-FEL2017-MOP020}, pp. 76--79. % in \emph{Proc. FEL2017}, Santa Fe, NM, USA, Aug. 2017, paper MOP020, \url{https://doi.org/10.18429/JACoW-FEL2017-MOP020} % in \emph{Proc. 38th Int. Free Electron Laser Conf. (FEL'17)}, % Santa Fe, NM, USA, Aug. 2017, paper MOP020, pp. 76--79, % ISBN: 978-3-95450-179-3, % \url{http://jacow.org/fel2017/papers/mop020.pdf}, % \url{https://doi.org/10.18429/JACoW-FEL2017-MOP020}, 2018.