The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Du:IPAC2017-THPAB124} \bibitem{Du:IPAC2017-THPAB124} B. Du, G. Huang, L. Lin, W. Liu, and Z.R. Zhou, \textquotedblleft{DSP Frame and Algorithm of LLRF of IR-FEL}\textquotedblright, % in \emph{Proc. IPAC2017}, pp. 4017--4019, % in \emph{Proc. IPAC2017}, Copenhagen, Denmark, May 2017, paper THPAB124, pp. 4017--4019, in \emph{Proc. 8th Int. Particle Accelerator Conf. (IPAC'17)}, Copenhagen, Denmark, May 2017, paper THPAB124, pp. 4017--4019, % ISBN: 978-3-95450-182-3, \url{http://jacow.org/ipac2017/papers/thpab124.pdf}, \url{https://doi.org/10.18429/JACoW-IPAC2017-THPAB124}, 2017.