The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Thomas:IPAC2017-MOPVA037} \bibitem{Thomas:IPAC2017-MOPVA037} C.A. Thomas, J. Fils, Y. Lussignol, P. Mattei, Ø. Midttun, L. Neri, \emph{et al.}, % C.A. Thomas, J. Fils, Y. Lussignol, P. Mattei, Ø. Midttun, L. Neri, F. Senée, T.J. Shea, and O. Tuske, % C.A. Thomas \emph{et al.}, \textquotedblleft{Development and Commissioning of the Doppler-Shift Unit for the Measurement of the Ion Species Fractions and Beam Energy of the ESS Proton Source}\textquotedblright, % in \emph{Proc. IPAC2017}, pp. 936--938, % in \emph{Proc. IPAC2017}, Copenhagen, Denmark, May 2017, paper MOPVA037, pp. 936--938, in \emph{Proc. 8th Int. Particle Accelerator Conf. (IPAC'17)}, Copenhagen, Denmark, May 2017, paper MOPVA037, pp. 936--938, % ISBN: 978-3-95450-182-3, \url{http://jacow.org/ipac2017/papers/mopva037.pdf}, \url{https://doi.org/10.18429/JACoW-IPAC2017-MOPVA037}, 2017.