The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{davidyuk:fel2019-wep094} \bibitem{davidyuk:fel2019-wep094} I.V. Davidyuk, O.A. Shevchenko, V.G. Tcheskidov, and N.A. Vinokurov, \textquotedblleft{Variable-Period Variable-Pole Number Hybrid Undulator Design for Novosibirsk THz FEL}\textquotedblright, % --- abbreviated form (published paper) - JACoW template Feb 2018 --- in \emph{Proc. FEL'19}, Hamburg, Germany, Aug. 2019, pp. 531--534. \url{doi:10.18429/JACoW-FEL2019-WEP094} % --- additional material -ISSN/ISBN-- % ISBN: 978-3-95450-210-3, ISSN: ""