The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
%\cite{Hosaka:IPAC2016-WEOAA03} \bibitem{Hosaka:IPAC2016-WEOAA03} M. Hosaka, M. Katoh, T. Konomi, K. Kuroda, N.S. Mirian, K. Miyamoto, \emph{et al.}, % M. Hosaka, M. Katoh, T. Konomi, K. Kuroda, N.S. Mirian, K. Miyamoto, S. Sasaki, and N. Yamamoto, % M. Hosaka \emph{et al.}, \textquotedblleft{Experimental Study on Optical Vortex from a Helical Undulator at UVSOR-III}\textquotedblright, % in \emph{Proc. IPAC2016}, pp. 2036--2038, % in \emph{Proc. IPAC2016}, Busan, Korea, May 2016, paper WEOAA03, pp. 2036--2038, in \emph{Proc. 7th Int. Particle Accelerator Conf. (IPAC'16)}, Busan, Korea, May 2016, paper WEOAA03, pp. 2036--2038, % ISBN: 978-3-95450-147-2, \url{http://jacow.org/ipac2016/papers/weoaa03.pdf}, \url{doi:10.18429/JACoW-IPAC2016-WEOAA03}, 2016.