%\cite{Honda:FEL2015-TUP080} \bibitem{Honda:FEL2015-TUP080} Y.~Honda, A.~Aryshev, M.~Shevelev, and M.~Shimada, \textquotedblleft{Terahertz Source Utilizing Resonant Coherent Diffraction Radiation at KEK ERL Test Accelerator}\textquotedblright, % in \emph{Proc. FEL2015}, TUP080, pp. 547--549, % in \emph{Proc. FEL2015}, Daejeon, Republic of Korea, August 2015, paper TUP080, pp. 547--549, in \emph{Proc. 37th International Free Electron Laser Conference (FEL2015)}, Daejeon, Republic of Korea, August 2015, paper TUP080, pp. 547--549, ISBN: 978-3-95450-134-2, \url{http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup080.pdf}, doi:10.18429/JACoW-FEL2015-TUP080, 2015.