K. Kawase, M. Fujimoto, K. Furukawa, A. Irizawa, G. Isoyama, R. Kato, and K. Kubo, "Single Picosecond THz Pulse Extraction from the FEL Macropulse using a Laser Activating Semiconductor Reflective Switch", in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper TUP029, pp. 430-432, ISBN: 978-3-95450-134-2, doi:10.18429/JACoW-FEL2015-TUP029, http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/tup029.pdf, 2015.