J.R. Lewandowski, R.C. Field, A.S. Fisher, H.-D. Nuhn, and J.J. Welch,
   "RF Gun Dark Current Suppression with a Transverse Deflecting Cavity at LCLS",
   in Proc. 37th International Free Electron Laser Conference, Daejeon, Republic of Korea, August 2015, paper WEP001, pp. 583-586,
    ISBN: 978-3-95450-134-2,
    doi:10.18429/JACoW-FEL2015-WEP001,
    http://accelconf.web.cern.ch/AccelConf/FEL2015/papers/wep001.pdf, 2015.