F. Peauger, A. Hamdi, S. Curt, S. Doebert, G. McMonagle, G. Rossat, K.M. Schirm, I. Syratchev, L. Timeo, S. Kuzikhov, A.A. Vikharev, A. Haase, D. Sprehn, A. Jensen, E.N. Jongewaard, C.D. Nantista and A. Vlieks: "A 12 GHz RF POWER SOURC E FOR THE CLIC STUDY", in proceedings of IPAC2010 http://accelconf.web.cern.ch/AccelConf/IPAC10/papers/THPEB053.pdf