High precision frequency stabilization of a 263 GHz continuous wave gyrotron G.G. Denisov, A.P. Fokin, M.Yu. Glyavin, G.Yu. Golubiatnikov, L.V. Lubyako, M.V. Morozkin, B.Z. Movschevich and A.I. Tsvetkov EPJ Web Conf., 149 (2017) 04022 Published online: 04 August 2017 DOI: 10.1051/epjconf/201714904022