The project of third harmonic medium power W-band gyrotronA.S. Zuev, A.P. Fokin, M.Y. Glyavin, R.M. Rozental, A.S. Sedov and E.S. SemenovEPJ Web Conf., 195 (2018) 01024DOI: https://doi.org/10.1051/epjconf/201819501024