Prospective THz Gyrotrons for High-Field Magneto-Resonance Spectroscopy V.L. Bratman, A.E. Fedotov, Yu.K. Kalynov and V.N. Manuilov EPJ Web Conf., 195 (2018) 01003 Published online: 23 November 2018 DOI: 10.1051/epjconf/201819501003