A 0.33-THz second-harmonic frequency-tunable gyrotron
Li Zheng-Di1, 2, Du Chao-Hai3, Qi Xiang-Bo3, Luo Li1, 2, Liu Pu-Kun3, †,
       

Normalized power profiles of the first axial mode under different magnetic fields: (a) B0 = 6.022 T, (b) B0 = 6.03 T, and (c) B0 = 6.031 T.