A new triplet gyrotron amplifier, which we call gyrotriotron, has recently been developed. As shown in Fig. 1, the device consists of a gyro-TWT input stage to modulate the beam at S{sub}1 = 1 cyclotron harmonic, a four-unit clustered-cavity as intermediate stage to bunch the beam at S{sub}2 = 2 cyclotron harmonic and a gyro-TWT output stage to extract energy from the bunched beam at S{sub}3 = 2 cyclotron harmonic. Electronic coupling between neighboring stages is realized through ballistic beam bunching in the radiation-free drift space similar to what happens in a gyroklystron. Because S{sub}3 = S{sub}2 = 2S{sub}1, the device is a harmonic multiplying gyrotron amplifier with a scheme of 1-2-2. The clustered-cavity employed in the gyrotriotron is a group of TE{sub}(03) mode-selected cavities, which are closely adjacent and without any coupling between them. HFSS simulation of a sub-unit of such a mode selective clustered-cavity is shown in Fig.2. This is a first use of cluster cavity in a gyrotron.
展开▼
