Abstract
In order to develop the terahertz vacuum electronic radiation source devices with field emission cold cathodes, a 300GHz carbon nanotube (CNT) cold cathode gyrotron is investigated in this paper. The electron gun is designed by particle-in-cell (PIC) simulation software. A magnetic injection CNT cold cathode electron gun with 35kV/200mA is developed. Electron gun simulation results show that the velocity ratio of electron beam is 1.3, the average beam radius in the cavity is 0.845 mm. The spread of perpendicular and parallel velocities are 3% and 4.5%, respectively. Results of beam-wave interaction simulation show that the TE03 mode at the frequency of 301 GHz is oscillated. An output power of 450 W is obtained.
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