Simulation Design of TWT Based on CNT Cold Cathode

Beam-wave interaction system of a Ka-Band traveling wave tube (TWT) based on carbon nanotube (CNT) cold cathode is theoretically researched in this paper. Based on the electron beam parameters of a truncated-cone carbon nanotube cold-cathode electron gun, a high-frequency system for coupled-cavity TWT is designed. Simulation results show that the maximum output power of the TWT can reach 313 W at 33.5 GHz with an input power of 500mW, corresponding to the maximum gain of 28 dB, when the electron beam voltage and current are 28 kV and 300 mA. The 3dB bandwidth of the TWT is about 0.6 GHz.