Abstract

An 8mm traveling wave tube (TWT) based on carbon nanotube (CNT) cold cathode is theoretically researched to develop millimeter-wave vacuum electron radiation source devices based on CNT cold cathode in this paper. A gridded sheet-beam CNT electron gun and staggered double vane slow-wave structure (SWS) is adopted in the 8mm TWT based on a periodic permanent magnetic system. Simulation results show that the maximum output power of the CNT TWT can reach 128 W at 32 GHz with an input power of 80 mW, corresponding to the maximum gain of 32 dB, when the operation voltage and beam current are 20 kV and 100 mA, respectively. And the 3-dB bandwidth of the CNT TWT is about 6 GHz.

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