PIC Simulation of Multi-beam Terahertz Coaxial Resonator Reflex Klystron

In this paper, the particle-in-cell (PIC) simulation of a multi-beam terahertz (THz) coaxial resonator reflex klystron is conducted. When the currents of the beams are fixed as 5.7× 6 mA, the emission voltage of electron gun is set as 1.5 kV and the reflection voltage varies from 1.7kV to 2kV, the obtained output power varies from 0 to 700 mW and the signal frequency varies in the 130 MHz interval around 316.3 GHz, the maximum electron efficiency is about 1.36%. The output power of this reflex klystron is much higher than the traditional reflex klystron.