Study of a 0.34 THz Low-Voltage Miniaturized Non-Periodic Folded-Waveguide Slow Wave Structure Traveling Wave Tube

Folded-waveguide slow wave structure (FW-SWS) is an all-metal structure, which has been widely used in terahertz traveling wave tube amplifiers (TWTA) in recent years. In order to suppress oscillations, the attenuators and multi-sections are employed in the traditional FW-SWS TWTA for a stable output power. However, the electron efficiency of the terahertz TWTA is difficult to be improved. This talk will introduce a low-voltage miniaturized non-periodic concentric arc FW-SWS TWTA in single section without attenuators. The simulation results show that when the beam voltage is 7.5 kV, current is 20 mA and input power 10 mW, a stable output power of over 12 W can be obtained at 0.34 THz, where the gain is about 31 dB and electron efficiency is about 8%.