A 0.34-THz Standing Wave Enhanced Sheet Electron Beam Traveling-Wave Tube

A 0.34-THz standing wave enhanced sheet electron beam traveling-wave tube (SWE-SEB-TWT) is proposed in this article. The high-frequency structure is composed of two sections of staggered double-vane slow wave structures (SDV-SWSs) and two multigap resonant cavities that fall in between. A sheet-beam optical system, which shows a 100% flow rate over 50 mm in simulation, is designed to provide the required electron beam. By means of particle-in-cell (PIC) simulations, the output power of the 0.34-THz SWE-SEB-TWT reaches 25 W with the voltage of 19.5 kV and the current of 60 mA, corresponding to a gain exceeding 40 dB. The test results of the high-frequency structure fabricated by computer numerical control (CNC) milling show that the high-frequency characteristics are consistent with the expectation.