Experimental Advances in 220 GHz Sheet-Beam Traveling-Wave Tubes

A 220 GHz sheet-beam Traveling-Wave tube (TWT) with output power 50 W was proposed. For the project, a sheet-beam electron gun with a circular cathode and a periodic cusped magnet-tunable quadrupolar magnet (PCM-TQM) focusing system are designed using the three-dimensional particle simulation software Opera 18R2. The experimental results show that the total current of the sheet-beam electron gun is consistent with the simulated beam current of ~135 mA. In addition, the transmission properties of the T-shape staggered double-grating slow wave structure (SWS) with input and output couplers were measured. The measured data show that there is a good passband within 15 GHz frequency range for the proposed TWT. In the future, the device performance will be reported.