Study of a 0.34THz Confocal Gyrotron Traveling Wave Tube

Gyrotron traveling wave tube (gyro-TWT) with Confocal waveguide structure can generate high power due to operating in higher order modes. In this paper, the linear and nonlinear theory of a 0.34THz confocal waveguide gyro-TWT is studied. a numerical code based on the self-consistent nonlinear theory is written to simulate the beam wave interaction. The predicted output power of 35kW can be achieved at an electron beam of 60kV, an efficiency of 12% with a saturated gain of at least 60dB.