Design and Simulation of High-Power K-band Gyro-TWT

This paper presents the design and simulation of a High-Power K-Band Gyro-TWT operating in the fundamental TE 11 mode. The major sections of the tube are designed detailly. The Magnetron injection electron gun (MIG) achieves velocity ratio (a) of 1.3 and velocity spread $\left(\Delta \beta_z\right)$ of 1.9 %. The interaction circuit consist of three stages: prebunched stage, linear stage and curved nonlinear stage. 3DPIC code are employed to analysis the performance of the circuit. The tube could generate a saturated power of 350 kW at 20.6 GHz, corresponding to a saturated gain of 58.45 dB and a maximum efficiency of 31.5 %.