Design and Simulation of Coaxial Magnetron Injection Gun for a 170-GHz MW-Class Gyrotron

This article presents a design of the triode coaxial magnetron injection gun (CMIG) for a 170-GHz MW-class gyrotron. The trade-off equations have been used to initialize the design of gun geometry and beam parameters. The operating mode of gyrotron is TE 34,11 at fundamental harmonic. The 3-D electron tracing code CST Particle Studio has been employed to simulate and optimize the CMIG design. An optimum electron beam with transverse to longitudinal velocity ratio \alpha = 1.3 and transverse velocity spread \delta \beta _{\bot }= 3.29\% has been obtained. The sensitivity analysis of electron gun parameters are also investigated including geometric deviations and misalignments.