Design and simulation of a 390GHz seventh harmonic gyrotron using a large orbit electron beam

Fengping Li (1) , Wenlong He (1) , Adrian W Cross (1) , Craig R Donaldson (1) , Liang Zhang (1) , Alan D R Phelps (1) , Kevin Ronald (1)

1 Department of Physics

A ~390 GHz harmonic gyrotron based on a cusp electron gun has been designed and numerically modelled. The gyrotron operates at the 7 th harmonic of the electron cyclotron frequency with the beam interacting with a TE 71 waveguide mode. Theoretical as well as numerical simulation results using the 3D Particle-In-Cell (PIC) code MAGIC are presented. The cusp gun generated an axis-encircling, annular shaped electron beam of energy 40 keV, current 1.5 A with a velocity ratio ? of 3. Smooth cylindrical waveguides have been studied as the interaction cavities and their cavity Q optimized for 390 GHz operation. In the simulations ~ 600 W of output power at the design frequency has been demonstrated.

Mots clés: Physical Sciences

Fengping Li, Wenlong He, Adrian W Cross, Craig R Donaldson, Liang Zhang, et al.. Design and simulation of a 390GHz seventh harmonic gyrotron using a large orbit electron beam. Journal of Physics D: Applied Physics, 2010, 43 (15), pp.155204. ⟨10.1088/0022-3727/43/15/155204⟩. ⟨hal-00629946⟩