Investigation of a 210 GHz spatial harmonic magnetron using 3-D particle-in-cell simulation

摘要

A 40-vane THz Spatial Harmonic Magnetron (SHM) at 210GHz with a cold secondary emission cathode is investigated by the use of a 3-D Particle-in-Cell (PIC) simulation. There are two important features of this simulation. The one is that the electromagnetic oscillation grows naturally from the noise which enables us to observe time-evolved space charge distribution. The other is that the fabrication tolerance is taken into account in the simulation model in order to get accurate simulation results. This simulation work reveals that the SHM in THz band has a low efficiency due to the surface-wave RF field and the space charge is turbulent and appears non-periodic due to the electron secondary emission.