3-D-FDTD-PIC Simulation of Magnetic-Field Tuning in a THz Gyrotron

Gyrotron output under time-variant magnetic field tuning is studied by using a self-developed 3-D-FDTD-PIC simulation software. Our work demonstrated that, only one single-run simulation under time-variant magnetic field is enough to grasp the influence of different strength of magnetic field on the output, and each stage has carried enough frequency-domain and power information, whose error is no more than 1.43 dB. It can help greatly enhance the analysis efficiency and provide valuable guidance for parameter optimization during gyrotron experiment.