Study on After Cavity Interaction in a 140-GHz Model TE0,3 Gyrotron Using 3-D CFDTD PIC Simulation

The possibility of dynamic after cavity interaction (ACI) in a down-scaled gyrotron model has been studied using a 3-D conformal finite-difference time-domain particle-in-cell simulation. The purpose has been to benchmark this type of simulation against previous numerical results obtained by other methods and tools and to obtain additional physical insight on the effect of dynamic ACI. The benchmarking has been successful, as a good agreement with the older results has been achieved. Thus, the algorithms developed and validated can be used for studying the issue in a larger scale or more realistic model with affordable computational resources in the near future.