Development of 3D Electromagnetic PIC Simulation Code for Magnetron

In order to examine electron dynamics and the electromagnetic interaction in the process of the microwave generation in magnetron, we newly started to develop a three dimensional (3D) magnetron simulator with electromagnetic particle-in-cell (PIC) model. In the test simulation, we could confirm the nonlinear evolution of electrons´ cross-field flow and associated microwave emission in magnetron. We particularly focused on the effect of the end-hat/end-space attached at each side of cathode/anode on the microwave emission as well as the electron dynamics in magnetron. We found that the frequency shift is due to the admittance of end-space which works as a resonator