Simulation on a system generated electromagnetic pulse induced by photoelectrons emitted from plate

Based on the given temporal and energy spectrum of photoelectrons, the generation of an SGEMP (system generated electromagnetic pulse） induced by photoelectrons emitted from the bounded metal plate to free space is analyzed. The spatial motion characteristics and the distribution of photoelectrons, as well as the composition and the characteristics of the electromagnetic field are simulated by using a 2.5D PIC (particle-in-cell) code. It is shown that the simulated SGEMP field is composed of two parts: one is the quasi-DC background field and the other is a radiation field. The quasi-DC field is a radial field, attenuating quite rapidly with the distance from the emitted source. While the radiation field is also composed of two parts: one is the super-radiation field produced during electron emission from the metal plate and the other is the normal radiation field produced in the process of photoelectron motion in space. The characteristics of the two kinds of radiation field are investigated.