Implementation of secondary emission in three dimensional PIC numerical simulation

The theory of secondary electrons produced by electrons impacting the metal surface was discussed. Formulas of some important physical parameters were summarized, including secondary electron emission coefficient, and inelastically backscattered electron energy distribution. Then the secondary emission module of three dimensional PIC numerical simulation program was written. The corresponding numerical model was established. The simulation results including secondary electron emission coefficient and inelastically backscattered electron energy distribution are consistent with the theoretical predictions, which verifies the correctness of the simulation process.