Axially symmetric electron beam trajectory simulation

Abstract

An axially symmetric simulator for the Schottky emission gun has been developed using the boundary-fitted coordinate transformation method. The domain decomposition method is successfully employed with multi-layer overlapping, which allows complicated electrode structures to be modeled and the electric potential computation to converge quickly. The angular intensity distribution of Swanson's Schottky emission gun is analyzed, and good agreement is seen with his experimental data. The simulation results show that angular intensity and virtual source size are remarkably dependent on the real emitter size.

Simulation for the Development of Electron Guns and Detection Systems of Modern Field Emission Scanning Electron Microscopes

“…An axially symmetric simulator for a Schottky emission gun, shown in Figure 3, has been developed using the boundary-fitted coordinate transformation method (BFM) [3], which is a variation of FDM with curvilinear mesh. The emission of electrons from a metal is a function of the temperature, electric field and work function  w [4].…”