Simulation of the field emission arrays with parallel wedge emitter, gates and co-planar lens

摘要

Using the particle-in-cell (PIC) simulation code MAGIC, the wedge emitter, parallel gate and anode with and without co-planar lens have been simulated. The electron beam streamlines and the X-V_x phase space have been evaluated, which show that the co-planar lens focuses the electron. Simulation results are presented for a single FEA's cell with the anode biased at 500V and spaced 100μm from the cathode, which indicated that the electron beam width at anode is about 60.2μm for without lens FEAs, after add the lens with -70V, the electron beam width will be decrease to 8.1μm, meanwhile the maximum transverse velocity will decrease from ±3.1 * 10~6m/s to ±1.46 * 10~5m/s.