Hi all, I am making electron gun. I have several High voltage power supply to provide enough voltages to Filament, Anode, Grid, Focus and deflection plates. I want to make electron gun of acclerationg potential of 5-8 KeV. I know I have to give negative supply to cathode or filament. and then put positive voltage to anode plate. But I don't know, the values of voltages that can be given to focus and deflection plate. Is there any method to calculate specific voltages ?