xmpl2d15, 15th 'example' data file for CPO2D
Automatic iterative variation of the grid voltage of a simple thermionic electron gun.
A simple cathode is set up, with a grid and anode. The grid voltage is adjustable, to give the smallest focus on a screen in front of the anode. There are 'inner' and 'outer' iterative loops. The inner loop deals with space-charge iterations, while in the outer loop the grid voltage is varied.