The study of electron source with flat diamond field emission cathode

There is a particular interest to possible usage of various field emission cathodes in electron sources. It seems very attractive to apply diamond flat cold cathodes as they show good emission parameters, are reliable, stable and rather insensitive to vacuum. Some measurements of divergence of e-beams emitted from diamond films and diamond-coated FEAs have been published. In this work we studied the divergence of the electron beam emitted from flat diamond cold cathode, passed through the split in the extracting metal anode. The aim was to analyse the influence of split edges on electron´s trajectories and to obtain information about initial angular and energy distribution of emitted electrons comparing experimental and calculated results. We used the split of rectangular form as it did not affect on electrons trajectories in direction along the split (axis y), by this means allowing to see initial electrons distribution, and its affects in the perpendicular direction (axis x).