
%0 Journal Article
%A Hollway, DL 
%T The Optinium Space-Charge-Controlled Focus of an Electron Beam
%J Australian Journal of Chemistry
%D 1952/09/01
%V 5
%N 3
%P 430-436
%K 
%R https://doi.org/10.1071/CH9520430
%U https://www.publish.csiro.au/paper/CH9520430 
%X The problem of apace-charge defocusing of circular electron beams is considered. and expressions for the condition of optimum focus are derived from the equations of the beam profile.   It is shown that, over a wide range of spot radii, the optimum-focus expressions may be replaced by much simpler relationships suited to electron-beam design problems. 
