Open AccessDesign of six electrode Enzial electrostatic lens low aberrations for electron gun
Author(s) -
Intehaa Ahmed Mohammed
Publication year - 2010
Publication title -
mağallaẗ baġdād li-l-ʿulūm
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.167
H-Index - 6
eISSN - 2411-7986
pISSN - 2078-8665
DOI - 10.21123/bsj.7.3.1127-1131
Subject(s) - electron gun , electrostatic lens , optics , magnification , chromatic aberration , lens (geology) , electron , cathode ray , electron optics , cathode , radius , physics , focal length , photocathode , aperture (computer memory) , magnetic lens , electrode , beam (structure) , chromatic scale , electrical engineering , engineering , acoustics , computer science , computer security , quantum mechanics
A computerized investigation has been carried out on the design of six electrodes electrostatic lenses used in electron gun application. The Finite-Element Method (FEM) was used in the solution of Laplace equation for determine the axial potential distribution. The electron trajectory under zero magnification condition.The optical properties, spherical and chromatic aberrations, the object and image focal length and object and image position are calculated.A very good futures for the electron gun with these lenses have been computed where are a beam current of 8.7*10-7A can be supplied using cathode tip of radius 10nm.