The Space-Charge Effect on Theoretical Design of the Electron Gun Operated under Finite Magnification Condition
A computer theoretical s1udy has been carried out in field of opto - clcctroniccs, to design an electron gun using the space charge effect.
The distribution of axial potential upon the two -electrode
immersion lens of (L=l4mm) has been carried out using Poisons equation and the tinite clement method; knowing the first 11nd second derivation of the axial potential and the solution of paraxial ray equation, the optical properties of the focal length. (Spherical and Chromatic aberration Coefficients) been founds.
An acceptable values for Splerical and Chromatic aberration
Coefficients aberration coefficients abtained when a current of (I= I o-4
- A) applied with a been ofunifom1 cross-sectional area S=lmm 2.