Abdulfattah Mohammed, N., Ahmed Mohammed, I., Khder Yassin, S. (2008). Space- Charge effect in the Design of electron gun using immersion lens under high and low finite magnification condition. , 19(2), 156-163.
Nada Abdulfattah Mohammed; Intehaa Ahmed Mohammed; Samir Khder Yassin. "Space- Charge effect in the Design of electron gun using immersion lens under high and low finite magnification condition". , 19, 2, 2008, 156-163.
Abdulfattah Mohammed, N., Ahmed Mohammed, I., Khder Yassin, S. (2008). 'Space- Charge effect in the Design of electron gun using immersion lens under high and low finite magnification condition', , 19(2), pp. 156-163.
Abdulfattah Mohammed, N., Ahmed Mohammed, I., Khder Yassin, S. Space- Charge effect in the Design of electron gun using immersion lens under high and low finite magnification condition. , 2008; 19(2): 156-163.

Space- Charge effect in the Design of electron gun using immersion lens under high and low finite magnification condition

JOURNAL OF THE COLLEGE OF EDUCATION FOR WOMEN
Article 1, Volume 19, Issue 2, 2008, Pages 156-163
Authors
Nada Abdulfattah Mohammed; Intehaa Ahmed Mohammed; Samir Khder Yassin
Abstract
A computerized investigation has been carried out on the design of an electron gun taken into consideration space-charge effect under high and low finite magnification condition.The Finite element method (FEM) used in the solution of Poison's equation for determine the axial potential distribution of the immersion lens, paraxial ray equation was solved and the optical properties for this lens are calculated.The work has been focused on the effect of current beam on the spherical and chromatic aberration and to find the best value of the current which gives accepted value of aberration in the present of space-charge.
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