ﺼﻤﯿﻢ ﻗﺎذف اﻟﻜﺘﺮوﻧﻲ ﺑﺎﺳﺘﺨﺪام ﻋﺪﺳﺔ ﻣﻐﻤﻮرة ﺛﻨﺎﺋﯿﺔ اﻻﻗﻄﺎب ذات زﯾﻮغ ﻗﻠﯿﻠﺔ
Abstract A two electrode immersion electrostatic lens used in the design of an electron gun, with small aberration, has been designed using the finite element method (FEM). By choosing the appropriate geometrical shape of there electrodes the potential V(r,z) and the axial potential distribution h...
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| Format: | Article |
| Language: | Arabic |
| Published: |
College of Education for Women
2019-02-01
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| Series: | مجلة كلية التربية للبنات |
| Online Access: | http://jcoeduw.uobaghdad.edu.iq/index.php/journal/article/view/260 |
| Summary: | Abstract
A two electrode immersion electrostatic lens used in the design
of an electron gun, with small aberration, has been designed using
the finite element method (FEM). By choosing the appropriate
geometrical shape of there electrodes the potential V(r,z) and the
axial potential distribution have been computed using the FEM to
solve Laplace's equation.
The trajectory of the electron beam and the optical properties of
this lens combination of electrodes have been computed under
different magnification conditions (Zero and infinite magnification
conditions) from studying the properties of the designed electron
gun can be supplied with Abeam current of 5.7*10-6 A , electron
gun with half acceptance angle of (5mrad)
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| ISSN: | 1680-8738 2663-547X |