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Model for intensity calculation in electron guns
Doyen O., De Conto J.M., Garnier J.P., Lefort M., Richard N.
Journal of Applied Physics 101 (2007) 084914 - http://hal.in2p3.fr/in2p3-00144717
Physique/Physique/Physique Générale
Sciences de l'ingénieur/Autre
Model for intensity calculation in electron guns
O. Doyen1, J.M. De Conto1, J.P. Garnier2, M. Lefort2, N. Richard2
1 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
http://lpsc.in2p3.fr
CNRS : UMR5821 – IN2P3 – Université Joseph Fourier - Grenoble I – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
53 avenue des Martyrs - 38026 Grenoble Cedex
France
2 :  Thomson Genlis SA
Thomson
avenue du Général De Gaulle 21110 Genlis
France
The calculation of the current in an electron gun structure is one of the main investigations involved in the electron gun physics understanding. In particular, various simulation codes exist but often present some important discrepancies with experiments. Moreover, those differences cannot be reduced because of the lack of physical information in these codes. We present a simple physical three-dimensional model, valid for all kinds of gun geometries. This model presents a better precision than all the other simulation codes and models encountered and allows the real understanding of the electron gun physics. It is based only on the calculation of the Laplace electric field at the cathode, the use of the classical Child–Langmuir's current density, and a geometrical correction to this law. Finally, the intensity versus voltage characteristic curve can be precisely described with only a few physical parameters. Indeed, we have showed that only the shape of the electric field at the cathode without beam, and a distance of an equivalent infinite planar diode gap, govern mainly the electron gun current generation.

Articles dans des revues avec comité de lecture
2007
Journal of Applied Physics (J. Appl. Phys.)
Publisher American Institute of Physics (AIP)
ISSN 0021-8979 
101
084914
© 2007 American Institute of Physics

LPSC 0739
84.47.+w
electron guns – cathodes – diodes
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DOC
Doyen-DeConto.doc(614 KB)
PDF
Doyen-DeConto.pdf(706.9 KB)