Title of article :
Simulation of Coulomb interaction effects in electron sources
Author/Authors :
Rouse، نويسنده , , John Z. Zhu، نويسنده , , Xieqing and Liu، نويسنده , , Haoning and Munro، نويسنده , , Eric، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Abstract :
Over many years, we have developed electron source simulation software that has been used widely in the electron optics community to aid the development of rotationally symmetric electron and ion guns. The simulation includes the modelling of cathode emission and the effects of volumetric space charge. In the present paper we describe the existing software and explain how we have extended this software to include the effects of discrete Coulomb interactions between the electrons as they travel from the cathode surface to the exit of the gun. In the paper, we will describe the numerical models we have employed, the techniques we have used to maximize the speed of the Coulomb force computation and present several illustrative examples of cases analyzed using the new software, including thermal field emitters, LaB6 guns and flat dispenser-type cathodes.
Keywords :
Space charge , Coulomb interaction , Computer-Aided Design , Software , Electron gun
Journal title :
Nuclear Instruments and Methods in Physics Research Section A
Journal title :
Nuclear Instruments and Methods in Physics Research Section A