the Optimization of the Third Electrode Design in Electrostatic Einzel Lenses
Keywords:
Electrostatic Lenses, Einzel lens, Ion beam focusing, charged particles optics, electron opticsAbstract
In this study, we designed an electrostatic Einzel lens, also known as a unipotential lens, with three electrodes. The two electrodes at each end were set to the ground potential, while a positive potential was Implemented on the central electrode. We explored the impact of changing the geometry of the third electrode on the trajectory of paraxial electron beams and the two-dimensional emittance. Notably, altering the outer diameter of the third electrode while keeping other parameters constant had a clear effect on the equipotential surface. This modification led to improvements in the electric potential and electric field distribution within the lens. Moreover, we introduced a cylindrical shape for the third electrode, acting as a cover for the first and second electrodes. Investigating its length revealed further enhancements in the path of the paraxial beam of electrons and reduced beam emittance. These findings highlight the importance of optimizing the third electrode's design to achieve superior performance in charged particle optics applications. The study demonstrates the potential of employing novel geometries and configurations to enhance the overall efficiency of electrostatic Einzel lenses.
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