新型三电极几何形状加减速性能研究

Mohammed idrees kanaan albayati, Abdullah I. M. Alabdullah, Alaa Alahmad
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摘要

静电透镜是用带有圆柱孔的电极建立的,圆柱孔精确地排列在一条对称线上。本文设计了四种不同几何形状的加速和减速模式的三元圆柱静电透镜,从电子束穿过四种透镜前后的电势、像面内电子束直径、动能、速度和加速度等方面证明了电极几何形状对三元圆柱静电透镜工作特性的影响。根据镜片的光学性能,从四个镜片中选出最佳镜片。研究发现,外电极面凹的透镜作为加速透镜光学性能最好,内电极面凹的透镜作为减速透镜光学性能最好。研究发现,电极的几何形状对电子束在像面上的电子束直径的最小化和电子束的加速和减速起着重要的作用。使用SIMION8.0和SL Tools程序包进行计算。
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Investigation of the Acceleration and Deceleration Performance of the New Geometrical Shapes of the Three Electrode
Electrostatic lenses are established using billed electrodes with cylinder bores which are exactly organized on a line of symmetry. In this paper, four designs of three-element cylindrical electrostatic lenses in the acceleration and deceleration mode with different geometrical shapes were created to prove how the operational characteristics of the lenses are affected by the electrode geometry according to potentials, the electron beam diameter in the image plane, kinetic energy, velocity, and acceleration before and after the electron beam passes through each of the four lenses. The best lens is chosen from the four lenses based on its optical performance. It has been found that the lens with the concave outer electrode surface has the best optical performance as an accelerating lens, and the lens with the concave inner electrode surface has the best optical performance as a decelerating lens. It was discovered that the geometry of the electrodes plays a major role in minimizing the beam electron diameter at the image plane and in accelerating and decelerating the electron beam. The calculations are carried out by using the SIMION8.0 and SL Tools Programs package.
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