Abstract
A new design of electron gun has been developed to study the effect of the curvature shape of the opposite electrodes faces on its optical and operational performance. Convex and concave arc shapes of different radii and orientations of the electrodes faces combined to design a series of electron guns geometries including the flat shape of the electrode face. Each model has been studied extensively to obtain the optimum electrode curvature shape. It has been found that it is possible to improve the current density and other optical properties of the electron gun by choosing suitable arc shape and radius for the confront electrodes.
Highlights
The development of the electron beam properties is of a great importance in various scientific instruments
The high brightness with low voltage electron emitter is required in the recently developed imaging mode called “wet-STEM”, and new developments in environmental scanning electron microscopy (ESEM) allow the observation of nano-objects suspended in a liquid phase, with a few nanometers resolution and a good signal to noise ratio
In this research work the new electrodes geometries have been introduced for the electron gun, so that, the electrodes faces curvature are systematically changed to investigate the optimum shape for the confront electrodes faces
Summary
The development of the electron beam properties is of a great importance in various scientific instruments. The axial potential distribution, the equipotential lines through the electrodes, the optical properties, the current densities, the brightness, the electron gun perveance and the electron probe diameter have been calculated for each electron gun geometry to choose the best design for the electrode face shape.
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