The design of the aperture in the pole piece of a multi-beam confined-flow electron gun has been studied using the commercially available code OPERA 3D and validated the results using the CST particle studio, and the OmniTrak simulation tools. The results obtained by these tools are in good agreement with respect to the beam-waist radius and the throw of the electron gun. The square aperture proved to be a better option than circular aperture in providing the axisymmetric and uniform magnetic field. The shape and size of the pole piece have been optimized to enhance the laminarity of the electron beam using square aperture.
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