Design and study of the shape parameters for the electrode plates of the electron gun in the four-dimensional transmission electron microscope

Rev Sci Instrum. 2024 Aug 1;95(8):085117. doi: 10.1063/5.0215794.

Authors

Affiliations

¹ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, No. 8 South Third Street, Zhongguancun, Beijing 100190, China.
² School of Instrumentation and Optoelectronic Engineering, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, China.

PMID: 39212504
DOI: 10.1063/5.0215794

Abstract

The accelerating electrode of a four-dimensional transmission electron microscope electron gun is modeled. The general expression of the electric-field distribution is derived for any point on the axis in a cylindrical coordinate system, and equations for the shape parameters of the electrode plate are obtained. The accuracy of the field expression is determined for different electrode plate parameters, and the shape parameters of the electron gun electrode are further investigated. This work can provide a theoretical basis for the initial design of a transmission electron microscope electron gun and the retrofit design of a four-dimensional electron gun.