Affiliation:
1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences 1 , No. 8 South Third Street, Zhongguancun, Beijing 100190, China
2. School of Instrumentation and Optoelectronic Engineering, Beihang University 2 , 37 Xueyuan Road, Haidian District, Beijing 100191, China
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.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Beijing Natural Science Foundation
Strategic Priority Research Program of the Chinese Academy of Sciences
Specific Research Assistant Funding Program of CAS
Scientific Instrument Developing Project of the Chinese Academy of Sciences
Synergetic Extreme Condition User Facility, the Guangdong Major Scientific Research Project
Beijing Municipal Science and Technology major project
IOP Hundred Talents Program