Affiliation:
1. Institute of Advanced Scientific Facilities
Abstract
For an electron-optical imaging system with
wide beam focusing, the calculation of the field curvature can be
performed only theoretically and requires the specific analytical
expressions of the axial potential distribution in the streak tube and
its corresponding derivatives, making the calculation cumbersome. Even
when the electron trajectory is tracked using the numerical
calculation method, the calculated results cannot be verified
experimentally. A method for measuring the field curvature of the
streak tube based on the spherical fluorescent screen is proposed for
the first time, to the best of our knowledge. This method can directly
measure the field curvature from the experimental image without
requiring information on the internal structure of the streak tube,
which is extremely useful for the design of the subsequent image
reconstruction algorithm.
Funder
National Natural Science Foundation of China
Basic and Applied Basic Research Foundation of Guangdong Province
Shenzhen Science and Technology Innovation Program
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering