Work

Mean transverse energy of electrons generated from mixed thermionic, multiphoton, and field emissions

Year: 2025

Type: article

Abstract: The brightness of an electron emitter is fundamentally limited by the intrinsic emittance of the electrons born at a cathode. Different electron-emission mechanisms from a cathode give different values of mean transverse energy for calculating the intrinsic emittance of emitted electrons. This study reports a theory for calculating the mean transverse energy of electrons generated at a cathode via mixed thermionic, multiphoton, and field emissions. The theory successfully reveals the details of thermionically assisted multiphoton emission from a copper cathode excited by an intense infrared laser. An extension of the theory to calculate the intrinsic emittance and brightness of an electron emitter is also presented.

Source: Physical Review Accelerators and Beams

DOI: 10.1103/scmd-7zgh

Authors: Po-Hsun Wu, Yen-Chieh Huang

Institution: National Tsing Hua University

Language: English

Topic: Gyrotron and Vacuum Electronics Research

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funder: National Science and Technology Council

Award: Thz-Modulated Kev Photoemitter