The Quantum Efficiency and Thermal Emittance of Metal Photocathodes
By D. Dowell, J. Schmerge. 2009
237 citations recorded by the source corpus.
Modern electron beams have demonstrated the brilliance needed to drive free electron lasers at x-ray wavelengths with major advances occurring since the invention of the photocathode gun and the realization of emittance compensation. These state-of-the-art electron beams are now becoming limited by the intrinsic thermal emittance of the cathode. In both dc and rf photocathode guns details of the cathode emission physics strongly influence the quantum efficiency and the thermal emittance. Therefore improving cathode performance is essential to increasing the brightness of beams. It is especially important to understand the fundamentals of cathode quantum efficiency and thermal emittance. This paper investigates the relationship between the quantum efficiency and the thermal emittance for metal cathodes using the Fermi-Dirac model for the electron distribution. We use a consistent theory to derive the quantum efficiency and thermal emittance, and compare our results to those of others.
Subfields: Biomedical Engineering, Electrical and Electronic Engineering, Surfaces, Coatings and Films
View Paper: https://www.semanticscholar.org/paper/7384d9db478fb07aab1e309e2cb31bfe1aa0ca45
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In Electrical and Electronic Engineering
Citations in the corpus
- Cathode R&D for future light sources (2010, background): “The model is also starting to be used to explain thermal emittance from metals and cesiated metallic surfaces [4, 59].”
- Compact x-ray source based on burst-mode inverse Compton scattering at 100 kHz (2014, background): “14 eV is the effective work function [18] of Cu(100) at an applied field of 140 MV/m, and σx is the RMS beam size.”