Thermal limit to the intrinsic emittance from metal photocathodes

Measurements of the intrinsic emittance and transverse momentum distributions obtained from a metal (antimony thin film) photocathode near and below the photoemission threshold are presented. Measurements show that the intrinsic emittance is limited by the lattice temperature of the cathode as the i...

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Bibliographic Details
Published in:Applied physics letters 2015-09, Vol.107 (13)
Main Authors: Feng, Jun, Nasiatka, J., Wan, Weishi, Karkare, Siddharth, Smedley, John, Padmore, Howard A.
Format: Article
Language:English
Subjects:
ANTIMONY
Applied physics
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRON DIFFRACTION
ELECTRON SOURCES
Emittance
FREE ELECTRON LASERS
PARTICLE ACCELERATORS
PHOTOCATHODES
Photoelectric emission
PHOTOEMISSION
PHOTONS
THIN FILMS
TRANSVERSE MOMENTUM
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Summary:Measurements of the intrinsic emittance and transverse momentum distributions obtained from a metal (antimony thin film) photocathode near and below the photoemission threshold are presented. Measurements show that the intrinsic emittance is limited by the lattice temperature of the cathode as the incident photon energy approaches the photoemission threshold. A theoretical model to calculate the transverse momentum distributions near this photoemission threshold is presented. An excellent match between the experimental measurements and the theoretical calculations is demonstrated. These measurements are relevant to low emittance electron sources for Free Electron Lasers and Ultrafast Electron Diffraction experiments.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4931976