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Title: 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 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.
Authors:
; ; ; ;  [1] ;  [2]
  1. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. Brookhaven National Laboratory, Upton, New York 11973 (United States)
Publication Date:
OSTI Identifier:
22482187
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIMONY; ELECTRON DIFFRACTION; ELECTRON SOURCES; FREE ELECTRON LASERS; PHOTOCATHODES; PHOTOEMISSION; PHOTONS; THIN FILMS; TRANSVERSE MOMENTUM