Thermal limit to the intrinsic emittance from metal photocathodes

Jun Feng; J. Nasiatka; Weishi Wan; Siddharth Karkare; John Smedley; Howard A. Padmore

doi:10.1063/1.4931976

Thermal limit to the intrinsic emittance from metal photocathodes

Jun Feng, J. Nasiatka, Weishi Wan, Siddharth Karkare, John Smedley, Howard A. Padmore

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

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.

Original language	English (US)
Article number	134101
Journal	Applied Physics Letters
Volume	107
Issue number	13
DOIs	https://doi.org/10.1063/1.4931976
State	Published - Sep 28 2015
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4931976

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title = "Thermal limit to the intrinsic emittance from metal photocathodes",

abstract = "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.",

author = "Jun Feng and J. Nasiatka and Weishi Wan and Siddharth Karkare and John Smedley and Padmore, {Howard A.}",

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AU - Feng, Jun

AU - Nasiatka, J.

AU - Wan, Weishi

AU - Karkare, Siddharth

AU - Smedley, John

AU - Padmore, Howard A.

PY - 2015/9/28

Y1 - 2015/9/28

N2 - 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.

AB - 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.

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Thermal limit to the intrinsic emittance from metal photocathodes

Abstract

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