Cold electron beams from cryocooled, alkali antimonide photocathodes

L. Cultrera; S. Karkare; H. Lee; X. Liu; I. Bazarov; B. Dunham

doi:10.1103/PhysRevSTAB.18.113401

Cold electron beams from cryocooled, alkali antimonide photocathodes

L. Cultrera, S. Karkare, H. Lee, X. Liu, I. Bazarov, B. Dunham

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

56 Scopus citations

Abstract

In this paper we report on the generation of cold electron beams using a Cs3Sb photocathode grown by codeposition of Sb and Cs. By cooling the photocathode to 90 K we demonstrate a significant reduction in the mean transverse energy validating the long-standing speculation that the lattice temperature contributes to limiting the mean transverse energy or intrinsic emittance near the photoemission threshold, opening new frontiers in generating ultrabright beams. At 90 K, we achieve a record low intrinsic emittance of 0.2 μm (rms) per mm of laser spot diameter from an ultrafast (subpicosecond) photocathode with quantum efficiency greater than 7×10-5 using a visible laser wavelength of 690 nm.

Original language	English (US)
Article number	113401
Journal	Physical Review Special Topics - Accelerators and Beams
Volume	18
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevSTAB.18.113401
State	Published - Nov 30 2015
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)
Surfaces and Interfaces

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10.1103/PhysRevSTAB.18.113401

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title = "Cold electron beams from cryocooled, alkali antimonide photocathodes",

abstract = "In this paper we report on the generation of cold electron beams using a Cs3Sb photocathode grown by codeposition of Sb and Cs. By cooling the photocathode to 90 K we demonstrate a significant reduction in the mean transverse energy validating the long-standing speculation that the lattice temperature contributes to limiting the mean transverse energy or intrinsic emittance near the photoemission threshold, opening new frontiers in generating ultrabright beams. At 90 K, we achieve a record low intrinsic emittance of 0.2 μm (rms) per mm of laser spot diameter from an ultrafast (subpicosecond) photocathode with quantum efficiency greater than 7×10-5 using a visible laser wavelength of 690 nm.",

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AU - Cultrera, L.

AU - Karkare, S.

AU - Lee, H.

AU - Liu, X.

AU - Bazarov, I.

AU - Dunham, B.

N1 - Publisher Copyright: © 2015 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "http://creativecommons.org/licenses/by/3.0/" Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2015/11/30

Y1 - 2015/11/30

N2 - In this paper we report on the generation of cold electron beams using a Cs3Sb photocathode grown by codeposition of Sb and Cs. By cooling the photocathode to 90 K we demonstrate a significant reduction in the mean transverse energy validating the long-standing speculation that the lattice temperature contributes to limiting the mean transverse energy or intrinsic emittance near the photoemission threshold, opening new frontiers in generating ultrabright beams. At 90 K, we achieve a record low intrinsic emittance of 0.2 μm (rms) per mm of laser spot diameter from an ultrafast (subpicosecond) photocathode with quantum efficiency greater than 7×10-5 using a visible laser wavelength of 690 nm.

AB - In this paper we report on the generation of cold electron beams using a Cs3Sb photocathode grown by codeposition of Sb and Cs. By cooling the photocathode to 90 K we demonstrate a significant reduction in the mean transverse energy validating the long-standing speculation that the lattice temperature contributes to limiting the mean transverse energy or intrinsic emittance near the photoemission threshold, opening new frontiers in generating ultrabright beams. At 90 K, we achieve a record low intrinsic emittance of 0.2 μm (rms) per mm of laser spot diameter from an ultrafast (subpicosecond) photocathode with quantum efficiency greater than 7×10-5 using a visible laser wavelength of 690 nm.

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Cold electron beams from cryocooled, alkali antimonide photocathodes

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