Cold electron beams from cryocooled, alkali antimonide photocathodes

In this paper we report on the generation of cold electron beams using a Cs_{3}Sb 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 temper...

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Main Authors: L. Cultrera, S. Karkare, H. Lee, X. Liu, I. Bazarov, B. Dunham
Format: Article
Language:English
Published: American Physical Society 2015-11-01
Series:Physical Review Special Topics. Accelerators and Beams
Online Access:http://doi.org/10.1103/PhysRevSTAB.18.113401
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spelling doaj-55c81715e981462391d3c08587395ff42020-11-25T02:15:34ZengAmerican Physical SocietyPhysical Review Special Topics. Accelerators and Beams1098-44022015-11-01181111340110.1103/PhysRevSTAB.18.113401Cold electron beams from cryocooled, alkali antimonide photocathodesL. CultreraS. KarkareH. LeeX. LiuI. BazarovB. DunhamIn this paper we report on the generation of cold electron beams using a Cs_{3}Sb 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.http://doi.org/10.1103/PhysRevSTAB.18.113401
collection DOAJ
language English
format Article
sources DOAJ
author L. Cultrera
S. Karkare
H. Lee
X. Liu
I. Bazarov
B. Dunham
spellingShingle L. Cultrera
S. Karkare
H. Lee
X. Liu
I. Bazarov
B. Dunham
Cold electron beams from cryocooled, alkali antimonide photocathodes
Physical Review Special Topics. Accelerators and Beams
author_facet L. Cultrera
S. Karkare
H. Lee
X. Liu
I. Bazarov
B. Dunham
author_sort L. Cultrera
title Cold electron beams from cryocooled, alkali antimonide photocathodes
title_short Cold electron beams from cryocooled, alkali antimonide photocathodes
title_full Cold electron beams from cryocooled, alkali antimonide photocathodes
title_fullStr Cold electron beams from cryocooled, alkali antimonide photocathodes
title_full_unstemmed Cold electron beams from cryocooled, alkali antimonide photocathodes
title_sort cold electron beams from cryocooled, alkali antimonide photocathodes
publisher American Physical Society
series Physical Review Special Topics. Accelerators and Beams
issn 1098-4402
publishDate 2015-11-01
description In this paper we report on the generation of cold electron beams using a Cs_{3}Sb 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.
url http://doi.org/10.1103/PhysRevSTAB.18.113401
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