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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American Physical Society
2015-11-01
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Series: | Physical Review Special Topics. Accelerators and Beams |
Online Access: | http://doi.org/10.1103/PhysRevSTAB.18.113401 |
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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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