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  Measurement of transverse emittance and coherence of double-gate field emitter array cathodes

Tsujino, S., Kanungo, P. D., Monshipouri, M., Lee, C., & Miller, R. J. D. (2016). Measurement of transverse emittance and coherence of double-gate field emitter array cathodes. Nature Communications, 7: 13976. doi:10.1038/ncomms13976.

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This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material.
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https://dx.doi.org/10.1038/ncomms13976 (Publisher version)
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Tsujino, S.1, Author
Kanungo, P. D.1, Author
Monshipouri, M.1, Author
Lee, C.1, 2, Author              
Miller, R. J. D.2, 3, 4, Author              
Affiliations:
1Laboratory for Micro- and Nanotechnology, Department of Synchrotron Radiation and Nanotechnology, Paul Scherrer Institut, ou_persistent22              
2Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
3Department of Chemistry, University of Toronto, ou_persistent22              
4Department of Physics, University of Toronto, ou_persistent22              

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 Abstract: Achieving small transverse beam emittance is important for high brightness cathodes for free electron lasers and electron diffraction and imaging experiments. Double-gate field emitter arrays with on-chip focussing electrode, operating with electrical switching or near infrared laser excitation, have been studied as cathodes that are competitive with photocathodes excited by ultraviolet lasers, but the experimental demonstration of the low emittance has been elusive. Here we demonstrate this for a field emitter array with an optimized double-gate structure by directly measuring the beam characteristics. Further we show the successful application of the double-gate field emitter array to observe the low-energy electron beam diffraction from suspended graphene in minimal setup. The observed low emittance and long coherence length are in good agreement with theory. These results demonstrate that our all-metal double-gate field emitters are highly promising for applications that demand extremely low-electron bunch-phase space volume and large transverse coherence.

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Language(s): eng - English
 Dates: 2016-06-172016-11-152016-12-23
 Publication Status: Published online
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1038/ncomms13976
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 7 Sequence Number: 13976 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723