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

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  • Soichiro Tsujino

    (Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut)

  • Prat Das Kanungo

    (Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut)

  • Mahta Monshipouri

    (Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut)

  • Chiwon Lee

    (Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut
    Max Planck Institute for the Structure and Dynamics of Matter)

  • R.J. Dwayne Miller

    (Max Planck Institute for the Structure and Dynamics of Matter
    University of Toronto
    University of Toronto)

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.

Suggested Citation

  • Soichiro Tsujino & Prat Das Kanungo & Mahta Monshipouri & Chiwon Lee & R.J. Dwayne Miller, 2016. "Measurement of transverse emittance and coherence of double-gate field emitter array cathodes," Nature Communications, Nature, vol. 7(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13976
    DOI: 10.1038/ncomms13976
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