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Title Design for HyRES Cathode Nanotip Electron Source
  • R.M. Hessami, A.F. Amhaz, P. Musumeci
    UCLA, Los Angeles, USA
Abstract A new ultrafast electron diffraction (UED) instrument is being developed by UCLA-Colorado University collaboration for the STROBE NSF Center with the goal of using electron and EUV photon beams to reveal the structural dynamics of materials in non-equilibrium states at fundamental atomic and temporal scales. This paper describes the design of the electron beamline of this instrument. In order to minimize the initial emittance, a nanotip photocathode, 25 nm in radius, will be used. This requires a redesign of the cathode and anode components of the electron gun to allow for the tip to be properly aligned. Solenoidal lenses are used to focus the beam transversely to a sub-micron spot at the sample and a radiofrequency (RF) cavity, driven by a continuous wave S-band RF source, longitudinally compresses the beam to below 100 fs, required for atomic resolution.
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Conference NAPAC2019
Series North American Particle Accelerator Conference (4th)
Location Lansing, MI, USA
Date 01-06 September 2019
Publisher JACoW Publishing, Geneva, Switzerland
Editorial Board Yoshishige Yamazaki (MSU, East-Lansing, MI, USA); Tor Raubenheimer (SLAC, Stanford, CA, USA); Amy McCausey (FRIB, East-Lansing, MI, USA); Volker RW Schaa (GSI, Darmstadt, Germany)
Online ISBN 978-3-95450-223-3
Online ISSN 2673-7000
Received 27 August 2019
Accepted 05 September 2019
Issue Date 08 October 2019
DOI doi:10.18429/JACoW-NAPAC2019-MOPLH04
Pages 177-180
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