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Coherent Optical Signatures of Electron Microbunching in Laser-Driven Plasma Accelerators

A. H. Lumpkin, M. LaBerge, D. W. Rule, R. Zgadzaj, A. Hannasch, O. Zarini, B. Bowers, A. Irman, J. P. Couperus Cabadağ, A. Debus, A. Köhler, U. Schramm, and M. C. Downer
Phys. Rev. Lett. 125, 014801 – Published 2 July 2020
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Abstract

We report observations of coherent optical transition radiation interferometry (COTRI) patterns generated by microbunched 200MeV electrons as they emerge from a laser-driven plasma accelerator. The divergence of the microbunched portion of electrons, deduced by comparison to a COTRI model, is 9× smaller than the 3mrad ensemble beam divergence, while the radius of the microbunched beam, obtained from COTR images on the same shot, is <3μm. The combined results show that the microbunched distribution has estimated transverse normalized emittance 0.4mmmrad.

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  • Received 12 July 2019
  • Revised 27 May 2020
  • Accepted 9 June 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.014801

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Plasma PhysicsAccelerators & Beams

Authors & Affiliations

A. H. Lumpkin1, M. LaBerge2, D. W. Rule3, R. Zgadzaj2, A. Hannasch2, O. Zarini4,5, B. Bowers2, A. Irman4, J. P. Couperus Cabadağ4, A. Debus4, A. Köhler4,5, U. Schramm4,5, and M. C. Downer2,*

  • 1Accelerator Division, Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
  • 2Physics Department, University of Texas-Austin, Austin, Texas 78712, USA
  • 3Silver Spring, Maryland 20904, USA
  • 4Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 5Technische Universität Dresden, 01062 Dresden, Germany

  • *downer@physics.utexas.edu

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Vol. 125, Iss. 1 — 3 July 2020

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