Measured Emittance Dependence on the Injection Method in Laser Plasma Accelerators

S. K. Barber, J. van Tilborg, C. B. Schroeder, R. Lehe, H.-E. Tsai, K. K. Swanson, S. Steinke, K. Nakamura, C. G. R. Geddes, C. Benedetti, E. Esarey, and W. P. Leemans
Phys. Rev. Lett. 119, 104801 – Published 5 September 2017

Abstract

Single-shot, charge-dependent emittance measurements of electron beams generated by a laser plasma accelerator (LPA) reveal that shock-induced density down-ramp injection produces beams with normalized emittances a factor of 2 smaller than beams produced via ionization injection. Such a comparison is made possible by the tunable LPA setup, which allows electron beams with nearly identical central energy and peak spectral charge density to be produced using the two distinct injection mechanisms. Parametric measurements of this type are essential for the development of LPA-based applications which ultimately require high charge density and low emittance.

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  • Received 16 March 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.104801

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Accelerators & BeamsPlasma Physics

Authors & Affiliations

S. K. Barber1,*, J. van Tilborg1, C. B. Schroeder1, R. Lehe1, H.-E. Tsai1, K. K. Swanson1,2, S. Steinke1, K. Nakamura1, C. G. R. Geddes1, C. Benedetti1, E. Esarey1, and W. P. Leemans1,2

  • 1Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA
  • 2Department of Physics, University of California, Berkeley, California 94720, USA

  • *sbarber@lbl.gov

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Vol. 119, Iss. 10 — 8 September 2017

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