• Open Access

Optimizing density down-ramp injection for beam-driven plasma wakefield accelerators

A. Martinez de la Ossa, Z. Hu, M. J. V. Streeter, T. J. Mehrling, O. Kononenko, B. Sheeran, and J. Osterhoff
Phys. Rev. Accel. Beams 20, 091301 – Published 6 September 2017

Abstract

Density down-ramp (DDR) injection is a promising concept in beam-driven plasma wakefield accelerators for the generation of high-quality witness beams. We review and complement the theoretical principles of the method and employ particle-in-cell (PIC) simulations in order to determine constrains on the geometry of the density ramp and the current of the drive beam, regarding the applicability of DDR injection. Furthermore, PIC simulations are utilized to find optimized conditions for the production of high-quality beams. We find and explain the intriguing result that the injection of an increased charge by means of a steepened ramp favors the generation of beams with lower emittance. Exploiting this fact enables the production of beams with high charge (140pC), low normalized emittance (200nm) and low uncorrelated energy spread (0.3%) in sufficiently steep ramps even for drive beams with moderate peak current (2.5kA).

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  • Received 8 June 2017

DOI:https://doi.org/10.1103/PhysRevAccelBeams.20.091301

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)

Accelerators & Beams

Authors & Affiliations

A. Martinez de la Ossa1,*, Z. Hu2, M. J. V. Streeter2, T. J. Mehrling2, O. Kononenko2, B. Sheeran2, and J. Osterhoff2

  • 1Institut für Experimentalphysik, Universität Hamburg, 22761 Hamburg, Germany
  • 2Deutsches Elektronen-Synchrotron DESY, D-22607 Hamburg, Germany

  • *alberto.martinez.de.la.ossa@desy.de

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Vol. 20, Iss. 9 — September 2017

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