Demonstration of a positron beam-driven hollow channel plasma wakefield accelerator

Spencer Gessner (), Erik Adli, James M. Allen, Weiming An, Christine I. Clarke, Chris E. Clayton, Sebastien Corde, J. P. Delahaye, Joel Frederico, Selina Z. Green, Carsten Hast, Mark J. Hogan, Chan Joshi, Carl A. Lindstrøm, Nate Lipkowitz, Michael Litos, Wei Lu, Kenneth A. Marsh, Warren B. Mori, Brendan O’Shea, Navid Vafaei-Najafabadi, Dieter Walz, Vitaly Yakimenko and Gerald Yocky
Additional contact information
Spencer Gessner: SLAC National Accelerator Laboratory
Erik Adli: University of Oslo
James M. Allen: SLAC National Accelerator Laboratory
Weiming An: University of California–Los Angeles
Christine I. Clarke: SLAC National Accelerator Laboratory
Chris E. Clayton: University of California–Los Angeles
Sebastien Corde: LOA, ENSTA ParisTech, CNRS, Ecole Polytechnique, Université Paris-Saclay
J. P. Delahaye: SLAC National Accelerator Laboratory
Joel Frederico: SLAC National Accelerator Laboratory
Selina Z. Green: SLAC National Accelerator Laboratory
Carsten Hast: SLAC National Accelerator Laboratory
Mark J. Hogan: SLAC National Accelerator Laboratory
Chan Joshi: University of California–Los Angeles
Carl A. Lindstrøm: University of Oslo
Nate Lipkowitz: SLAC National Accelerator Laboratory
Michael Litos: SLAC National Accelerator Laboratory
Wei Lu: IFSA Collaborative Innovation Center, Tsinghua University
Kenneth A. Marsh: University of California–Los Angeles
Warren B. Mori: University of California–Los Angeles
Brendan O’Shea: SLAC National Accelerator Laboratory
Navid Vafaei-Najafabadi: University of California–Los Angeles
Dieter Walz: SLAC National Accelerator Laboratory
Vitaly Yakimenko: SLAC National Accelerator Laboratory
Gerald Yocky: SLAC National Accelerator Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract Plasma wakefield accelerators have been used to accelerate electron and positron particle beams with gradients that are orders of magnitude larger than those achieved in conventional accelerators. In addition to being accelerated by the plasma wakefield, the beam particles also experience strong transverse forces that may disrupt the beam quality. Hollow plasma channels have been proposed as a technique for generating accelerating fields without transverse forces. Here we demonstrate a method for creating an extended hollow plasma channel and measure the wakefields created by an ultrarelativistic positron beam as it propagates through the channel. The plasma channel is created by directing a high-intensity laser pulse with a spatially modulated profile into lithium vapour, which results in an annular region of ionization. A peak decelerating field of 230 MeV m−1 is inferred from changes in the beam energy spectrum, in good agreement with theory and particle-in-cell simulations.

Date: 2016
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DOI: 10.1038/ncomms11785

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