MC3: Novel Particle Sources and Acceleration Techniques
A22 Plasma Wakefield Acceleration
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Laser-Driven GeV Electron Acceleration and Exploration of Nonlinear Compton Scattering with PW Lasers  
  • C.H. Nam
    IBS, Daejeon, Republic of Korea
  The speaker will present progress and results for laser-driven GeV electron acceleration. The achieved energy and beam quality will be discussed. Present limitations and future directions will be pointed out. In addition the use of Peta-Watt scale laser for non-linear Compton scattering experiments shall be presented. The talk shall present an overview of major progress world-wide while explaining in more detail the progress and ambition in Korea.  
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Progress in Plasma-Based Accelerators Driven by Particle Beams  
  • S. Corde
    LOA, Palaiseau, France
  Funding: Supported by the European Research Council under the European Union’s Horizon 2020 research and innovation programme (Miniature beam-driven Plasma Accelerators project, Grant Agreement No. 715807).
Plasma wakefield acceleration is a promising concept for a compact particle accelerator with broad range of future applications, such as high energy physics or secondary light sources. Plasma can sustain accelerating fields > 100 GeV/m, driven by intense laser pulses (LWFA) or particle beams (PWFA). The latter one allows to overcome limitations on the accelerating length caused by the speed difference between laser and accelerated beam in LWFA, but requires a dense beam of relativistic particles to drive the wakefield, which are produced by expensive large scale conventional accelerators. Here we report on experimental progress made in PWFA using particle beam drivers from conventional RF accelerators as well as from LWFA. First, we will present results on the successful acceleration of positron beams in a PWFA, and discuss intrinsic limitations, from experimental measurements, theory and simulations. Second, we will show the first demonstration of a PWFA powered by laser-accelerated electron beams, and will discuss new possibilities opened by these results, from the direct optical imaging of the accelerating structure to the generation of bright beams beyond the state of the art.
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Energy Spread Control in Plasma Wakefield Accelerators  
  • R.T.P. D’Arcy
    DESY, Hamburg, Germany
  In order to apply plasma wakefield accelerators for free electron lasers and/or colliders it is mandatory to reduce the beam energy spread from the many-percent-level down to 0.1% without affecting the beam emittance. Recently such reduction has been observed in particle-driven plasma-wakefield accelerators. The correlated energy spread is reduced by using the interaction of the electron bunch with its wakefields generated in the plasma. This contribution reviews the working principle of such a dechirper and the experimental observations in the different test facilities. A view on future directions and various ideas and concepts is presented.  
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Outcome of the Horizon 2020 Design Study EuPRAXIA for a European Plasma Accelerator Facility  
  • A. Specka
    LLR, Palaiseau, France
  • R.W. Aßmann, A.R. Maier, A. Martinez de la Ossa, J. Osterhoff, P.A. Walker, M.K. Weikum
    DESY, Hamburg, Germany
  • A. Chancé, P.A.P. Nghiem
    CEA-IRFU, Gif-sur-Yvette, France
  • A. Cianchi
    INFN-Roma II, Roma, Italy
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma, Italy
  • M.-E. Couprie
    SOLEIL, Gif-sur-Yvette, France
  • B. Cros
    CNRS LPGP Univ Paris Sud, Orsay, France
  • G. Dattoli
    ENEA C.R. Frascati, Frascati (Roma), Italy
  • N. Delerue
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • U. Dorda
    SCK•CEN, Mol, Belgium
  • M. Ferrario, A. Mostacci, C. Vaccarezza
    INFN/LNF, Frascati, Italy
  • L.A. Gizzi
    INO-CNR, Pisa, Italy
  • B. Hidding, C.P. Welsch, G.X. Xia
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • B. Hidding, D.A. Jaroszynski, Z.M. Sheng
    USTRAT/SUPA, Glasgow, United Kingdom
  • A.R. Maier
    University of Hamburg, Hamburg, Germany
  • V. Malka
    Weizmann Institute of Science, Physics, Rehovot, Israel
  • F. Mathieu
    LULI, Palaiseau, France
  • A. Mostacci
    Sapienza University of Rome, Rome, Italy
  • Z. Najmudin
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • R. Pattathil
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • L.O. Silva
    Instituto Superior Tecnico, Lisbon, Portugal
  • R. Walczak
    JAI, Oxford, United Kingdom
  • R. Walczak
    Oxford University, Physics Department, Oxford, Oxon, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • G.X. Xia
    The University of Manchester, Manchester, United Kingdom
  Funding: This work was supported by the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 653782.
Although plasma accelerators can sustain unmatched accelerating gradients - up to three orders of magnitude beyond what RF-based machines reach - their performance and use in applications is still limited by beam quality, in particular a large inherent energy spread. With the aim to demonstrate user readiness, the EuPRAXIA design study has, since 2015, developed various concepts and techniques to improve electron beam quality, increase machine stability, and study possible applications of plasma accelerators. Consisting of a consortium of 41 laboratories from Europe, Asia and the US, the EuPRAXIA project thus presents the first design of a dedicated multi-GeV electron accelerator research infrastructure based on plasma accelerator technology. This presentation explains some of the technical innovations proposed in the EuPRAXIA design and highlights the general facility concept as well as the possible role of the project within the accelerator landscape.
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