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Characterization of laser wakefield acceleration efficiency with octave spanning near-IR spectrum measurements

M. J. V. Streeter1,2,3,4,*, Y. Ma5,1,2, B. Kettle3, S. J. D. Dann1,2, E. Gerstmayr3, F. Albert6, N. Bourgeois7, S. Cipiccia8, J. M. Cole3 et al.

I. Gallardo González9, A. E. Hussein5,10, D. A. Jaroszynski11,1, K. Falk12,13,14, K. Krushelnick5, N. Lemos6, N. C. Lopes3,15, C. Lumsdon16, O. Lundh9, S. P. D. Mangles3, Z. Najmudin3, P. P. Rajeev7, R. Sandberg5, M. Shahzad11,1, M. Smid12, R. Spesyvtsev11,1, D. R. Symes7, G. Vieux11,1, and A. G. R. Thomas5,1,2,†

  • 1The Cockcroft Institute, Keckwick Lane, Daresbury, WA4 4AD, United Kingdom
  • 2Physics Department, Lancaster University, Lancaster LA1 4YB, United Kingdom
  • 3The John Adams Institute for Accelerator Science, Imperial College London, London, SW7 2AZ, United Kingdom
  • 4School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom
  • 5Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109-2099, USA
  • 6Lawrence Livermore National Laboratory (LLNL), P.O. Box 808, Livermore, California 94550, USA
  • 7Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
  • 8Diamond Light Source, Harwell Science and Innovation Campus, Fermi Avenue, Didcot OX11 0DE, United Kingdom
  • 9Department of Physics, Lund University, P.O. Box 118, S-22100, Lund, Sweden
  • 10Department of Electrical and Computer Engineering, University of Alberta, 9211 116 Street NW Edmonton, Alberta, T6G 1H9, Canada
  • 11SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom
  • 12Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328 Dresden, Germany
  • 13Technische Universitat Dresden, 01062, Dresden, Germany
  • 14Institute of Physics of the ASCR, 182 21 Prague, Czech Republic
  • 15GoLP/Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisboa 1049-001, Portugal
  • 16York Plasma Institute, Department of Physics, University of York, York YO10 5DD, United Kingdom
  • *m.streeter@qub.ac.uk
  • †agrt@umich.edu
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Phys. Rev. Accel. Beams 25, 101302 – Published 31 October, 2022

DOI: https://doi.org/10.1103/PhysRevAccelBeams.25.101302

Abstract

We report on experimental measurements of energy transfer efficiencies in a GeV-class laser wakefield accelerator. Both the transfer of energy from the laser to the plasma wakefield and from the plasma to the accelerated electron beam was diagnosed by simultaneous measurement of the deceleration of laser photons and the acceleration of electrons as a function of plasma length. The extraction efficiency, which we define as the ratio of the energy gained by the electron beam to the energy lost by the self-guided laser mode, was maximized at 19±3% by tuning the plasma density and length. The additional information provided by the octave-spanning laser spectrum measurement allows for independent optimization of the plasma efficiency terms, which is required for the key goal of improving the overall efficiency of laser wakefield accelerators.

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Phys. Rev. Accel. Beams 25, 101302– Published 31 October, 2022
  • Received 13 November 2020
  • Accepted 12 September 2022
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