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Tunable Plasma-Based Energy Dechirper.

  • Author(s): D'Arcy, R;
  • Wesch, S;
  • Aschikhin, A;
  • Bohlen, S;
  • Behrens, C;
  • Garland, MJ;
  • Goldberg, L;
  • Gonzalez, P;
  • Knetsch, A;
  • Libov, V;
  • de la Ossa, A Martinez;
  • Meisel, M;
  • Mehrling, TJ;
  • Niknejadi, P;
  • Poder, K;
  • Röckemann, J-H;
  • Schaper, L;
  • Schmidt, B;
  • Schröder, S;
  • Palmer, C;
  • Schwinkendorf, J-P;
  • Sheeran, B;
  • Streeter, MJV;
  • Tauscher, G;
  • Wacker, V;
  • Osterhoff, J
  • et al.
Abstract

A tunable plasma-based energy dechirper has been developed at FLASHForward to remove the correlated energy spread of a 681 MeV electron bunch. Through the interaction of the bunch with wakefields excited in plasma the projected energy spread was reduced from a FWHM of 1.31% to 0.33% without reducing the stability of the incoming beam. The experimental results for variable plasma density are in good agreement with analytic predictions and three-dimensional simulations. The proof-of-principle dechirping strength of 1.8  GeV/mm/m significantly exceeds those demonstrated for competing state-of-the-art techniques and may be key to future plasma wakefield-based free-electron lasers and high energy physics facilities, where large intrinsic chirps need to be removed.

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