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Tunable Plasma-Based Energy Dechirper

2019; American Physical Society; Volume: 122; Issue: 3 Linguagem: Inglês

10.1103/physrevlett.122.034801

1092-0145

Richard D’Arcy, S. Wesch, Alexander Aschikhin, Simon Bohlen, C. Behrens, M. J. Garland, Lars Goldberg, P. González, A. Knetsch, V. Libov, A. Martínez de la Ossa, Martin Meisel, Timon Mehrling, Pardis Niknejadi, Kristjan Põder, J.-H. Röckemann, L. Schaper, B. Schmidt, S. Schröder, C. A. J. Palmer, Jan‐Patrick Schwinkendorf, B. Sheeran, M. J. V. Streeter, Gabriele Tauscher, V. Wacker, Jens Osterhoff,

Magnetic confinement fusion research

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.