Tunable Plasma-Based Energy Dechirper
- D'Arcy, Richard
- Wesch, S.
- Meisel, M.
- Mehrling, T. J.
- Niknejadi, P.
- Poder, K.
- Röckemann, J.-H.
- Schaper, L.
- Palmer, C.
- Schwinkendorf, J.-P.
- Sheeran, B.
- Streeter, M. J. V.
- Aschikhin, Alexander
- Tauscher, G.
- Wacker, V.
- Osterhoff, J.
- Schmidt, Bernhard
- Behrens, Christopher
- Bohlen, S.
- Garland, M. J.
- Goldberg, L.
- Gonzalez Caminal, Pau
- Knetsch, A.
- Libov, V.
- Martinez de la Ossa, Alberto
DOIAbstract
A tunable plasma-based energy dechirper has been developed at FLASHForward to remove thecorrelated energy spread of a 681 MeV electron bunch. Through the interaction of the bunch withwakefields 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 densityare in good agreement with analytic predictions and three-dimensional simulations. The proof-of-principledechirping 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 energyphysics facilities, where large intrinsic chirps ne...
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