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Energy-Spread Preservation and High Efficiency in a Plasma-Wakefield Accelerator. 2021
C A Lindstrøm, and
J M Garland, and
S Schröder, and
L Boulton, and
G Boyle, and
J Chappell, and
R D'Arcy, and
P Gonzalez, and
A Knetsch, and
V Libov, and
G Loisch, and
A Martinez de la Ossa, and
P Niknejadi, and
K Põder, and
L Schaper, and
B Schmidt, and
B Sheeran, and
S Wesch, and
J Wood, and
J Osterhoff
Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany.
Energy-efficient plasma-wakefield acceleration of particle bunches with low energy spread is a promising path to realizing compact free-electron lasers and particle colliders. High efficiency and low energy spread can be achieved simultaneously by strong beam loading of plasma wakefields when accelerating bunches with carefully tailored current profiles [M. Tzoufras et al., Phys. Rev. Lett. 101, 145002 (2008)PRLTAO0031-900710.1103/PhysRevLett.101.145002]. We experimentally demonstrate such optimal beam loading in a nonlinear electron-driven plasma accelerator. Bunches with an initial energy of 1 GeV were accelerated by 45 MeV with an energy-transfer efficiency of (42±4)% at a gradient of 1.3 GV/m while preserving per-mille energy spreads with full charge coupling, demonstrating wakefield flattening at the few-percent level.
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