Next-generation plasma-based accelerators can push elec-tron bunches to gigaelectronvolt energies within centimetre distances. The plasma, excited by a driver pulse, generates large electric fields that can efficiently accelerate a trailing witness bunch, enabling the realization of laboratory-scale applications ranging from high-energy colliders to ultrabright light sources. So far, several experiments have demonstrated large accelerations but the resulting beam quality, par-ticularly the energy spread, is still far from state-of-the-art conventional accelerators. Here we show the results of a beam-driven plasma acceleration experiment where we used an electron bunch as a driver followed by an ultrashort wit-ness bunch. By setting a positive energy chirp on the witness bunch, its longitudinal phase space is rotated during accel-eration, resulting in an ultralow energy spread that is even lower than the spread at the plasma entrance. This result will significantly impact the optimization of the plasma accelera-tion process and its implementation in forthcoming compact machines for user-oriented applications.

Energy spread minimization in a beam-driven plasma wakefield accelerator / Pompili, R.; Alesini, D.; Anania, M. P.; Behtouei, M.; Bellaveglia, M.; Biagioni, A.; Bisesto, F. G.; Cesarini, M.; Chiadroni, E.; Cianchi, A.; Costa, G.; Croia, M.; Del Dotto, A.; Di Giovenale, D.; Diomede, M.; Dipace, F.; Ferrario, M.; Giribono, A.; Lollo, V.; Magnisi, L.; Marongiu, M.; Mostacci, A.; Piersanti, L.; Di Pirro, G.; Romeo, S.; Rossi, A. R.; Scifo, J.; Shpakov, V.; Vaccarezza, C.; Villa, F.; Zigler, A.. - In: NATURE PHYSICS. - ISSN 1745-2473. - 17:4(2021), pp. 499-503. [10.1038/s41567-020-01116-9]

Energy spread minimization in a beam-driven plasma wakefield accelerator

Pompili, R.;Behtouei, M.;Bellaveglia, M.;Bisesto, F. G.;Chiadroni, E.;Cianchi, A.;Croia, M.;Di Giovenale, D.;Diomede, M.;Dipace, F.;Giribono, A.;Magnisi, L.;Marongiu, M.;Mostacci, A.;Scifo, J.;Vaccarezza, C.;Zigler, A.
2021

Abstract

Next-generation plasma-based accelerators can push elec-tron bunches to gigaelectronvolt energies within centimetre distances. The plasma, excited by a driver pulse, generates large electric fields that can efficiently accelerate a trailing witness bunch, enabling the realization of laboratory-scale applications ranging from high-energy colliders to ultrabright light sources. So far, several experiments have demonstrated large accelerations but the resulting beam quality, par-ticularly the energy spread, is still far from state-of-the-art conventional accelerators. Here we show the results of a beam-driven plasma acceleration experiment where we used an electron bunch as a driver followed by an ultrashort wit-ness bunch. By setting a positive energy chirp on the witness bunch, its longitudinal phase space is rotated during accel-eration, resulting in an ultralow energy spread that is even lower than the spread at the plasma entrance. This result will significantly impact the optimization of the plasma accelera-tion process and its implementation in forthcoming compact machines for user-oriented applications.
plasma-based accelerators; plasma physics; energy spread
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Energy spread minimization in a beam-driven plasma wakefield accelerator / Pompili, R.; Alesini, D.; Anania, M. P.; Behtouei, M.; Bellaveglia, M.; Biagioni, A.; Bisesto, F. G.; Cesarini, M.; Chiadroni, E.; Cianchi, A.; Costa, G.; Croia, M.; Del Dotto, A.; Di Giovenale, D.; Diomede, M.; Dipace, F.; Ferrario, M.; Giribono, A.; Lollo, V.; Magnisi, L.; Marongiu, M.; Mostacci, A.; Piersanti, L.; Di Pirro, G.; Romeo, S.; Rossi, A. R.; Scifo, J.; Shpakov, V.; Vaccarezza, C.; Villa, F.; Zigler, A.. - In: NATURE PHYSICS. - ISSN 1745-2473. - 17:4(2021), pp. 499-503. [10.1038/s41567-020-01116-9]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1498716
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