학술논문
Energy spread minimization in a beam-driven plasma wakefield accelerator
Document Type
Working Paper
Author
Pompili, R.; 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.; Di Pirro, G.; Romeo, S.; Rossi, A. R.; Scifo, J.; Shpakov, V.; Vaccarezza, C.; Villa, F.; Zigler, A.
Source
Subject
Language
Abstract
Next-generation plasma-based accelerators can push electron 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 making possible the realization of laboratory-scale applications ranging from high-energy colliders to ultra-bright light sources. So far several experiments have demonstrated a significant acceleration but the resulting beam quality, especially 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 ultra-short witness. The experiment demonstrates, for the first time, an innovative method to achieve an ultra-low energy spread of the accelerated witness of about 0.1%. This is an order of magnitude smaller than what has been obtained so far. The result can lead to a major breakthrough toward the optimization of the plasma acceleration process and its implementation in forthcoming compact machines for user-oriented applications.