Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma

(AWAKE Collaboration), L. Verra*, G. Zevi Della Porta, J. Pucek, T. Nechaeva, S. Wyler, M. Bergamaschi, E. Senes, E. Guran, J. T. Moody, M. Kedves, E. Gschwendtner, P. Muggli, R. Agnello, C. C. Ahdida, M. C.A. Goncalves, Y. Andrebe, O. Apsimon, R. Apsimon, J. M. ArnesanoA. M. Bachmann, D. Barrientos, F. Batsch, V. Bencini, P. Blanchard, P. N. Burrows, B. Buttenschön, A. Caldwell, J. Chappell, E. Chevallay, M. Chung, D. A. Cooke, C. Davut, G. Demeter, A. C. Dexter, S. Doebert, F. A. Elverson, J. Farmer, A. Fasoli, V. Fedosseev, R. Fonseca, I. Furno, A. Gorn, E. Granados, M. Granetzny, T. Graubner, O. Grulke, V. Hafych, J. Henderson, M. Hüther, V. Khudiakov

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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A long, narrow, relativistic charged particle bunch propagating in plasma is subject to the self-modulation (SM) instability. We show that SM of a proton bunch can be seeded by the wakefields driven by a preceding electron bunch. SM timing reproducibility and control are at the level of a small fraction of the modulation period. With this seeding method, we independently control the amplitude of the seed wakefields with the charge of the electron bunch and the growth rate of SM with the charge of the proton bunch. Seeding leads to larger growth of the wakefields than in the instability case.

Original languageEnglish
Article number024802
JournalPhysical Review Letters
Issue number2
Number of pages7
Publication statusPublished - 2022


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