Experimental Observation of Plasma Wakefield Growth Driven by the Seeded Self-Modulation of a Proton Bunch

M. Turner, E. Adli, A. Ahuja, O. Apsimon, R. Apsimon, A. M. Bachmann, M. Barros Marin, D. Barrientos, F. Batsch, J. Batkiewicz, J. Bauche, V. K. Berglyd Olsen, M. Bernardini, B. Biskup, A. Boccardi, T. Bogey, T. Bohl, C. Bracco, F. Braunmüller, S. BurgerG. Burt, S. Bustamante, B. Buttenschön, A. Caldwell, M. Cascella, J. Chappell, E. Chevallay, M. Chung, D. Cooke, H. Damerau, L. Deacon, L. H. Deubner, A. Dexter, S. Doebert, J. Farmer, V. N. Fedosseev, G. Fior, R. Fiorito, R. A. Fonseca, F. Friebel, L. Garolfi, S. Gessner, I. Gorgisyan, A. A. Gorn, E. Granados, Olaf Grulke, E. Gschwendtner, A. Guerrero, J. Hansen, A. Helm, J. R. Henderson, C. Hessler, W. Hofle, M. Hüther, M. Ibison, L. Jensen, S. Jolly, F. Keeble, S. Y. Kim, F. Kraus, T. Lefevre, G. Legodec, Y. Li, Sihang Liu, N. Lopes, K. V. Lotov, L. Maricalva Brun, M. Martyanov, S. Mazzoni, D. Medina Godoy, V. A. Minakov, J. Mitchell, J. C. Molendijk, R. Mompo, J. T. Moody, M. Moreira, P. Muggli, E. Öz, E. Ozturk, C. Mutin, C. Pasquino, A. Pardons, F. Peña Asmus, K. Pepitone, A. Perera, A. Petrenko, S. Pitman, G. Plyushchev, A. Pukhov, S. Rey, K. Rieger, H. Ruhl, J. S. Schmidt, I. A. Shalimova, E. Shaposhnikova, P. Sherwood, L. O. Silva, L. Soby, A. P. Sosedkin, R. Speroni, R. I. Spitsyn, P. V. Tuev, F. Velotti, L. Verra, V. A. Verzilov, J. Vieira, H. Vincke, C. P. Welsch, B. Williamson, M. Wing, B. Woolley, G. Xia

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Abstract

We measure the effects of transverse wakefields driven by a relativistic proton bunch in plasma with densities of 2.1×1014 and 7.7×1014 electrons/cm3. We show that these wakefields periodically defocus the proton bunch itself, consistently with the development of the seeded self-modulation process. We show that the defocusing increases both along the bunch and along the plasma by using time resolved and time-integrated measurements of the proton bunch transverse distribution. We evaluate the transverse wakefield amplitudes and show that they exceed their seed value (< 15 MV=m) and reach over 300 MV=m. All these results confirm the development of the seeded self-modulation process, a necessary condition for external injection of low energy and acceleration of electrons to multi-GeV energy levels.
Original languageEnglish
Article number054801
JournalPhysical Review Letters
Volume122
Issue number5
Number of pages7
ISSN0031-9007
DOIs
Publication statusPublished - 2019

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