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Turner, M.; Adli, E.; Ahuja, A.; Apsimon, O.; Apsimon, R.; Bachmann, A. -M.; Marin, M. Barros; Barrientos, D.; Batsch, F.; Batkiewicz, J.; Bauche, J.; Olsen, V. K. Berglyd; Bernardini, M.; Biskup, B.; Boccardi, A.; Bogey, T.; Bohl, T.; Bracco, C.; Braunmüller, F.; Burger, S.; Burt, G.; Bustamante, S.; Buttenschoen, B.; Caldwell, A.; Cascella, M.; Chappell, J.; Chevallay, E.; Chung, M.; Cooke, D.; Damerau, H.; Deacon, L.; Deubner, L. H.; Dexter, A.; Doebert, S.; Farmer, J.; Fedosseev, V. N.; Fior, G.; Fiorito, R.; Fonseca, R. A.; Friebel, F.; Garolfi, L.; Gessner, S.; Gorgisyan, I.; Gorn, A. A.; Granados, E.; Grulke, O.; Gschwendtner, E.; Guerrero, A.; Hansen, J.; Helm, A.; Henderson, J. R.; Hessler, C.; Hofle, W.; Huether, M.; Ibison, M.; Jensen, L.; Jolly, S.; Keeble, F.; Kim, S. -Y.; Kraus, F.; Lefevre, T.; LeGodec, G.; Li, Y.; Liu, S.; Lopes, N.; Lotov, K. V.; Brun, L. Maricalva; Martyanov, M.; Mazzoni, S.; Godoy, D. Medina; Minakov, V. A.; Mitchell, J.; Molendijk, J. C.; Mompo, R.; Moody, J. T.; Moreira, M.; Muggli, P.; Oez, E.; Ozturk, E.; Mutin, C.; Pasquino, C.; Pardons, A.; Asmus, F. Pena; Pepitone, K.; Perera, A.; Petrenko, A.; Pitman, S.; Plyushchev, G.; Pukhov, A.; Rey, S.; Rieger, K.; Ruhl, H.; Schmidt, J. S.; Shalimova, I. A.; Shaposhnikova, E.; Sherwood, P.; Silva, L. O.; Soby, L.; Sosedkin, A. P.; Speroni, R.; Spitsyn, R. I.; Tuev, P. V.; Velotti, F.; Verra, L.; Verzilov, V. A.; Vieira, J.; Vincke, H.; Welsch, C. P.; Williamson, B.; Wing, M.; Woolley, B.; Xia, G. (2019): Experimental Observation of Plasma Wakefield Growth Driven by the Seeded Self-Modulation of a Proton Bunch. In: Physical Review Letters, Vol. 122, No. 5, 054801
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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 x 10(14) and 7.7 x 10(14) electrons/cm(3). 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.

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