Paper

Proton beam defocusing in AWAKE: comparison of simulations and measurements

Cooke, D A, Kelisani, M D, Liang, L, Helm, A, Keeble, F, Mazzoni, S, Ruhl, H, Martyanov, M, Panuganti, H, Fonseca, R A, A -M Bachmann, Demeter, G, Gessner, S, Chung, M, Jacquier, R, Andrebe, Y, Verzilov, V A, Granados, E, Burrows, P N, Woolley, B, Chevallay, E, I Yu Kargapolov, Perera, A, Gorn, A A, Garolfi, L, S -Y Kim, Moody, J T, Batsch, F, Zepp, M, Silva, L O, Goddard, B, Liu, S, Kedves, M A, Lopes, N, Verra, L, Welsch, C P, Turner, M, Chappell, J, Pukhov, A, Spitsyn, R I, D Medina Godoy, Saberi, H, Gorgisyan, I, Bergamaschi, M, Adli, E, Henderson, J R, Gschwendtner, E, Morales Guzman, P I, Senes, E, Wolfenden, J, Davut, C, Aladi, M, Deubner, L H, Huther, M, Lefevre, T, Friebel, F, Caldwell, A, Apsimon, R, Williamson, B, Apsimon, O, Schmitz, O, Pucek, J, Sherwood, P, Fasoli, A, Damerau, H, Buttenschon, B, Fedosseev, V N, Farmer, J, Minakov, V A, Granetzny, M, Rey, S, Baistrukov, M A, Vieira, J, Djotyan, G P, F Pena Asmus, Raczkevi, B, Krupa, M, Ramjiawan, R L, Grulke, O, Moreira, M, Hartin, A, Tuev, P V, The AWAKE Collaboration, Kraus, F, Fiorito, R, Lotov, K V, Velotti, F, Hafych, V, Doebert, S, Pardons, A, Furno, I, Dexter, A, Wing, M, Howling, A, Nechaeva, T, Petre

2020

Overview

In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from the Super Proton Synchrotron (SPS) at CERN. The angular distribution of the protons deflected due to SSM is a quantitative measure of the process, which agrees with simulations by the two-dimensional (axisymmetric) particle-in-cell code LCODE. Agreement is achieved for beam populations between \\(10^{11}\\) and \\(3 \\times 10^{11}\\) particles, various plasma density gradients (\\(-20 \\div 20\\%\\)) and two plasma densities (\\(2\\times 10^{14} \\text{cm}^{-3}\\) and \\(7 \\times 10^{14} \\text{cm}^{-3}\\)). The agreement is reached only in the case of a wide enough simulation box (at least five plasma wavelengths).

• Publisher: Cornell University Library, arXiv.org
• Subject: Angular distribution / Defocusing / Density gradients / Particle in cell technique / Plasma density / Proton beams / Simulation / Synchrotrons