학술논문
Proton beam defocusing in AWAKE: comparison of simulations and measurements
Document Type
Working Paper
Author
Gorn, A. A.; Turner, M.; Adli, E.; Agnello, R.; Aladi, M.; Andrebe, Y.; Apsimon, O.; Apsimon, R.; Bachmann, A. -M.; Baistrukov, M. A.; Batsch, F.; Bergamaschi, M.; Blanchard, P.; Burrows, P. N.; Buttenschon, B.; Caldwell, A.; Chappell, J.; Chevallay, E.; Chung, M.; Cooke, D. A.; Damerau, H.; Davut, C.; Demeter, G.; Deubner, L. H.; Dexter, A.; Djotyan, G. P.; Doebert, S.; Farmer, J.; Fasoli, A.; Fedosseev, V. N.; Fiorito, R.; Fonseca, R. A.; Friebel, F.; Furno, I.; Garolfi, L.; Gessner, S.; Goddard, B.; Gorgisyan, I.; Granados, E.; Granetzny, M.; Grulke, O.; Gschwendtner, E.; Hafych, V.; Hartin, A.; Helm, A.; Henderson, J. R.; Howling, A.; Huther, M.; Jacquier, R.; Kargapolov, I. Yu.; Kedves, M. A.; Keeble, F.; Kelisani, M. D.; Kim, S. -Y.; Kraus, F.; Krupa, M.; Lefevre, T.; Liang, L.; Liu, S.; Lopes, N.; Lotov, K. V.; Martyanov, M.; Mazzoni, S.; Godoy, D. Medina; Minakov, V. A.; Moody, J. T.; Guzman, P. I. Morales; Moreira, M.; Nechaeva, T.; Panuganti, H.; Pardons, A.; Asmus, F. Pena; Perera, A.; Petrenko, A.; Pucek, J.; Pukhov, A.; Raczkevi, B.; Ramjiawan, R. L.; Rey, S.; Ruhl, H.; Saberi, H.; Schmitz, O.; Senes, E.; Sherwood, P.; Silva, L. O.; Spitsyn, R. I.; Tuev, P. V.; Velotti, F.; Verra, L.; Verzilov, V. A.; Vieira, J.; Welsch, C. P.; Williamson, B.; Wing, M.; Wolfenden, J.; Woolley, B.; Xia, G.; Zepp, M.; Della Porta, G. Zevi
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Subject
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Abstract
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).
Comment: 8 pages, 9 figures, 1 table
Comment: 8 pages, 9 figures, 1 table