1. Proton Bunch Self-Modulation in Plasma with Density Gradient
- Author
-
Eric Chevallay, V. A. Minakov, F. Keeble, Linbo Liang, Ans Pardons, F. Friebel, J. R. Henderson, M. A. Baistrukov, Stefano Mazzoni, M. Turner, Yu Li, F. Batsch, Ivo Furno, L. Verra, M. Granetzny, H. Saberi, Philip Burrows, V. Hafych, Carsten Welsch, J. T. Moody, M. Hüther, Guoxing Xia, Benjamin Woolley, M. Á. Kedves, P. Blanchard, P. V. Tuev, V. A. Verzilov, J. Chappell, M. Chung, Florian Kraus, R. I. Spitsyn, Ricardo Fonseca, T. Nechaeva, A. Perera, Olaf Grulke, M. Krupa, M. Aladi, R. Fiorito, S. Liu, Brennan Goddard, A. Helm, Nelson Lopes, I. Gorgisyan, Erik Adli, E. Senes, Ambrogio Fasoli, Patric Muggli, M. Zepp, S. Doebert, L. H. Deubner, Spencer Gessner, D. Medina Godoy, Rebecca Ramjiawan, M. Martyanov, S. Rey, Hartmut Ruhl, M. Moreira, Alan Howling, H. Panuganti, Amos Dexter, Simon Jolly, R. Jacquier, D. A. Cooke, Edda Gschwendtner, G. Zevi della Porta, G. P. Djotyan, T. Lefevre, M. Bergamaschi, J. Pucek, L. Garolfi, B. Williamson, Matthew Wing, H. Damerau, A. A. Gorn, V. N. Fedosseev, Eduardo Granados, I. Yu. Kargapolov, Francesco Velotti, Robert Apsimon, Sung Youb Kim, B. Buttenschön, O. Apsimon, Luis O. Silva, F. Braunmüller, B. Ráczkevi, Alexander Pukhov, Anthony Hartin, G. Demeter, M. D. Kelisani, John P. Farmer, Allen Caldwell, R. Agnello, Peter Sherwood, F. Peña Asmus, Jorge Vieira, A.-M. Bachmann, P. I. Morales Guzmán, Konstantin Lotov, J. Wolfenden, C. Davut, Oliver Schmitz, Alexey Petrenko, Y. Andrebe, and Collaboration, AWAKE
- Subjects
Accelerator Physics (physics.acc-ph) ,Proton ,Density gradient ,Other Fields of Physics ,FOS: Physical sciences ,General Physics and Astronomy ,Ciências Naturais::Ciências Físicas [Domínio/Área Científica] ,01 natural sciences ,Physics::Plasma Physics ,physics.plasm-ph ,0103 physical sciences ,010306 general physics ,physics.acc-ph ,Physics ,Linear system ,Spectral density ,Plasma ,Accelerators and Storage Rings ,Physics - Plasma Physics ,Plasma Physics (physics.plasm-ph) ,Modulation ,Physics::Accelerator Physics ,Physics - Accelerator Physics ,Atomic physics ,Phase velocity ,Frequency modulation - Abstract
We study experimentally the effect of linear plasma density gradients on the self-modulation of a 400\,GeV proton bunch. Results show that a positive/negative gradient in/decreases the number of micro-bunches and the relative charge per micro-bunch observed after 10\,m of plasma. The measured modulation frequency also in/decreases. With the largest positive gradient we observe two frequencies in the modulation power spectrum. Results are consistent with changes in wakefields' phase velocity due to plasma density gradient adding to the slow wakefields' phase velocity during self-modulation growth predicted by linear theory., Comment: 14 pages, 4 figures
- Published
- 2020
- Full Text
- View/download PDF