Proton Bunch Self-Modulation in Plasma with Density Gradient

Braunmüller, F.; Nechaeva, T.; 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.; Buttenschön, 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.; Gorn, A.  A.; Granados, E.; Granetzny, M.; Grulke, O.; Gschwendtner, E.; Hafych, V.; Hartin, A.; Helm, A.; Henderson, J.  R.; Howling, A.; Hüther, M.; Jacquier, R.; Jolly, S.; Kargapolov, I.  Yu.; Kedves, M.  Á.; Keeble, F.; Kelisani, M.  D.; Kim, S. -Y.; Kraus, F.; Krupa, M.; Lefevre, T.; Li, Y.; Liang, L.; Liu, S.; Lopes, N.; Lotov, K.  V.; Martyanov, M.; Mazzoni, S.; Medina Godoy, D.; Minakov, V.  A.; Moody, J.  T.; Morales Guzmán, P.  I.; Moreira, M.; Muggli, P.; Panuganti, H.; Pardons, A.; Peña Asmus, F.; Perera, A.; Petrenko, A.; Pucek, J.; Pukhov, A.; Ráczkevi, 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.; Turner, M.; Velotti, F.; Verra, L.; Verzilov, V.  A.; Vieira, J.; Welsch, C.  P.; Williamson, B.; Wing, M.; Wolfenden, J.; Woolley, B.; Xia, G.; Zepp, M.; Zevi Della Porta, G.

doi:10.1103/physrevlett.125.264801

Proton Bunch Self-Modulation in Plasma with Density Gradient

Journal Article · Mon Dec 28 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.264801· OSTI ID:1767969

Braunmüller, F.; Nechaeva, T.; 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.; Buttenschön, B.; Caldwell, A.; Chappell, J.; Chevallay, E.; Chung, M.; Cooke, D. A. more »

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 or negative gradient increases or decreases the number of microbunches and the relative charge per microbunch observed after 10 m of plasma. The measured modulation frequency also increases or 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 gradients adding to the slow wakefields’ phase velocity during self-modulation growth predicted by linear theory.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Contributing Organization:: AWAKE Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1767969

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 125; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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