Proton Bunch Self-Modulation in Plasma with Density Gradient

Braunmüller, F.; Nechaeva, T.; Collboration, AWAKE

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Proton Bunch Self-Modulation in Plasma with Density Gradient

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Braunmüller, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nechaeva, T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Collboration, AWAKE
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

Braunmüller, F., Nechaeva, T., & Collboration, A. (2020). Proton Bunch Self-Modulation in Plasma with Density Gradient. Physical Review Letters, 125, 264801. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-246.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1B7D-F

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.