Proton Bunch Self-Modulation in Plasma with Density Gradient

, AWAKE Collaboration (2020) Proton Bunch Self-Modulation in Plasma with Density Gradient. Physical review letters, 125 (26). ISSN 1079-7114

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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 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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
150939
Deposited By:
Deposited On:
26 Jan 2021 12:53
Refereed?:
Yes
Published?:
Published
Last Modified:
17 Feb 2021 09:15