Amplitude enhancement of the self-modulated plasma wakefields

Y. Li, G. Xia, K. V. Lotov, A. P. Sosedkin, Y. Zhao, S. J. Gessner

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Seeded Self-modulation (SSM) has been demonstrated to transform a long proton bunch into many equidistant micro-bunches (e.g., the AWAKE case), which then resonantly excite strong wakefields. However, the wakefields in a uniform plasma suffer from a quick amplitude drop after reaching the peak. This is caused by a significant decrease of the wake phase velocity during self-modulation. A large number of protons slip out of focusing and decelerating regions and get lost, and thus cannot contribute to the wakefield growth. Previously suggested solutions incorporate a sharp or a linear plasma longitudinal density increase which can compensate the backward phase shift and therefore enhance the wakefields. In this paper, we propose a new plasma density profile, which can further boost the wakefield amplitude by 30%. More importantly, almost 24% of protons initially located along one plasma period survive in a micro-bunch after modulation. The underlying physics is discussed.

Original languageEnglish
Article number042009
Number of pages5
JournalJournal of Physics: Conference Series
Volume1067
Issue number4
DOIs
Publication statusPublished - 5 Oct 2018
Event9th International Particle Accelerator Conference, IPAC 2018 - Vancouver, Canada
Duration: 29 Apr 20184 May 2018

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