IPAC2018 - List of Authors (Lotov, K.V.)

Paper	Title	Page
TUPML023	Amplitude Enhancement of the Self-Modulated Plasma Wakefields	1585
SUSPF042	use link to see paper's listing under its alternate paper code
	Y. M. Li, G.X. Xia, Y. Zhao UMAN, Manchester, United Kingdom K.V. Lotov, A. Sosedkin Budker INP & NSU, Novosibirsk, Russia
	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.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPML023
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Paper

Title

Page

TUPML023

Amplitude Enhancement of the Self-Modulated Plasma Wakefields

1585

SUSPF042

use link to see paper's listing under its alternate paper code

Y. M. Li, G.X. Xia, Y. Zhao
UMAN, Manchester, United Kingdom
K.V. Lotov, A. Sosedkin
Budker INP & NSU, Novosibirsk, Russia

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.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2018-TUPML023

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)