NAPAC2016 - List of Authors (Lotov, K.V.)

Paper	Title	Page
WEPOA09	Proton Beam Defocusing as a Result of Self-Modulation in Plasma	707
SUPO47	use link to see paper's listing under its alternate paper code
	M. Turner, E. Gschwendtner, A.V. Petrenko CERN, Geneva, Switzerland K.V. Lotov, A. Sosedkin Budker INP & NSU, Novosibirsk, Russia
	Funding: CERN The AWAKE experiment will use a 400 GeV/c proton beam with a longitudinal bunch length of sigmq_z = 12 cm to create and sustain GV/m plasma wakefields over 10 meters. A 12 cm long bunch can only drive strong wakefields in a plasma with n_pe = 7 x 10¹⁴ electrons/cm³ after the self-modulation instability (SMI) developed and microbunches formed, spaced at the plasma wavelength. The fields present during SMI focus and defocus the protons in the transverse plane. We show that by inserting two imaging screens downstream the plasma, we can measure the maximum defocusing angle of the defocused protons for plasma densities above n_pe = 5 x10¹⁴ electrons/cm³. Measuring maximum defocusing angles around 1 mrad indirectly proves that SMI developed successfully and that GV/m plasma wakefields were created. In this paper we present numerical studies on how and when the wakefields defocus protons in plasma, the expected measurement results of the two screen diagnostics and the physics we can deduce from it.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA09
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Paper

Title

Page

WEPOA09

Proton Beam Defocusing as a Result of Self-Modulation in Plasma

707

SUPO47

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

M. Turner, E. Gschwendtner, A.V. Petrenko
CERN, Geneva, Switzerland
K.V. Lotov, A. Sosedkin
Budker INP & NSU, Novosibirsk, Russia

Funding: CERN
The AWAKE experiment will use a 400 GeV/c proton beam with a longitudinal bunch length of sigmq_z = 12 cm to create and sustain GV/m plasma wakefields over 10 meters. A 12 cm long bunch can only drive strong wakefields in a plasma with n_pe = 7 x 10¹⁴ electrons/cm³ after the self-modulation instability (SMI) developed and microbunches formed, spaced at the plasma wavelength. The fields present during SMI focus and defocus the protons in the transverse plane. We show that by inserting two imaging screens downstream the plasma, we can measure the maximum defocusing angle of the defocused protons for plasma densities above n_pe = 5 x10¹⁴ electrons/cm³. Measuring maximum defocusing angles around 1 mrad indirectly proves that SMI developed successfully and that GV/m plasma wakefields were created. In this paper we present numerical studies on how and when the wakefields defocus protons in plasma, the expected measurement results of the two screen diagnostics and the physics we can deduce from it.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-NAPAC2016-WEPOA09

Export •

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