CERN Accelerating science

Article
Report number	arXiv:2208.04585
Title	Acceleration of an Electron Bunch with a Non–Gaussian Transverse Profile in Proton-Driven Plasma Wakefield
Related title	Acceleration of an electron bunch with a non-Gaussian transverse profile in a quasilinear plasma wakefield
Author(s)	Liang, Linbo (Manchester U. ; Daresbury) ; Xia, Guoxing (Manchester U. ; Daresbury) ; Pukhov, Alexander (Heinrich Heine U., Dusseldorf) ; Farmer, John Patrick (CERN ; Munich, Max Planck Inst.)
Publication	2022-10-27
Imprint	2022-08-09
Number of pages	14
In:	Appl. Sciences 12 (2022) 10919
DOI	10.3390/app122110919
Subject category	Accelerators and Storage Rings
Abstract	Beam-driven plasma wakefield accelerators typically use the external injection scheme to ensure controllable beam quality at injection. However, the externally injected witness bunch may exhibit a non-Gaussian transverse density distribution. Using particle-in-cell simulations, we show that the common beam quality factors, such as the normalized RMS emittance and beam radius, do not strongly depend on the initial transverse shapes of the witness beam. Nonetheless, a beam with a highly-peaked transverse spatial profile can achieve a higher fraction of the total beam charge in the core. The same effect can be seen when the witness beam's transverse momentum profile has a peaked non-Gaussian distribution. In addition, we find that an initially non-axisymmetric beam becomes symmetric due to the interaction with the plasma wakefield, and so it does not cause a detrimental effect for the beam acceleration.
Copyright/License	preprint: (License: CC BY-NC-SA 4.0) publication: © 2022-2024 The authors (License: CC-BY-4.0)

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