Ionization injection in a laser wakefield accelerator subject to a transverse magnetic field

Q Zhao, S M Weng, Z M Sheng, M Chen, G B Zhang, W B Mori, B Hidding, D A Jaroszynski, J Zhang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effect of an external transverse magnetic field on ionization injection of electrons in a laser wakefield accelerator (LWFA) is investigated by theoretical analysis and particle-in-cell simulations. On application of a few tens of Tesla magnetic field, both the electron trapping condition and the wakefield structure changes significantly such that injection occurs over a shorter distance and at an enhanced rate. Furthermore, beam loading is compensated for, as a result of the intrinsic trapezoidal-shaped longitudinal charge density profile of injected electrons. The nonlinear ionization injection and consequent compensation of beam loading lead to a reduction in the energy spread and an enhancement of both the charge and final peak energy of the electron beam from a LWFA immersed in the magnetic field.
LanguageEnglish
Article number063031
Number of pages10
JournalNew Journal of Physics
Volume20
DOIs
Publication statusPublished - 20 Jun 2018

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accelerators
injection
ionization
magnetic fields
lasers
electrons
trapping
electron beams
energy
augmentation
profiles
cells
simulation

Keywords

  • laser wakefield accelerator (LWFA)
  • particle-in-cell simulations
  • beam loading
  • electron injection

Cite this

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title = "Ionization injection in a laser wakefield accelerator subject to a transverse magnetic field",
abstract = "The effect of an external transverse magnetic field on ionization injection of electrons in a laser wakefield accelerator (LWFA) is investigated by theoretical analysis and particle-in-cell simulations. On application of a few tens of Tesla magnetic field, both the electron trapping condition and the wakefield structure changes significantly such that injection occurs over a shorter distance and at an enhanced rate. Furthermore, beam loading is compensated for, as a result of the intrinsic trapezoidal-shaped longitudinal charge density profile of injected electrons. The nonlinear ionization injection and consequent compensation of beam loading lead to a reduction in the energy spread and an enhancement of both the charge and final peak energy of the electron beam from a LWFA immersed in the magnetic field.",
keywords = "laser wakefield accelerator (LWFA), particle-in-cell simulations, beam loading, electron injection",
author = "Q Zhao and Weng, {S M} and Sheng, {Z M} and M Chen and Zhang, {G B} and Mori, {W B} and B Hidding and Jaroszynski, {D A} and J Zhang",
year = "2018",
month = "6",
day = "20",
doi = "10.1088/1367-2630/aac926",
language = "English",
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Ionization injection in a laser wakefield accelerator subject to a transverse magnetic field. / Zhao, Q; Weng, S M; Sheng, Z M; Chen, M; Zhang, G B; Mori, W B; Hidding, B; Jaroszynski, D A; Zhang, J.

In: New Journal of Physics, Vol. 20, 063031, 20.06.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ionization injection in a laser wakefield accelerator subject to a transverse magnetic field

AU - Zhao, Q

AU - Weng, S M

AU - Sheng, Z M

AU - Chen, M

AU - Zhang, G B

AU - Mori, W B

AU - Hidding, B

AU - Jaroszynski, D A

AU - Zhang, J

PY - 2018/6/20

Y1 - 2018/6/20

N2 - The effect of an external transverse magnetic field on ionization injection of electrons in a laser wakefield accelerator (LWFA) is investigated by theoretical analysis and particle-in-cell simulations. On application of a few tens of Tesla magnetic field, both the electron trapping condition and the wakefield structure changes significantly such that injection occurs over a shorter distance and at an enhanced rate. Furthermore, beam loading is compensated for, as a result of the intrinsic trapezoidal-shaped longitudinal charge density profile of injected electrons. The nonlinear ionization injection and consequent compensation of beam loading lead to a reduction in the energy spread and an enhancement of both the charge and final peak energy of the electron beam from a LWFA immersed in the magnetic field.

AB - The effect of an external transverse magnetic field on ionization injection of electrons in a laser wakefield accelerator (LWFA) is investigated by theoretical analysis and particle-in-cell simulations. On application of a few tens of Tesla magnetic field, both the electron trapping condition and the wakefield structure changes significantly such that injection occurs over a shorter distance and at an enhanced rate. Furthermore, beam loading is compensated for, as a result of the intrinsic trapezoidal-shaped longitudinal charge density profile of injected electrons. The nonlinear ionization injection and consequent compensation of beam loading lead to a reduction in the energy spread and an enhancement of both the charge and final peak energy of the electron beam from a LWFA immersed in the magnetic field.

KW - laser wakefield accelerator (LWFA)

KW - particle-in-cell simulations

KW - beam loading

KW - electron injection

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DO - 10.1088/1367-2630/aac926

M3 - Article

VL - 20

JO - New Journal of Physics

T2 - New Journal of Physics

JF - New Journal of Physics

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