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

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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.
Original languageEnglish
Article number063031
Number of pages10
JournalNew Journal of Physics
Publication statusPublished - 20 Jun 2018


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

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