Acceleration and radiation of externally injected electrons in laser plasma wakefield driven by a Laguerre-Gaussian pulse

Zhong-Chen Shen, Min Chen, Guo-Bo Zhang, Ji Luo, Su-Ming Weng, Xiao-Hui Yuan, Feng Liu, Zheng-Ming Sheng

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By using three-dimensional particle-in-cell simulations, externally injected electron beam acceleration and radiation in donut-like wake fields driven by a LaguerreGaussian pulse are investigated. Studies show that in the acceleration process the total charge and azimuthal momenta of electrons can be stably maintained at a distance of a few hundreds of micrometers. Electrons experience low-frequency spiral rotation and high-frequency betatron oscillation, which leads to a synchrotron-like radiation. The radiation spectrum is mainly determined by the betatron motion of electrons. The far field distribution of radiation intensity shows axial symmetry due to the uniform transverse injection and spiral rotation of electrons. Our studies suggest a new way to simultaneously generate hollow electron beam and radiation source from a compact laser plasma accelerator.

Original languageEnglish
Article number115204
Number of pages5
JournalChinese Physics B
Issue number11
Early online date29 Sep 2017
Publication statusPublished - 30 Nov 2017


  • Laguerre-Gaussian pulse
  • laser plasma accelerator
  • particle-in-cell simulations

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