Dense attosecond electron sheets from laser wakefields using an up-ramp density transition

F.Y. Li, Z.M. Sheng, Y. Liu, J. Meyer-ter-Vehn, W.B. Mori, W. Lu, J. Zhang

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Controlled electron injection into a laser-driven wakefield at a well defined space and time is reported based on particle-in-cell simulations. Key novel ingredients are an underdense plasma target with an up-ramp density profile followed by a plateau and a fairly large laser focus diameter that leads to an essentially one-dimensional (1D) regime of laser wakefield, which is different from the bubble (complete blowout) regime occurring for tightly focused drive beams. The up-ramp profile causes 1D wave breaking to occur sharply at the up-ramp-plateau transition. As a result, it generates an ultrathin (few nanometer, corresponding to attosecond duration), strongly overdense relativistic electron sheet that is injected and accelerated in the wakefield. A peaked electron energy spectrum and high charge (∼nC) distinguish the final sheet.
Original languageEnglish
Article number135002
Number of pages5
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 26 Mar 2013


  • dense attosecond electron sheets
  • laser wakefields
  • up-ramp density transition


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