Self-truncated ionization injection and consequent monoenergetic electron bunches in laser wakefield acceleration

Ming Zeng, Min Chen, Zheng-Ming Sheng, Warren B. Mori, Jie Zhang

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The ionization-induced injection in laser wakefield acceleration has been recently demonstrated to be a promising injection scheme. However, the energy spread controlling in this mechanism remains a challenge because continuous injection in a mixed gas target is usually inevitable. Here, we propose that by use of certain initially unmatched laser pulses, the electron injection can be constrained to the very front region of the mixed gas target, typically in a length of a few hundreds micrometers determined by the laser self-focusing and the wake deformation. As a result, the produced electron beam has narrow energy spread and meanwhile contains tens of pC in charge. Both multidimensional simulations and theoretical analysis illustrate the effectiveness of this scheme.

Original languageEnglish
Article number030701
Number of pages5
JournalPhysics of Plasmas
Issue number3
Early online date11 Mar 2014
Publication statusPublished - 2014


  • charge injection
  • ionization
  • electron beams

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