High-energy monoenergetic proton beams from two stage acceleration with a slow laser pulse

H. Y. Wang, X. Q. Yan, M. Zepf

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
222 Downloads (Pure)


We present a new regime to generate high-energy quasimonoenergetic proton beams in a "slow-pulse" regime, where the laser group velocity vg<c is reduced by an extended near-critical density plasma. In this regime, for properly matched laser intensity and group velocity, ions initially accelerated by the light sail (LS) mode can be further trapped and reflected by the snowplough potential generated by the laser in the near-critical density plasma. These two acceleration stages are connected by the onset of Rayleigh-Taylor-like (RT) instability. The usual ion energy spectrum broadening by RT instability is controlled and high quality proton beams can be generated. It is shown by multidimensional particle-in-cell simulation that quasimonoenergetic proton beams with energy up to hundreds of MeV can be generated at laser intensities of 1021W/cm2.

Original languageEnglish
Article number021302
Number of pages7
Issue number2
Publication statusPublished - 03 Feb 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces
  • Nuclear and High Energy Physics


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