Laser acceleration of protons using multi-ion plasma gaseous targets

Tung Chang Liu, Xi Shao, Chuan Sheng Liu, Bengt Eliasson, W. T. Hill, Jyhpyng Wang, Shih Hung Chen

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We present a theoretical and numerical study of a novel acceleration scheme by applying a combination of laser radiation pressure and shielded Coulomb repulsion in laser acceleration of protons in multi-species gaseous targets. By using a circularly polarized CO2 laser pulse with a wavelength of 10 μm - much greater than that of a Ti: Sapphire laser - the critical density is significantly reduced, and a high-pressure gaseous target can be used to achieve an overdense plasma. This gives us a larger degree of freedom in selecting the target compounds or mixtures, as well as their density and thickness profiles. By impinging such a laser beam on a carbon-hydrogen target, the gaseous target is first compressed and accelerated by radiation pressure until the electron layer disrupts, after which the protons are further accelerated by the electron-shielded carbon ion layer. An 80 MeV quasi-monoenergetic proton beam can be generated using a half-sine shaped laser beam with a peak power of 70 TW and a pulse duration of 150 wave periods.

Original languageEnglish
Article number023018
JournalNew Journal of Physics
StatePublished - 4 Feb 2015


  • laserplasma acceleration of electrons and ions
  • laserplasma interactions
  • particle-in-cell method
  • relativistic plasmas


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