Laser acceleration of protons using multi-ion plasma gaseous targets

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

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10 Citations (Scopus)
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We present a theoretical and numerical study of the 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 peak power 70 TW and pulse duration of 150 wave periods.
Original languageEnglish
Article number023018
Number of pages9
JournalNew Journal of Physics
Issue number2
Publication statusPublished - 4 Feb 2015


  • gaseous targets
  • laser accelerated protons
  • laser acceleration


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