Laser acceleration of protons using multi-ion plasma gaseous targets and its medical implications

Xi Shao, Tung-Chang Liu, Chuan-Sheng Liu, Bengt Eliasson, Wendell Hill, Jyhpung Wang, Shih-Hung Chen

Research output: Contribution to journalMeeting abstractpeer-review


We present an 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, 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 foil compounds or mixtures, as well as their density and thickness profiles. 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. We compared the effects of modifying the thickness and density of the gaseous targets and showed that the compression of the gaseous target affects significantly in the quasi-monoenergetic property of the proton beams. To assess the feasibility of laser-proton cancer therapy with such a proton accelerator, simulations are carried out to model the interaction of protons with water and determine the depth and lateral dose distribution for particle beams produced from PIC simulation. Comparison between the dosage maps of the proton beams produced with different foil densities and thicknesses is also presented.
Original languageEnglish
JournalBulletin of the American Physical Society
Issue number15
Publication statusPublished - 27 Oct 2014
Event56th Annual Meeting of the APS Division of Plasma Physics - New Orleans, Louisiana, United States
Duration: 27 Oct 201431 Oct 2014


  • laser acceleration
  • multi-ion plasma gaseous targets
  • laser-proton cancer therapy


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