Theoretical and computational studies of the ion energy scaling of the radiation pressure acceleration of an ultra-thin foil by short pulse intense laser irradiation are presented. To obtain a quasi-monoenergetic ion beam with an energy spread of less than 20%, two-dimensional particle-in-cell simulations show that the maximum energy of the quasi-monoenergetic ion beam is limited by self-induced transparency at the density minima caused by the Rayleigh-Taylor instability. For foils of optimal thickness, the time over which Rayleigh-Taylor instability fully develops and transparency occurs is almost independent of the laser amplitude. With a laser power of about one petawatt, quasi-monogenetic protons with 200 MeV and carbon ions with 100 MeV per nucleon can be obtained, suitable for particle therapy applications.
- proton acceleration
- Rayleigh-Taylor instability
- quasi-monoenergetic protons
Liu, T-C., Shao, X., Liu, C-S., Su, J-J., Eliasson, B., Tripathi, V., Dudnikova, G., & Sagdeev, R. Z. (2011). Energetics and energy scaling of quasi-monoenergetic protons in laser radiation pressure acceleration. Physics of Plasmas, 18(12), . https://doi.org/10.1063/1.3672515