High quality GeV proton beams from a density-modulated foil target

Details High quality GeV proton beams from a density-modulated foil target High quality GeV proton beams from a density-modulated foil target

2009-06-13

arxiv.org/abs/0906.2455v1

Physics

Plasma Physics

10 pages, 6 figures, submitted to Laser and Particle Beams

Scientific paper

We study proton acceleration from a foil target with a transversely varying density using multi-dimensional Particle-in-Cell (PIC) simulations. In order to reduce electron heating and deformation of the target, circularly polarized Gaussian laser pulses at intensities of the order of 1022Wcm-2 are used. It is shown that when the target density distribution fits that of the laser intensity profile, protons accelerated from the center part of the target have quasi-monoenergetic spectra and are well collimated. In our two-dimensional PIC simulations, the final peak energy can be up to 1.4 GeV with the full-width of half maximum divergence cone of less than 4o. We observe highly efficient energy conversion from the laser to the protons in the simulations.

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