Effect of a nanometer scale plasma on laser-accelerated ion beams

Details Effect of a nanometer scale plasma on laser-accelerated ion beams Effect of a nanometer scale plasma on laser-accelerated ion beams

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11i3036l&link_type=abstract

New Journal of Physics, Volume 11, Issue 9, pp. 093036 (2009).

Physics

1

Scientific paper

Energies of laser-accelerated ions from thin foils in the so-called 'ultra-high-contrast' regime have been measured for various preformed plasma sizes on the non-irradiated foil surface. Whereas energies of protons accelerated in the laser counter-propagating direction remain almost constant for plasma scale length up to 300 nm, we found that plasmas as short as a few tens of nanometers reduce the maximum energy of ions accelerated in the laser direction. These experimental measurements are numerically confirmed with two-dimensional particle-in-cell simulations coupled to hydrodynamic calculation. Moreover, our experimental results, supported by simulations, provide evidence for the occurrence of ion wave breaking, and demonstrate its ability to mitigate the ion energy reduction due to the plasma gradient. This wave breaking is observed and characterized for both proton and carbon ion components.

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