Abstract
We present substantial enhancement of accelerated ion energies up to 10-20 MeV per nucleon by utilizing the unique properties of the cluster-gas target irradiated with 40-fs laser pulse of only 150 mJ energy, corresponding to approximately tenfold increase in ion energies compared to previous experiments using thin foil targets. A particle-in-cell (PIC) simulation infers that the high energy ions are generated at the rear side of the target due to the formation of a strong dipole vortex structure in sub-critical density plasmas.
© 2011 Optical Society of America
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