We report the experimental results of proton acceleration as well as the simple one-dimensional model which explains our experimental data. The proton acceleration experiment is carried out with a TW short pulse laser irradiated on a tantalum thin-foil target (3 μm thickness) with an intensity of ∼3×1018 Wcm−2. Accelerated protons exhibit a typical energy spectrum with two quasi-Maxwellian components...
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