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Brunel-Dominated Proton Acceleration with a Few-Cycle Laser Pulse

Abstract : Experimental measurements of backward accelerated protons are presented. The beam is produced when an ultrashort (5 fs) laser pulse, delivered by a kHz laser system, with a high temporal contrast (10 8), interacts with a thick solid target. Under these conditions, proton cutoff energy dependence with laser parameters, such as pulse energy, polarization (from p to s), and pulse duration (from 5 to 500 fs), is studied. Theoretical model and two-dimensional particle-in-cell simulations, in good agreement with a large set of experimental results, indicate that proton acceleration is directly driven by Brunel electrons, in contrast to conventional target normal sheath acceleration that relies on electron thermal pressure.
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M. Veltcheva, A. Borot, C. Thaury, A. Malvache, E. Lefebvre, et al.. Brunel-Dominated Proton Acceleration with a Few-Cycle Laser Pulse. Physical Review Letters, American Physical Society, 2012, 108 (7), pp.075004. ⟨10.1103/PhysRevLett.108.075004⟩. ⟨hal-01166881⟩



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