Brunel-Dominated Proton Acceleration with a Few-Cycle Laser PulseReport as inadecuate

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1 ENSTA ParisTech École polytechnique CNRS LOA - Laboratoire d-optique appliquée 2 INMED - Institut de neurobiologie de la Méditérranée 3 DPTA - Département de Physique Théorique et Appliquée

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.

Author: M. Veltcheva - A. Borot - C. Thaury - A. Malvache - E. Lefebvre - A. Flacco - R. Lopez-Martens - V. Malka -



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