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

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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number075004
Number of pages4
JournalPhysical review letters
Volume108
Issue number7
DOIs
StatePublished - 17 Feb 2012

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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