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Phys. Plasmas 8, 542 (2001); http://dx.doi.org/10.1063/1.1333697 (8 pages)
Energetic proton generation in ultra-intense laser–solid interactions
(Received 3 April 2000; accepted 21 August 2000)
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Add to FacebookAn explanation for the energetic ions observed in the PetaWatt experiments is presented. In solid target experiments with focused intensities exceeding 1020 W/cm2, high-energy electron generation, hard bremsstrahlung, and energetic protons have been observed on the backside of the target. In this report, an attempt is made to explain the physical process present that will explain the presence of these energetic protons, as well as explain the number, energy, and angular spread of the protons observed in experiment. In particular, we hypothesize that hot electrons produced on the front of the target are sent through to the back off the target, where they ionize the hydrogen layer there. These ions are then accelerated by the hot electron cloud, to tens of MeV energies in distances of order tens of μm, whereupon they end up being detected in the radiographic and spectrographic detectors. © 2001 American Institute of Physics
© 2001 American Institute of Physics
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