Article

Hard X radiation and fast particles in laser plasma experiments at laser intensities of up to 5×1018 W/cm2 on the target surface

JETP Letters (Impact Factor: 1.36). 02/2000; 71(6):246-249. DOI: 10.1134/1.568326

ABSTRACT

Results are presented from an investigation of the hard X-ray spectrum and the parameters of fast particles in experiments
on the interaction of laser pulses with solid targets in the PROGRESS-P facility at laser intensities of up to 5×1018 W/cm2 on the target surface. The maximum energy of fast electrons obtained from direct measurements is found to be 8–10 MeV.

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    ABSTRACT: The parameters of fast particles generated upon the interaction of 1019 W/cm2 laser pulses with solid targets are studied. The spatial and energy parameters of fast ions are investigated. It is found that approximately 1–3% of the laser energy is transformed to the energy of mega-and submegaelectronvolt ions at laser pulse intensities ≥1018 W/cm2. It is shown experimentally that an ion beam is directed perpendicular to the target surface. The analytic and numerical simulations agree with experimental results and predict the propagation of fast electrons in the mirror direction with respect to the incident laser beam and of ions perpendicular to the target. The theoretical calculations are compared with the experimental output and spectra of fast electrons and ions.
    No preview · Article · Jan 2002 · Journal of Experimental and Theoretical Physics
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    ABSTRACT: The acceleration of ions of different species from a plasma slab under the action of a charge-separation electric field driven by hot and cold electrons is studied by using a hybrid Boltzmann-Vlasov-Poisson model. The obtained spatial and energy distributions of light and heavy ions in different charge states demonstrate that the model can be efficiently used to study the ion composition in a multispecies expanding laser plasma. The regular features of the acceleration of ions of different species are investigated. The formation of compression and rarefaction waves in the halo of light ion impurity, as well as their effect on the energy spectrum of the accelerated ions, is analyzed. An approach is proposed that makes it possible to describe the production of fast ions by laser pulses of a given shape. It is shown that the energy of fast ions can be increased markedly by appropriately shaping the pulse. The effect of heating of the bulk of the cold target electrons on the ion acceleration is discussed.
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