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Article Dans Une Revue Physical Review E Année : 2017

Stimulated Raman scattering in the relativistic regime in near-critical plasmas

Résumé

Interaction of a high-intensity short laser pulse with near-critical plasmas allows us to achieve extremely high coupling efficiency and transfer laser energy to energetic ions. One-dimensional particle-in-cell simulations are considered to detail the processes involved in the energy transfer. A confrontation of the numerical results with the theory highlights a key role played by the process of stimulated Raman scattering in the relativistic regime. The interaction of a 1 ps laser pulse (I∼6×10^18 W/cm^2) with an undercritical (0.5n_c) homogeneous plasma leads to a very high plasma absorption reaching 68% of the laser pulse energy. This permits a homogeneous electron heating all along the plasma and an efficient ion acceleration at the plasma edges and in cavities.

Dates et versions

hal-01473477 , version 1 (21-02-2017)

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Citer

J. G. Moreau, E. d'Humières, R. Nuter, V. T. Tikhonchuk. Stimulated Raman scattering in the relativistic regime in near-critical plasmas. Physical Review E , 2017, 95 (1), pp.013208. ⟨10.1103/PhysRevE.95.013208⟩. ⟨hal-01473477⟩

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