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Article Dans Une Revue Physics of Plasmas Année : 2011

Efficient laser-overdense plasma coupling via surface plasma waves and steady magnetic field generation

Résumé

The efficiency of laser overdense plasma coupling via surface plasma wave excitation is investigated. Two-dimensional particle-in-cell simulations are performed over a wide range of laser pulse intensity from 10 15 to 10 20 W cm À2 lm 2 with electron density ranging from 25 to 100n c to describe the laser interaction with a grating target where a surface plasma wave excitation condition is fulfilled. The numerical studies confirm an efficient coupling with an enhancement of the laser absorption up to 75%. The simulations also show the presence of a localized, quasi-static magnetic field at the plasma surface. Two interaction regimes are identified for low (Ik 2 < 10 17 W cm À2 lm 2) and high (Ik 2 > 10 17 W cm À2 lm 2) laser pulse intensities. At " relativistic " laser intensity, steady magnetic fields as high as $580 MG lm/k 0 at 7 Â 10 19 W cm À2 lm 2 are obtained in the simulations.
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hal-01327425 , version 1 (06-06-2016)

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A Bigongiari, M Raynaud, C Riconda, Anne Héron, A Macchi. Efficient laser-overdense plasma coupling via surface plasma waves and steady magnetic field generation. Physics of Plasmas, 2011, ⟨10.1063/1.3646520⟩. ⟨hal-01327425⟩
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