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Giant ElectroMagnetic Pulse generation in short pulse laser experiments

par Caroline CHAMPENOIS - publié le

séminaire du laboratoire
mercredi 2 mars 2016 à 11:00, service 361 du campus Saint-Jérôme

Alexandre Poyé
CELIA (Bordeaux) et laboratoire de Physique de l’ENS-Lyon (Lyon)

co-auteurs :

S. Hulin1 , M. Bailly-Grandvaux1 , J.-L. Dubois1 , J. Ribolzi3 , D. Raffestin3 , M. Bardon3, F. Lubrano-Lavaderci3, E. D’Humières1, J. J. Santos1, Ph. Nicolaï1,
V. Tikhonchuk1

1 Centre Lasers Intenses et Applications, University Bordeaux, CNRS, CEA, Talence 33405, France
2 Univ Lyon, Ens de Lyon, Univ Claude Bernard, CNRS, Laboratoire de Physique, F-69342 Lyon, France
3 CEA/DAM/CESTA, BP 12, Le Barp 33405, France

Résumé :

A continuous progress in increasing the laser intensity opens new domains of physics and applications from inertial confinement fusion to laboratory astrophysics and material processing. However, interaction of intenses laser pulses with matter is accompanied with the side effect called Giant ElectroMagnetic Pulse (GEMP). This is an electromagnetic pulse in the GHz domain that propagates inside the interaction chamber with an amplitude,which can reach the MV/m level [1, 2], as measured on the Omega EP laser facility.

The physics of this phenomena can be summarized as follow [3, 4]. The laser accelerates target electrons, which may escape from the target. A neutralization current comes from the target holder, which acts like an antenna and emits GEMP. The target charge is then the energy source of GEMP and the holder is shaping the frequencies and the directivity of the emission.

The emitted magnetic field and the target charge were measured in a dedicated experiment on the Eclipse facility. We found a linear relation between the charge and the GEMP amplitude independently of the target material and the laser parameters. The comparison of the experiment and a new quantitative model will be presented [5].

[1] M.J. Mead et al., Rev. Sci. Instrum. 75, 4225 (2004)
[2] C.G. Brown Jr. et al., J. Phys. Conf. Ser. 112, 032025 (2008) [3] J.-L. Dubois et al., Phys. Rev. E 89, 013102 (2014)
[4] A. Poyé et al., Physical Review E 91, 043106 (2015)
[5] A. Poyé et al., Physical Review E 92, 043107 (2015)

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