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Formation of double layers and evolution of the distribution functions during ion acceleration driven by a high-intensity short laser pulse normally incident on thin foils

Published online by Cambridge University Press:  02 November 2016

M. Shoucri ,
F. Vidal  and
J-P. Matte
M. Shoucri*
Affiliation:
Institut de Recherche d'Hydro-Québec (IREQ), Varennes, Québec J3X1S1, Canada
F. Vidal
Affiliation:
Institut national de la recherche scientifique (INRS) Centre Énergie, Matériaux et Télécommunications, Varennes, Québec J3X1S2, Canada
J-P. Matte
Affiliation:
Institut national de la recherche scientifique (INRS) Centre Énergie, Matériaux et Télécommunications, Varennes, Québec J3X1S2, Canada
*
Address correspondence and reprint requests to: M. Shoucri, Institut de recherche d'Hydro-Québec (IREQ), Varennes, Québec J3X1S1, Canada. E-mail: magshoucri@gmail.com
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Abstract

We use an Eulerian Vlasov code, which solves the one-dimensional relativistic Vlasov–Maxwell equations for both electrons and ions, to follow in details the evolution of the distribution functions and the mechanism of the formation and evolution of double layers during ion acceleration driven by a high-intensity circularly polarized short laser pulse (12 ω−1 where ω is the laser angular frequency) normally incident on a thin dense foil. We compare three cases with a high-density deuterium plasma target of total thickness 1.767 cω−1 and constant n/ncr = 100, where ncr is the critical density, and where the laser intensity is varied from a situation where the target is opaque to the laser pulse (normalized vector potential or quiver momentum a0 = 80), to a situation where, above a critical laser intensity, a very small fraction of the laser pulse is transmitted through the target (a0 = 90), and finally to a situation where a more important fraction is transmitted through the target (a0 = 100). The dynamics of ion and electron acceleration are quite different in the three cases, and are followed in detail by the Eulerian Vlasov code, which allows an accurate representation of the distribution function. In the intermediate case, the Vlasov code has revealed a remarkably well-developed spiral structure in the phase space of the electron distribution function, which is associated with large sawtooth modulations in the electron density profiles.

Keywords

Laser beamIon accelerationPlasma jetsEulerian Vlasov code
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 4 , December 2016 , pp. 714 - 728
Copyright
Copyright © Cambridge University Press 2016 

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