[Physique de la collision d'impulsions laser intenses dans les plasmas sous-denses]
Des résultats récents sur l'accélération d'électrons par collision d'impulsions laser intenses et contre propagatives sont présentés. À la collision, l'interférence des deux impulsions conduit à la génération d'une onde stationnaire qui pré-accélère les électrons du plasma qui, par la suite pourront être piégés dans l'onde de sillage. Les diagnostics optiques de la région de collision mettent en évidence des signatures de la présence de cette onde stationnaire. Une revue des résultats d'accélération d'électrons est ensuite présentée : l'utilisation de la technique d'injection par collision d'impulsions permet la production de faisceaux d'électrons stables, réglables et de haute qualité dans la gamme d'énergie 100–200 MeV. Les simulations PIC en trois dimensions révèlent le rôle important de la dynamique nonlinéaire de la propagation du faisceau pompe et son impact sur les performances de l'accélérateur. La prise en compte de ces effets nous a permis d'optimiser la charge à haute énergie du faisceau d'électrons.
We report on recent experimental results on electron acceleration using two counter-propagating ultrashort and ultraintense laser pulses. At the collision, the two pulses drive a standing wave which is able to pre-accelerate plasma electrons which can then be trapped in the plasma wave. Optical diagnostics of the collision reveal signatures of this standing wave. Electron acceleration results in this regime are reviewed: the use of colliding pulses enables the generation of stable, tunable and high quality electron beams at the 100–200 MeV level. Detailed comparisons with 3D Particle in Cell (PIC) simulations give deeper insight on the role of the nonlinear propagation of the pump pulse on the performance of the accelerator. This deeper understanding has allowed us to optimize the beam charge of the accelerator at high energy.
Mot clés : Interaction laser–plasma, Accélération d'électrons, Collision d'impulsions laser
@article{CRPHYS_2009__10_2-3_148_0,
author = {J\'er\^ome Faure and Cl\'ement Rechatin and Ahmed Ben-Ismail and Jaeku Lim and Xavier Davoine and Erik Lefebvre and Victor Malka},
title = {Physics of colliding laser pulses in underdense plasmas},
journal = {Comptes Rendus. Physique},
pages = {148--158},
publisher = {Elsevier},
volume = {10},
number = {2-3},
year = {2009},
doi = {10.1016/j.crhy.2009.03.006},
language = {en},
}
TY - JOUR AU - Jérôme Faure AU - Clément Rechatin AU - Ahmed Ben-Ismail AU - Jaeku Lim AU - Xavier Davoine AU - Erik Lefebvre AU - Victor Malka TI - Physics of colliding laser pulses in underdense plasmas JO - Comptes Rendus. Physique PY - 2009 SP - 148 EP - 158 VL - 10 IS - 2-3 PB - Elsevier DO - 10.1016/j.crhy.2009.03.006 LA - en ID - CRPHYS_2009__10_2-3_148_0 ER -
%0 Journal Article %A Jérôme Faure %A Clément Rechatin %A Ahmed Ben-Ismail %A Jaeku Lim %A Xavier Davoine %A Erik Lefebvre %A Victor Malka %T Physics of colliding laser pulses in underdense plasmas %J Comptes Rendus. Physique %D 2009 %P 148-158 %V 10 %N 2-3 %I Elsevier %R 10.1016/j.crhy.2009.03.006 %G en %F CRPHYS_2009__10_2-3_148_0
Jérôme Faure; Clément Rechatin; Ahmed Ben-Ismail; Jaeku Lim; Xavier Davoine; Erik Lefebvre; Victor Malka. Physics of colliding laser pulses in underdense plasmas. Comptes Rendus. Physique, Volume 10 (2009) no. 2-3, pp. 148-158. doi : 10.1016/j.crhy.2009.03.006. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2009.03.006/
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