Collisionless shock acceleration of protons in a plasma slab produced in a gas jet by the collision of two laser-driven hydrodynamic shockwaves  

作　　者：J.-R.Marquès L.Lancia P.Loiseau P.Forestier-Colleoni M.Tarisien E.Atukpor V.Bagnoud C.Brabetz F.Consoli J.Domange F.Hannachi P.Nicolaï M.Salvadori B.Zielbauer 

机构地区：[1]LULI,CNRS,École Polytechnique,CEA,Sorbonne Université,Institut Polytechnique de Paris,91128 Palaiseau Cedex,France [2]CEA,DAM,DIF,91297 Arpajon Cedex,France [3]UniversitéParis-Saclay,CEA,LMCE,91680 Bruyères-le-Chatel,France [4]CENBG,CNRS-IN2P3,Universitéde Bordeaux,33175 Gradignan Cedex,France [5]GSI Helmholtzzentrum für Schwerionenforschung GmbH,Planckstraße 1,64291 Darmstadt,Germany [6]University of Darmstadt,Schloßgartenstr.,764289 Darmstadt,Germany [7]ENEA Fusion and Technologies for Nuclear Safety Department,C.R.Frascati,Via Enrico Fermi 45,Frascati,Rome,Italy [8]CELIA,Universitéde Bordeaux–CNRS–CEA,33405 Talence,France [9]UniversitéParis-Saclay,CEA,LIDYL,91191 Gif-sur-Yvette,France

出　　处：《Matter and Radiation at Extremes》2024年第2期12-25,共14页极端条件下的物质与辐射（英文）

基　　金：funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No.871124 Laserlab-Europe;by Grant No.ANR-17-CE30-0026-Pinnacle from the Agence Nationale de la Recherche.

摘　　要：We have recently proposed a new technique of plasma tailoring by laser-driven hydrodynamic shockwaves generated on both sides of a gas jet[Marquès et al.,Phys.Plasmas 28,023103(2021)].In a continuation of this numerical work,we study experimentally the influence of the tailoring on proton acceleration driven by a high-intensity picosecond laser in three cases:without tailoring,by tailoring only the entrance side of the picosecond laser,and by tailoring both sides of the gas jet.Without tailoring,the acceleration is transverse to the laser axis,with a low-energy exponential spectrum,produced by Coulomb explosion.When the front side of the gas jet is tailored,a forward acceleration appears,which is significantly enhanced when both the front and back sides of the plasma are tailored.This forward acceleration produces higher-energy protons,with a peaked spectrum,and is in good agreement with the mechanism of collisionless shock acceleration(CSA).The spatiotemporal evolution of the plasma profile is characterized by optical shadowgraphy of a probe beam.The refraction and absorption of this beam are simulated by post-processing 3D hydrodynamic simulations of the plasma tailoring.Comparison with the experimental results allows estimation of the thickness and near-critical density of the plasma slab produced by tailoring both sides of the gas jet.These parameters are in good agreement with those required for CSA.

关 键 词：acceleration HYDRODYNAMIC COLLISION 

分 类 号：O57[理学—粒子物理与原子核物理]