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A GPU-based general numerical framework for plasma simulations in terms of microscopic kinetic equations with full collision terms

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plasma Science and Technology 2022年第5期24卷 57-63页

作者：张俊杰张鑫彭国良任泽平 Northwest Institute of Nuclear Technology Xi’an 710024People’s Republic of China College of Mechanical and Electrical Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China

We have proposed a general numerical framework for plasma simulations on graphics processing unit clusters based on microscopic kinetic equations with full collision terms.Our numerical algorithm consistently deals with both long-range(classical forces in the Vlasov term)and short-range(quantum processes in the collision term)interactions.Providing the relevant particle masses,charges and types(classical,fermionic or bosonic),as well as the external forces and the matrix elements(in the collisional integral),the algorithm consistently solves the coupled multi-particle kinetic equations.Currently,the framework is being tested and applied in the field of relativistic heavy-ion collisions;extensions to other plasma systems are straightforward.Our framework is a potential and competitive numerical platform for consistent plasma simulations.

关键词： plasma simulations GPU clusters microscopic kinetic equations Jefimenko’s equations relativistic heavy-ion collisions quark–gluon plasma

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Observation and modelling of stimulated Raman scattering driven by an optically smoothed laser beam in experimental conditions relevant for shock ignition

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High Power Laser Science and Engineering 2021年第4期9卷 160-178页

作者： G.Cristoforetti S.Hüller P.Koester L.Antonelli S.Atzeni F.Baffigi D.Batani C.Baird N.Booth M.Galimberti K.Glize A.Héron M.Khan P.Loiseau D.Mancelli M.Notley P.Oliveira O.Renner M.Smid A.Schiavi G.Tran N.C.Woolsey L.A.Gizzi Intense Laser Irradiation Laboratory INO-CNRINO-CNR56124 PisaItaly Centre de Physique Théorique CPHT CNRSIP ParisEcole Polytechnique91128 PalaiseauFrance York plasma Institute Department of PhysicsUniversity of YorkYork YO105DDUK Dipartimento SBAI Universitàdi Roma'La Sapienza'00161 RomaItaly Universitéde Bordeaux CNRSCEACELIA33405 TalenceFrance STFC Rutherford Appleton Lab Central Laser FacilityDidcot SN21SZUK Key Laboratory for Laser plasmas(MOE) Shanghai Jiao Tong UniversityShanghai 200240China CEA DAMDIF91297 ArpajonFrance UniversitéParis-Saclay CEALMCE91680 Bruyeres-le-ChatelFrance Institute of Physics ELI BeamlinesInstitute of Plasma PhysicsCzech Academy of Sciences18221 PragueCzech Republic Helmholtz-Zentrum Dresden-Rossendorf 01328 DresdenGermany

We report results and modelling of an experiment performed at the Target Area West Vulcan laser facility,aimed at investigating laser±plasma interaction in conditions that are of interest for the shock ignition scheme in inertial confinement fusion(ICF),that is,laser intensity higher than 10^(16) W/cm^(2) impinging on a hot(T>1 keV),inhomogeneous and long scalelength pre-formed plasma.Measurements show a significant stimulated Raman scattering(SRS)backscattering(;%-20%of laser energy)driven at low plasma densities and no signatures of two-plasmon decay(TPD)/SRS driven at the quarter critical density region.Results are satisfactorily reproduced by an analytical model accounting for the convective SRS growth in independent laser speckles,in conditions where the reflectivity is dominated by the contribution from the most intense speckles,where SRS becomes saturated.Analytical and kinetic simulations well reproduce the onset of SRS at low plasma densities in a regime strongly affected by non-linear Landau damping and by filamentation of the most intense laser speckles.The absence of TPD/SRS at higher densities is explained by pump depletion and plasma smoothing driven by filamentation.The prevalence of laser coupling in the low-density profile justifies the low temperature measured for hot electrons(7-12 keV),which is well reproduced by numerical simulations.

关键词： plasma simulations shock ignition stimulated Raman scattering inertial confinement fusion laser-plasma interaction

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