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| 1 | 3D Monte-Carlo model to study the transport of hot electrons in the context of inertial confinement fusion. Part Ⅰ显示文摘We describe the development of a 3D Monte-Carlo model to study hot-electron transport in ionized or partially ionized targets,considering regimes typical of inertial confinement fusion.Electron collisions are modeled using a mixed simulation algorithm that considers both soft and hard scattering phenomena.Soft collisions are modeled according to multiple-scattering theories,i.e.,considering the global effects of the scattering centers on the primary particle.Hard collisions are simulated by considering a two-body interaction between an electron and a plasma particle.Appropriate differential cross sections are adopted to correctly model scattering in ionized or partially ionized targets.In particular,an analytical form of the differential cross section that describes a collision between an electron and the nucleus of a partially ionized atom in a plasma is proposed.The loss of energy is treated according to the continuous slowing down approximation in a plasma stopping power theory.Validation against Geant4 is presented.The code will be implemented as a module in 3D hydrodynamic codes,providing a basis for the development of robust shock ignition schemes and allowing more precise interpretations of current experiments in planar or spherical geometries. | A.Tentori A.Colaïtis D.Batani | 2022 | Matter and Radiation at Extremes2022，7，6： | 2 |
| 2 | Characterization of hot electrons generated by laser-plasma interaction at shock ignition intensities显示文摘In an experiment carried out at the Prague Asterix Laser System at laser intensities relevant to shock ignition conditions(I>10^(16) W/cm^(2)),the heating and transport of hot electrons were studied by using several complementary diagnostics,i.e.,K_(α)time-resolved imaging,hard x-ray filtering(a bremsstrahlung cannon),and electron spectroscopy.Ablators with differing composition from low Z(parylene N)to high Z(nickel)were used in multilayer planar targets to produce plasmas with different coronal temperature and collisionality and modify the conditions of hot-electron generation.The variety of available diagnostics allowed full characterization of the population of hot electrons,retrieving their conversion efficiency,time generation and duration,temperature,and angular divergence.The obtained results are shown to be consistent with those from detailed simulations and similar inertial confinement fusion experiments.Based on the measured data,the advantages,reliability,and complementarity of the experimental diagnostics are discussed. | E.D.Filippov M.Khan A.Tentori P.Gajdos A.S.Martynenko R.Dudzak P.Koester G.Zeraouli D.Mancelli F.Baffigi L.A.Gizzi S.A.Pikuz Ph.D.Nicolaï N.C.Woolsey R.Fedosejevs M.Krus L.Juha D.Batani O.Renner G.Cristoforetti | 2023 | Matter and Radiation at Extremes2023，8，6： | 0 |
| 3 | Multibeam laser-plasma interaction at the Gekko XII laser facility in conditions relevant for direct-drive inertial confinement fusion显示文摘Laser–plasma interaction and hot electrons have been characterized in detail in laser irradiation conditions relevant for direct-drive inertial confinement fusion.The experiment was carried out at the Gekko XII laser facility in multibeam planar target geometry at an intensity of approximately 3×10^(15)W/cm^(2).Experimental data suggest that high-energy electrons,with temperatures of 20–50 keV and conversion efficiencies ofη<1%,were mainly produced by the damping of electron plasma waves driven by two-plasmon decay(TPD).Stimulated Raman scattering(SRS)is observed in a near-threshold growth regime,producing a reflectivity of approximately 0.01%,and is well described by an analytical model accounting for the convective growth in independent speckles.The experiment reveals that both TPD and SRS are collectively driven by multiple beams,resulting in a more vigorous growth than that driven by single-beam laser intensity. | G.Cristoforetti P.Koester S.Atzeni D.Batani S.Fujioka Y.Hironaka S.Hüller T.Idesaka K.Katagiri K.Kawasaki R.Kodama D.Mancelli Ph.Nicolai N.Ozaki A.Schiavi K.Shigemori R.Takizawa T.Tamagawa D.Tanaka A.Tentori Y.Umeda A.Yogo L.A.Gizzi | 2023 | High Power Laser Science and Engineering2023，11，2： | 0 |
| 4 | 3D Monte-Carlo model to study the transport of hot electrons in the context of inertial confinement fusion. Part Ⅱ显示文摘We describe two numerical investigations performed using a 3D plasma Monte-Carlo code,developed to study hot-electron transport in the context of inertial confinement fusion.The code simulates the propagation of hot electrons in ionized targets,using appropriate scattering differential cross sections with free plasma electrons and ionized or partially ionized atoms.In this paper,we show that a target in the plasma state stops and diffuses electrons more effectively than a cold target(i.e.,a target under standard conditions in which ionization is absent).This is related to the fact that in a plasma,the nuclear potential of plasma nuclei has a greater range than in the cold case,where the screening distance is determined by the electronic structure of atoms.However,in the ablation zone created by laser interaction,electrons undergo less severe scattering,counterbalancing the enhanced diffusion that occurs in the bulk.We also show that hard collisions,i.e.,collisions with large polar scattering angle,play a primary role in electron beam diffusion and should not be neglected.An application of the plasma MonteCarlo model to typical shock ignition implosions suggests that hot electrons will not give rise to any preheating concerns if their Maxwellian temperature is lower than 25–30 keV,although the presence of populations at higher temperatures must be suppressed.This result does not depend strongly on the initial angular divergence of the electron beam set in the simulations. | A.Tentori A.Colaïtis D.Batani | 2022 | Matter and Radiation at Extremes2022，7，6： | 0 |
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