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Photon and positron production by ultrahigh-intensity laser interaction with various plasma foils

Plasma Science and Technology 2021年第4期23卷 1-8页

作者： Mamat Ali BAKE Arzigul ELAJI School of Physics Science and Technology Xinjiang UniversityUrumqi 830046People’s Republic of China

The generation ofγphotons and positrons using an ultrahigh-intensity laser pulse interacting with various plasma solid foils is investigated with a series of quantum electrodynamic particlein-cell(PIC)*** ultrahigh-intensity lasers interact with plasma foils,a large amount of the laser energy is converted intoγphoton *** simulation results indicate that for a fixed laser intensity with different foil densities,the conversion efficiency of the laser toγphotons and the number of produced photons are highly related to the foil *** determine the optimal foil density by PIC simulations for high conversion efficiencies as approximately 250 times the critical plasma density,and this result agrees very well with our theoretical *** different foil thicknesses are simulated and the effects of foil thickness onγphoton emission and positron production are *** results indicate that optimal foil thickness plays an important role in obtaining the desiredγphoton and positron production according to the foil density and laser ***,a relation between the laser intensity and conversion efficiency is present for the optimal foil density and thickness.

关键词： laser–plasma interaction positron generation γray emission nonlinear compton scattering particle-in-cell(PIC)simulation

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Characteristics of X/γ-ray radiations by intense laser interactions with high-Z solids: The role of bremsstrahlung and radiation reactions

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Matter and Radiation at Extremes 2018年第6期3卷 293-299页

作者： D.Wu W.Yu Y.T.Zhao S.Fritzsche X.T.He State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics201800 ShanghaiChina College of Science Xi'an Jiaotong UniversityXi'an 710049China Helmholtz Institute Jena D-07743 JenaGermany Theoretisch-Physikalisches Institut Friedrich-Schiller-University JenaD-07743 JenaGermany Key Laboratory of HEDP of the Ministry of Education CAPTState Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing100871China

In this work, characteristics of X/γ-ray radiations by intense laser interactions with high-Z solids are investigated by means of a newlydeveloped particle-in-cell (PIC) simulation code. The PIC code takes advantage of the recently developed ionization and collision dynamicsmodels, which make it possible to model different types of materials based on their intrinsic atomic properties. Within the simulations, bothbremsstrahlung and nonlinear compton scatterings have been included. Different target materials and laser intensities are considered forstudying the parameter-dependent features of X/γ-ray radiations. The relative strength and angular distributions of X/γ ray productions frombremsstrahlung and nonlinear compton scatterings are compared to each other. The threshold under which the nonlinear compton scatteringsbecome dominant over bremsstrahlung is also outlined.

关键词： Particle-in-cell simulations Bremsstrahlung nonlinear compton scattering Laser-solid interactions

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