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Progress of Pattern Dynamics in Plasma Waves

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Communications in Computational Physics 2008年第10期4卷 1129-1150页

作者： B.Qiao C.t.Zhou x.t.he C.H.Lai Center for Plasma Physics Department of Physics and AstronomyQueen’s University BelfastBelfast BT71NNUK Department of Physics National University of SingaporeSingapore 117542 Institute of Applied Physics and Computational Mathematics P.O.Box 8009Beijing 100088China Center for Applied Physics and technology Peking UniversityBeijing 100871China Institute for Fusion theory and Simulation Zhejiang UniversityHangzhou 310027China Beijing-Hong Kong-Singapore Joint Centre for Nonlinear&Complex Systems(Singapore) National University of SingaporeSingapore 117542.

this paper is concerned with the pattern dynamics of the generalized nonlinear Schrodinger equations(NSEs)relatedwith various nonlinear physical problems in *** theoretical and numerical results show that the higher-order nonlinear effects,acting as a Hamiltonian perturbation,break down the NSE integrability and lead to chaotic ***,coherent structures are destroyed and replaced by complex *** orbit crossings in the phase space and stochastic partition of energy in Fourier modes show typical characteristics of the stochastic *** investigations show that nonlinear phenomena,such as wave turbulence and laser filamentation,are associated with the homoclinic *** particular,we found that the unstable manifolds W(u)possessing the hyperbolic fixed point correspond to an initial phase θ=45° and 225° ,and the stable manifolds W(s)correspond toθ=135° and 315° .

关键词： Pattern dynamics homoclinic chaos nonlinear Schrodinger equations plasma waves

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

Recent progress in matter in extreme states created by laser

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Matter and Radiation at Extremes 2022年第1期7卷 1-4页

作者： K.Batani D.Batani x.t.he K.Shigemori Institute of Plasma Physics and Laser Micro Fusion WarsawPoland University of Bordeaux CEACNRSUMR 510733405 TalenceFrance Plasma Physics Department National Research Nuclear University MEPhIMoscowRussia Center for Applied Physics and technology Peking UniversityBeijingChina Institute of Applied Physics and Computational Mathematics BeijingChina Institute of Laser Engineering Osaka UniversityOsakaJapan

*** Strong interest in the modeling of planetary interiors,dwarf stars,and the physical conditions necessary to achieve inertial confinement fusion(ICF)have driven attention to the properties of matter at high density,temperature,and pressure(beyond the megabar limit).Extreme states of matter have been studied using gas guns,explosives,and Z-pinches,among other methods(see,e.g.,Refs.1–4).However in recent years,lasers have become the most reliable standard tool for creating extreme states of matter.

关键词： extreme laser states

Burst behavior due to the quasimode excited by stimulated Brillouin scattering in high-intensity laser-plasma interactions

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High Power Laser Science and Engineering 2019年第4期7卷 1-7页

作者： Q.S.Feng L.H.Cao Z.J.Liu C.Y.Zheng x.t.he Institute of Applied Physics and Computational Mathematics Beijing 100094China heDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100871China Collaborative Innovation Center of IFSA(CICIFSA) Shanghai Jiao Tong UniversityShanghai 200240China

the strong-coupling mode,called the"quasimode",is excited by stimulated Brillouin scattering(SBS)in high-intensity laser-plasma *** SBS of the quasimode competes with SBS of the fast mode(or slow mode)in multiion species plasmas,thus leading to a low-frequency burst behavior of SBS *** between the quasimode and the ion-acoustic wave(IAW)is an important saturation mechanism of SBS in high-intensity laser-plasma *** results give a clear explanation of the low-frequency periodic burst behavior of SBS and should be considered as a saturation mechanism of SBS in high-intensity laser-plasma interactions.

关键词： Brillouin amplification inertial confinement fusion ion-acoustic waves quasimode stimulated Brillouin scattering

Competition among the two-plasmon decay of backscattered light,filamentation of the electron-plasma wave and side stimulated Raman scattering

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High Power Laser Science and Engineering 2023年第6期11卷 87-94页

作者： K.Q.Pan Z.C.Li L.Guo t.Gong S.W.Li D.Yang C.Y.Zheng B.H.Zhang x.t.he Laser Fusion Research Center China Academy of Engineering PhysicsMianyangChina Center for Applied Physics and technology Peking UniversityBeijingChina Institute of Applied Physics and Computational Mathematics BeijingChina

Competition among the two-plasmon decay(tPD)of backscattered light of stimulated Raman scattering(SRS),filamentation of the electron-plasma wave(EPW)and forward side SRS is investigated by two-dimensional particlein-cell *** previous work[*** et al.,*** 58,096035(2018)]showed that in a plasma with the density near 1/10 of the critical density,the backscattered light would excite the tPD,which results in suppression of the backward ***,this work further shows that when the laser intensity is so high(>10^(16)W/cm^(2))that the backward SRS cannot be totally suppressed,filamentation of the EPW and forward side SRS will be *** the tPD of the backscattered light only occurs in the early stage and is suppressed in the latter *** distribution functions further show that trapped-particle-modulation instability should be responsible for filamentation of the *** research can promote the understanding of hot-electron generation and SRS saturation in inertial confinement fusion experiments.

关键词： laser plasma instability inertial confinement fusion high energy density physics particle-in-cell simulation super-hot electrons

Proton beams from intense laser-solid interaction:Effects of the target materials

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Matter and Radiation at Extremes 2020年第6期5卷 42-47页

作者： Y.x.Geng D.Wu W.Yu Z.M.Sheng S.Fritzsche Q.Liao M.J.Wu x.H.xu D.Y.Li W.J.Ma H.Y.Lu Y.Y.Zhao x.t.he J.E.Chen C.Lin x.Q.Yan Key Laboratory of heDP of the Ministry of Education CAPTand State Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing 100871China Institute for Fusion theory and Simulation Department of PhysicsZhejiang University310058 HangzhouChina State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics201800 ShanghaiChina SUPA Department of Physics University of StrathclydeGlasgow G40NGUnited Kingdom Key Laboratory for Laser Plasmas(Ministry of Education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China helmholtz Institut-Jena and Friedrich-Schiller-University D-07743 JenaGermany

We report systematic studies of laser-driven proton beams produced with micrometer-thick solid targets made of aluminum and plastic,*** effects of the target materials are found on the total charge,cutoff energy,and beam spot of protons in the experiments,and these are described well by two-dimensional particle-in-cell simulations incorporating intrinsic material *** is found that with a laser intensity of 8×10^(19) W/cm^(2),target normal sheath acceleration is the dominant mechanism for both types of *** a plastic target,the higher charge and cutoff energy of the protons are due to the greater energy coupling efficiencies from the intense laser beams,and the larger divergence angle of the protons is due to the deflection of hot electrons during transport in the *** also find that the energy loss of hot electrons in targets of different thickness has a significant effect on the proton cutoff *** consistent results obtained here further narrow the gap between simulations and experiments.

关键词： properties. intense solid

Enhancement of the surface emission at the fundamental frequency and the transmitted high-order harmonics by pre-structured targets

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High Power Laser Science and Engineering 2019年第2期7卷 111-119页

作者： K.Q.Pan D.Yang L.Guo Z.C.Li S.W.Li C.Y.Zheng S.E.Jiang B.H.Zhang x.t.he Laser Fusion Research Center China Academy cf Engineering PhysicsMianyang 621900.China Center for Applied Physics and technology Peking UniversityBeijing 100871China Institute of Applied Physics and Computational Mathematics Beijing 100088China

Laser interaction with an ultra-thin pre-structured target is investigated with the help of both two-dimensional and threedimensional particle-in-cell *** the existence of aperiodic structure on the target surface,the laser seems to penetrate through the target at its fundamental frequency even if the plasma density of the target is much higher than the laser’s relativistically critical *** particle-in-cell simulations show that the transmitted laser energy behind the pre-structured target is increased by about two orders of magnitude compared to that behind the flat *** analyses show that the transmitted energy behind the pre-structured target is actually re-emitted by electron’islands’ formed by the surface plasma waves on the target *** other words,the radiation with the fundamental frequency is actually’surface emission,on the target rear *** the intensity of the component with the fundamental frequency,the intensity of the high-order harmonics behind the pre-structured target is also much enhanced compared to that behind the flat *** enhancement of the high-order harmonics is also related to the surface plasma waves generated on the target surfaces.

关键词： high-order harmonics generation high power laser laser-plasma interaction particle-in-cell simulation

In situ tEM investigation of electron irradiation and aging-induced high-density nanoprecipitates in an Mg-10Gd-3Y-1Zn-0.5Zr alloy

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Journal of Magnesium and Alloys 2024年第5期12卷 1841-1853页

作者： M.Lv H.L.Ge Q.Q.Jin x.H.Shao Y.t.Zhou B.Zhang x.L.Ma Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China

In-situ electron irradiation and aging are applied to introduce high-density precipitates in an Mg-10Gd-3Y-1Zn-0.5Zr(GWZ1031K,wt.%)alloy to improve the *** results show that the hardness of the Mg alloy after irradiation for 10 h and aging for 9 h at 250℃ is 1.64 GPa,which is approximately 64% higher than that of the samples before being *** is mainly attributed to γ'precipitates on the basal plane after irradiation and the high-density nanoscale β'precipitates on the prismatic plane after aging,which should be closely related to the irradiation-induced homogenous *** latter plays a key role in precipitation *** result paves a way to improve the mechanical properties of metallic materials by tailoring the precipitation through irradiation and aging.

关键词： Mg alloy Electron beam irradiation Hardening Precipitates In-situ tEM

Food poisoning due to money tree seeds: A case report of toxic encephalopathy

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Emergency and Critical Care Medicine 2024年第3期4卷 126-129页

作者： Zhao Y. Quan x. Wang t. Department of Emergency Medicine Hainan Hospital of Chinese PLA General Hospital Sanya Hainan China the Center of heat Stroke Prevention and treatment of Peoples' Liberation Army Sanya Hainan China

Background the money tree is a favored indoor potted plant in China. Its seeds resemble chestnuts in both shape and flavor when cooked, which are generally considered non-toxic and safe for consumption. Case presentation this report presents the first published case of food poisoning due to the ingestion of large amounts of money tree seeds. A 67-year-old man exhibited toxic encephalopathy symptoms and dyspnea after consuming the seeds for approximately 6 months. After empirical mechanical ventilation, therapeutic plasma exchange, and other medical interventions, the patient's clinical status improved significantly. he was subsequently discharged from the hospital. Conclusion Consuming a substantial quantity of money tree seeds within a limited timeframe can lead to poisoning, resulting in adverse outcomes, particularly toxic encephalopathy. Moreover, plasma exchange may have some therapeutic effect. © Wolters Kluwer health, Inc. All rights reserved.

关键词： Case report Money tree Pachira macrocarpa Respiratory failure toxic encephalopathy