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Raman-Brillouin interplay for inertial confinement fusion relevant laser-plasma interaction

High Power Laser science and Engineering 2016年第3期4卷 23-38页

作者： C.Riconda s.weber LULI-UPMC UniversitParis 6:sorbonne Universits CNRSEcole PolytechniqueCEA:Universit Paris-Saclay Institute of Physics of the AsCR

The co-existence of the Raman and Brillouin backscattering instability is an important issue for inertial confinement fusion. The present paper presents extensive one-dimensional(1D) particle-in-cell(PIC) simulations for a wide range of parameters extending and complementing previous findings. PIC simulations show that the scenario of reflectivity evolution and saturation is very sensitive to the temperatures, intensities, size of plasma and boundary conditions employed. The Langmuir decay instability is observed for rather small k_(epw)λ_D but has no influence on the saturation of Brillouin backscattering, although there is a clear correlation of Langmuir decay instability modes and ion-fractional decay for certain parameter ranges. Raman backscattering appears at any intensity and temperature but is only a transient phenomenon. In several configurations forward as well as backward Raman scattering is observed. For the intensities considered, I λ_o^2 above 10^(15) W μm^2/cm^2, Raman is always of bursty nature. A particular setup allows the simulation of multi-speckle aspects in which case it is found that Raman is self-limiting due to strong modifications of the distribution function. Kinetic effects are of prime importance for Raman backscattering at high temperatures. No unique scenario for the saturation of Raman scattering or Raman–Brillouin competition does exist. The main effect in the considered parameter range is pump depletion because of large Brillouin backscattering. However, in the low k_(epw)λ_D regime the presence of ion-acoustic waves due to the Langmuir decay instability from the Raman created electron plasma waves can seed the ion-fractional decay and affect the Brillouin saturation.

关键词： Brillouin backscattering inertial confinement fusion kinetic effects laser-plasma interaction parametric instabilities particle-in-cell simulations Raman backscattering

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Fiduciary Responsibility: Facilitating Public Trust in Automated Decision Making

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Journal of social Computing 2022年第4期3卷 345-362页

作者： shannon B.Harper Eric s.weber Department of sociology and Criminal Justice Iowa State UniversityAmesIA 50011USA. Department of Mathematics Iowa State UniversityAmesIA 50011USA.

Automated decision-making systems are being increasingly deployed and affect the public in a multitude of positive and negative *** and private institutions use these systems to process information according to certain human-devised rules in order to address social problems or organizational *** research and real-world experience indicate that the public lacks trust in automated decision-making systems and the institutions that deploy *** recreancy theorem argues that the public is more likely to trust and support decisions made or influenced by automated decision-making systems if the institutions that administer them meet their fiduciary ***,often the public is never informed of how these systems operate and resultant institutional decisions are made.A“black box”effect of automated decision-making systems reduces the public’s perceptions of integrity and ***,the institutions administering these systems are less able to assess whether the decisions are *** result is that the public loses the capacity to identify,challenge,and rectify unfairness or the costs associated with the loss of public goods or *** current position paper defines and explains the role of fiduciary responsibility within an automated decision-making *** formulate an automated decision-making system as a data science lifecycle(DsL)and examine the implications of fiduciary responsibility within the context of the *** responsibility within DsLs provides a methodology for addressing the public’s lack of trust in automated decision-making systems and the institutions that employ them to make decisions affecting the *** posit that fiduciary responsibility manifests in several contexts of a DsL,each of which requires its own mitigation of sources of *** instantiate fiduciary responsibility,a Los Angeles Police Department(LAPD)predictive policing case study is *** examine the de

关键词： trust artificial intelligence automated decision-making recreancy theorem fiduciary responsibility

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Temperature dependence of parametric instabilities in the context of the shock-ignition approach to inertial confinement fusion

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High Power Laser science and Engineering 2015年第1期3卷 51-63页

作者： s.weber C.Riconda Institute of Physics of the AsCR ELI-Beamlines LULI Sorbonne Universités - Université Pierre et Marie Curie - Ecole Polytechnique - CNRS - CEA

The role of the coronal electron plasma temperature for shock-ignition conditions is analysed with respect to the dominant parametric processes: stimulated Brillouin scattering, stimulated Raman scattering, two-plasmon decay(TPD), Langmuir decay instability(LDI) and cavitation. TPD instability and cavitation are sensitive to the electron temperature. At the same time the reflectivity and high-energy electron production are strongly affected. For low plasma temperatures the LDI plays a dominant role in the TPD saturation. An understanding of laser–plasma interaction in the context of shock ignition is an important issue due to the localization of energy deposition by collective effects and hot electron *** in turn can have consequences for the compression phase and the resulting gain factor of the implosion phase.

关键词： inertial confinement fusion shock ignition laser–plasma interaction parametric instabilities

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Plasma optics:A perspective for high-power coherent light generation and manipulation

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Matter and Radiation at Extremes 2023年第2期8卷 1-5页

作者： C.Riconda s.weber LULI Sorbonne UniversitéCNRSÉcole PolytechniqueCEA75252 ParisFrance Extreme Light Infrastructure ERIC ELI Beamlines Facility25241 Dolni BrezanyCzech Republic

Over the last two decades,the importance of fully ionized plasmas for the controlled manipulation of high-power coherent light has increased *** ideas have been put forward on how to control or change the properties of laser pulses such as their frequency,spectrum,intensity,and *** corresponding interaction with a plasma can take place either in a self-organizing way or by prior *** work has been done in theoretical studies and in simulations,but at present there is a backlog of demand for experimental veri-ﬁcation and the associated detailed characterization of plasma-optical *** proof-of-principle experiments need to be pushed to higher power *** is little doubt that plasmas have huge potential for future use in high-power *** introduction to the special issue of Matter and Radiation at Extremes devoted to plasma optics sets the framework,gives a short historical overview,and brieﬂy describes the various articles in this collection.

关键词： power optics coherent

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Physics of porous materials under extreme laser-generated conditions

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Matter and Radiation at Extremes 2024年第3期9卷 1-3页

作者： V.T.Tikhonchuk s.weber Extreme Light Infrastructure ERIC ELI Beamlines Facility25241 DolníBrezanyCzech Republic CELIA University of Bordeaux33405 TalenceFrance

Porous materials offer unique possibilities for the production of plasmas with controlled density profiles for experiments on laser–matter *** are of growing relevance to many applications,such as inertial confinement fusion,fundamental research,and secondary *** the processes of transformation of a porous solid into a plasma is of fundamental interest and is needed for producing materials with desired properties.

关键词： interaction. properties. porous

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Fast magnetic energy dissipation in relativistic plasma induced by high order laser modes

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High Power Laser science and Engineering 2016年第2期4卷 85-89页

作者： Y.J.Gu Q.Yu O.Klimo T.Zh.Esirkepov s.V.Bulanov s.weber G.Korn Institute of Physics of the AsCR Institute of Modern Physics Fudan University FNsPE Czech Technical University in Prague Kansai Photon science Institute Japan Atomic Energy Agency

Fast magnetic field annihilation in a collisionless plasma is induced by using TEM(1,0) laser pulse. The magnetic quadrupole structure formation, expansion and annihilation stages are demonstrated with 2.5-dimensional particle-in-cell simulations. The magnetic field energy is converted to the electric field and accelerate the particles inside the annihilation plane. A bunch of high energy electrons moving backwards is detected in the current sheet. The strong displacement current is the dominant contribution which induces the longitudinal inductive electric field.

关键词： high order laser mode laser–plasma interaction magnetic annihilation

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Collective coherent emission of electrons in strong laser fields and perspective for hard x-ray lasers

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Matter and Radiation at Extremes 2024年第2期9卷 1-3页

作者： E.G.Gelfer A.M.Fedotov O.Klimo s.weber Extreme Light Infrastructure ERIC ELI Beamlines Facility25241 Dolní BřežanyCzech Republic HiLAsE Centre Institute of Physics of the Czech Academy of Sciences25241 Dolní BřežanyCzech Republic National Research Nuclear University MEPhI Moscow 115409Russia FNsPE Czech Technical University in Prague11519 PragueCzech Republic

Coherent motion of particles in a plasma can imprint itself on *** recent advent of high-power lasers—allowing the nonlinear inverse Compton-scattering regime to be reached—has opened the possibility of looking at collective effects in laser–plasma *** certain conditions,the collective interaction of many electrons with a laser pulse can generate coherent radiation in the hard x-ray *** perspective paper explains the limitations under which such a regime might be attained.

关键词： laser scattering coherent

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studies of laser-plasma interaction physics with low-density targets for direct-drive inertial confinement schemes

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Matter and Radiation at Extremes 2019年第4期4卷 15-22页

作者： V.Tikhonchuk Y.J.Gu O.Klimo J.Limpouch s.weber ELI-Beamlines Institute of PhysicsAcademy of Sciences of the Czech Republic18221 PragueCzech Republic Centre Lasers Intenses et Applications University of Bordeaux–CNRS–CEATalence 33405France Institute of Plasma Physics of the CAs Za Slovankou 1782/318200 PragueCzech Republic FNsPE Czech Technical University in Prague11519 PragueCzech Republic

Comprehensive understanding and possible control of parametric instabilities in the context of inertial confinement fusion (ICF) remains achallenging task. The details of the absorption processes and the detrimental effects of hot electrons on the implosion process require as mucheffort on the experimental side as on the theoretical and simulation side. This paper describes a proposal for experimental studies on nonlinearinteraction of intense laser pulses with a high-temperature plasma under conditions corresponding to direct-drive ICF schemes. We propose todevelop a platform for laser-plasma interaction studies based on foam targets. Parametric instabilities are sensitive to the bulk plasma temperatureand the density scale length. Foam targets are sufficiently flexible to allow control of these parameters. However, investigationsconducted on small laser facilities cannot be extrapolated in a reliable way to real fusion conditions. It is therefore necessary to performexperiments at a multi-kilojoule energy level on medium-scale facilities such asOMEGAor sG-III. An example of two-plasmon decay instabilityexcited in the interaction of two laser beams is considered.

关键词： interaction details excited

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Collective absorption of laser radiation in plasma at sub-relativistic intensities

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High Power Laser science and Engineering 2019年第3期7卷 27-36页

作者： Y.J.Gu O.Klimo Ph.Nicolai s.shekhanov s.weber V.T.Tikhonchuk ELI-Beamlines Institute of PhysicsCzech Academy of Sciences25241 Dolni BrezanyCzech Republic Institute of Plasma Physics of the CAs Za Slovankou 1782/318200 PragueCzech Republic Faculty of Nuclear sciences and Physical Engineering Czech Technical University in Prague11519 PragueCzech Republic Centre of Intense Lasers and Applications University of BordeauxCNRSCEA33405 TalenceFrance school of science Xi'an Jiaotong UniversityXi'an 710049China

Processes of laser energy absorption and electron heating in an expanding plasma in the range of irradiances Iλ^2=1015–1016 W·μm^2/cm^2 are studied with the aid of kinetic *** results show a strong reflection due to stimulated Brillouin scattering and a significant collisionless absorption related to stimulated Raman scattering near and below the quarter critical *** presented are parametric decay instability and resonant excitation of plasma waves near the critical *** these processes result in the excitation of high-amplitude electron plasma waves and electron *** spectrum of scattered radiation is significantly modified by secondary parametric processes,which provide information on the spatial localization of nonlinear absorption and hot electron *** considered domain of laser and plasma parameters is relevant for the shock ignition scheme of inertial confinement fusion.

关键词： inertial confinement fusion parametric instabilities

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The L4n laser beamline of the P3-installation:Towards high-repetition rate high-energy density physics at ELI-Beamlines

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Matter and Radiation at Extremes 2021年第1期6卷 45-53页

作者： N.Jourdain U.Chaulagain M.Havlik D.Kramer D.Kumar V.T.Tikhonchuk G.Korn s.weber ELI-Beamlines Institute of PhysicsCzech Academy of Sciences18221 PragueCzech Republic Centre Lasers Intenses et Applications University of Bordeaux-CNRS-CEA33405 TalenceFrance school of science Xi’an Jiaotong UniversityXi’an 710049China

The P3 installation of ELI-Beamlines is conceived as an experimental platform for multiple high-repetition-rate laser beams spanning time scales from femtosecond via picosecond to *** upcoming L4n laser beamline will provide shaped nanosecond pulses of up to 1.9 kJ at a maximum repetition rate of 1 shot/*** beamline will provide unique possibilities for high-pressure,high-energy-density physics,warm dense matter,and laser–plasma interaction *** to the high repetition rate,it will become possible to obtain considerable improvements in data statistics,in particular,for equation-of-state data *** nanosecond beam will be coupled with short sub-picosecond pulses,providing high-resolution diagnostic tools by either irradiating a backlighter target or driving a betatron setup to generate energetic electrons and hard X-rays.

关键词： laser repetition beam

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