检索结果-南通市图书馆

Precise wavelength measurements of potassium He- and Li-like satellites emitted from the laser plasma of a mineral target

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2021年第1期6卷 15-20页

作者： S.N.Ryazantsev I.Yu.Skobelev E.D.Filippov A.S.Martynenko M.D.Mishchenko M.Krus o.renner S.A.Pikuz National Research Nuclear University MEPhI(Moscow Engineering Physics Institute) Kashirskoe Shosse 31115409 MoscowRussia Joint Institute for High Temperatures of the Russian Academy of Sciences Izhorskaya 13 Bldg 2125412 MoscowRussia Federal Research Center Institute of Applied Physics of the Russian Academy of Sciences 46 Ulyanov Str.603950 Nizhny NovgorodRussia Laser Plasma Department Institute of Plasma Physics of the CASZa Slovankou 1782/3Libeˇn18200 PragueCzech Republic Department of Radiation and Chemical Physics Institute of Physics of the CASNa Slovance 1999/218221 PragueCzech Republic ELI-Beamlines Institute of Physics of the CASZa Radnici83525241 Dolni BiezanyCzech Republic

Atomic models of high-Zmulticharged ions are extremely complex and require experimental validation.oneway to do so is to crosscheck the predicted wavelengths of resonance transitions in He-and Li-like ions against precise spectroscopic measurements that use the spectral lines of H-like ions for spectra calibration;these reference data can be modeled with outstanding precision.However,for elements with Z of at least 15,it is quite difficult to create a hot dense plasma with a large concentration ofH-like charge states.To mitigate this issue,the suggestion here is to use as laser targets particular minerals comprising elements with moderate(between 15 and 30)and low(less than 15)Z,with emission from the latter delivering perfect reference lines over a whole range o fHe-and Li-like moderate-Z emission under examination.This approach is implemented to measure the wavelengths of resonance transitions(1snp→1s^(2) for n=2,3)in He-likeKions and their dielectronic satellites by irradiating plates of orthoclase(KAlSi_(3)o_(8))with0.5-kJ subnanosecond laser pulses.X-ray spectra of the laser-generated plasma contain the investigated lines of highly charged K-ions together with precisely known reference lines of H-like Al and Si atoms.The K-shell spectral line wavelengths are measured with a precision of around 0.3 mA.

关键词： laser potassium transitions

Characterization of hot electrons generated by laser-plasma interaction at shock ignition intensities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2023年第6期8卷 74-89页

作者： 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 Joint Institute for High Temperatures RAS Moscow 125412Russia York Plasma Institute School of PhysicsEngineering and TechnologyUniversity of YorkYork YO105DDUnited Kingdom Universitéde Bordeaux CNRSCEACELIATalence 33405France Institute of Plasma Physics of the CAS PragueCzech Republic Plasma Physics Department GSI Helmholtzzentrum für Schwerionenforschung64291 DarmstadtGermany Institute of Physics of the CAS PragueCzech Republic Intense Laser Irradiation Laboratory INO-CNRPisa 56124Italy Centro de Laseres Pulsados(CLPU) Edicio M5Parque Científico.C Adaja8Salamanca 37185Spain Institute of Plasma Physics and Lasers-IPPL Centre of Research and InnovationHellenic Mediterranean UniversityRethymnonGreece Department of Electronic Engineering Hellenic Mediterranean UniversityChaniaGreece National Research Nuclear University MEPhI Moscow 115409Russia University of Alberta Edmonton T6G 2V4AlbertaCanada The Extreme Light Infrastructure ERIC ELI Beamlines FacilityDolníBˇrezanyCzech Republic

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.

关键词： spectroscopy shock allowed

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

维普期刊数据库

A review of current understanding in tribochemical reactions involving lubricant additives

在线全文

学校读者我要写书评

暂无评论

Friction 2023年第4期11卷 489-512页

作者： Yan CHEN Peter renner Hong LIANG Department of Materials Science and Engineering Texas A&M UniversityCollege Station 77843USA J.Mike Walker’66 Department of Mechanical Engineering Texas A&M UniversityCollege Station 77843USA

Lubricants have played important roles in friction and wear reduction and increasing efficiency of mechanical systems.To optimize tribological performance,chemical reactions between a lubricant and a substrate must be designed strategically.Tribochemical reactions are chemical reactions enabled or accelerated by mechanical stimuli.Tribochemically activated lubricant additives play important roles in these reactions.In this review,current understanding in mechanisms of chemical reactions under shear has been discussed.Additives such as oil-soluble organics,ionic liquids(ILs),and nanoparticles(NPs)were analyzed in relation to the tribochemical reaction routes with elements in metallic substrates.The results indicated that phosphorus,sulfur,fluorine,and nitrogen are key elements for tribochemical reactions.The resulting tribofilms from zinc dithiophosphates(ZDDP)and molybdenum dithiocarbamate(MoDTC)have been widely reported,yet that from ILs and NPs need to investigate further.This review serves as a reference for researchers to design and optimize new lubricants.

关键词： lubricant additives tribochemical reactions oil-soluble organics ionic liquids(ILs) nanoparticles(NPs)

Design,installation and commissioning of the ELI-Beamlines high-power,high-repetition rate HAPLS laser beam transport system to P3

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2021年第2期9卷 215-240页

作者： S.Borneis T.Laštovickaˇ M.Sokol T.-M.Jeong F.Condamine o.renner V.Tikhonchuk H.Bohlin A.Fajstavr J.-C.Hernandez N.Jourdain D.Kumar D.Modranskýˇ A.Pokorný A.Wolf S.Zhai G.Korn S.Weber eli-beamlines center institute of physicsczech academy of sciencesdolníbˇrežanyczech republic gsi helmholtzzentrum für schwerionenforschung gmbh darmstadtgermany centre lasers intenses et applications university of bordeaux-cnrs-ceatalencefrance school of science xi’an jiaotong universityxi’anchina

The design and the early commissioning of the ELI-Beamlines laser facility’s 30 J,30 fs,10 Hz HAPLS(High-repetitionrate Advanced Petawatt Laser System)beam transport(BT)system to the P3 target chamber are described in detail.It is the world’s first and with 54 m length,the longest distance high average power petawatt(PW)BT system ever built.It connects the HAPLS pulse compressor via the injector periscope with the 4.5 m diameter P3 target chamber of the plasma physics group in hall E3.It is the largest target chamber of the facility and was connected first to the BT system.The major engineering challenges are the required high vibration stability mirror support structures,the high pointing stability optomechanics as well as the required levels for chemical and particle cleanliness of the vacuum vessels to preserve the high laser damage threshold of the dielectrically coated high-power mirrors.A first commissioning experiment at low pulse energy shows the full functionality of the BT system to P3 and the novel experimental infrastructure.

关键词： beam transport system cleanliness high-power laser laser commissioning laser-plasma experiment optomechanics stability X-ray user facility

维普期刊数据库

Studies of laser-plasma interaction physics with low-density targets for direct-drive inertial confinement fusion on the Shenguang III prototype

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2021年第2期6卷 54-66页

作者： V.T.Tikhonchuk T.Gong N.Jourdain o.renner F.P.Condamine K.Q.Pan W.Nazarov L.Hudec J.Limpouch R.Liska M.Krus F.Wang D.Yang S.W.Li Z.C.Li Z.Y.Guan Y.G.Liu T.Xu X.S.Peng X.M.Liu Y.L.Li J.Li T.M.Song J.M.Yang S.E.Jiang B.H.Zhang W.Y.Huo G.Ren Y.H.Chen W.Zheng Y.K.Ding K.Lan S.Weber ELI-Beamlines Institute of PhysicsCzech Academy of Sciences25241 Dolni BrezanyCzech Republic Centre Lasers Intenses et Applications University of Bordeaux-CNRS-CEA33405 TalenceFrance Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China Institute of Plasma Physics Czech Academy of Sciences18200 PragueCzech Republic Independent Foam Target Supplier CarnoustieDD76DPUnited Kingdom Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in Prague11519 PragueCzech Republic Institute of Applied Physics and Computational Mathematics Beijing 100088China Center for Applied Physics and Technology Peking UniversityBeijing 100871China School of Science Xi’an Jiaotong UniversityXi’an 710049China

The physics of laser-plasma interaction is studied on the Shenguang III prototype laser facility under conditions relevant to inertial confinement fusion designs.A sub-millimeter-size underdense hot plasma is created by ionization of a low-density plastic foam by four high-energy(3.2 kJ)laser beams.An interaction beam is fired with a delay permitting evaluation of the excitation of parametric instabilities at different stages of plasma evolution.Multiple diagnostics are used for plasma characterization,scattered radiation,and accelerated electrons.The experimental results are analyzed with radiation hydrodynamic simulations that take account of foam ionization and homogenization.The measured level of stimulated Raman scattering is almost one order of magnitude larger than that measured in experiments with gasbags and hohlraums on the same installation,possibly because of a greater plasma density.Notable amplification is achieved in high-intensity speckles,indicating the importance of implementing laser temporal smoothing techniques with a large bandwidth for controlling laser propagation and absorption.

关键词： density. interaction scattered

Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2019年第3期7卷 142-155页

作者： G.Cristoforetti L.Antonelli D.Mancelli S.Atzeni F.Baffigi F.Barbato D.Batani G.Boutoux F.D'Amato J.Dostal R.Dudzak E.Filippov Y.J.Gu L.Juha o.Klimo M.Krus S.Malko A.S.Martynenko Ph.Nicolai V.ospina S.Pikuz o.renner J.Santos V.T.Tikhonchuk J.Trela S.Viciani L.Volpe S.Weber L.A.Gizzi National Institute of optics CNRPisa and FlorenceItaly York Plasma Physics Institute University of YorkHe slingtonYorkUK Universite de Bordeaux CNRSCEACELIATalenceFrance Donostia International Physics Center(DiPC) Donostia/San SebastianBasque CountrySpain Dipartimento SBAI Universita di Roma La SapienzaRomaItaly National Research Nuclear University MEPhl MoscowRussia CEA DAMDIFArpajonFrance Department of Radiation and Chemical Physics Institute of Physics of the CASPragueCzech Republic Laser Plasma Department Institute of Plasma Physics of the CASPragueCzech Republic Joint Institute for High Temperature RAS MoscowRussia ELI-Beamlines Institute of Physics of the CASPragueCzech Republic FNSPE Czech Technical University in PraguePragueCzech Republic Universidad de Salamanca Ctr Laseres PulsadosSalamancaSpain Centro de Laseres Pulsados(CLPU) VillamayorSalamancaSpain

Laser–plasma interaction(LPI)at intensities 1015–1016 W·cm^-2 is dominated by parametric instabilities which can be responsible for a significant amount of non-collisional absorption and generate large fluxes of high-energy nonthermal electrons.Such a regime is of paramount importance for inertial confinement fusion(ICF)and in particular for the shock ignition scheme.In this paper we report on an experiment carried out at the Prague Asterix Laser System(PALS)facility to investigate the extent and time history of stimulated Raman scattering(SRS)and two-plasmon decay(TPD)instabilities,driven by the interaction of an infrared laser pulse at an intensity^1.2×1016 W·cm^-2 with a^100μm scalelength plasma produced from irradiation of a flat plastic target.The laser pulse duration(300 ps)and the high value of plasma temperature(~4 ke V)expected from hydrodynamic simulations make these results interesting for a deeper understanding of LPI in shock ignition conditions.Experimental results show that absolute TPD/SRS,driven at a quarter of the critical density,and convective SRS,driven at lower plasma densities,are well separated in time,with absolute instabilities driven at early times of interaction and convective backward SRS emerging at the laser peak and persisting all over the tail of the pulse.Side-scattering SRS,driven at low plasma densities,is also clearly observed.Experimental results are compared to fully kinetic large-scale,two-dimensional simulations.Particle-in-cell results,beyond reproducing the framework delineated by the experimental measurements,reveal the importance of filamentation instability in ruling the onset of SRS and stimulated Brillouin scattering instabilities and confirm the crucial role of collisionless absorption in the LPI energy balance.

关键词： plasma simulations shock ignition stimulated Raman scattering two-plasmon decay

维普期刊数据库

New calculations indicate that 90% of flowering plant species are animal-pollinated

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第10期10卷 17-19页

作者： Ze-Yu Tong Ling-Yun Wu Hui-Hui Feng Meng Zhang W.Scott Armbruster Susanne S.renner Shuang-Quan Huang Institute of Evolution and Ecology School of Life Sciences Central China Normal University Faculty of Resources and Environmental Science Hubei University School of Biological Sciences University of Portsmouth Institute of Arctic Biology University of Alaska Fairbanks Department of Biology Washington University

The services of animal pollinators that deliver compatible pollen to receptive stigmas are essential for the reproduction of many flowering plants [1,2].The maintenance of plant-pollinator interactions,therefore,is the basis for the function and sustainability of healthy ecosystems.For this reason, there has been widespread concern over the past two decades about the global decline in pollinators and the effects of this loss on pollination services for both wild plants and crops [3,4].

关键词：

Virus-Induced Gene Silencing in the Culinary Ginger （Zingiber officinale）： An Effective Mechanism for Down-Regulating Gene Expression in Tropical Monocots

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2009年第5期2卷 1084-1094页

作者： Tanya renner Jennifer Bragg Heather E. Driscoll Juliana Cho Andrew o. Jackson Chelsea D. Specht Department of Plant and Microbial Biology University of California Berkeley CA 94720 USA Present address: Genornics and Gene Discovery USDA ARS PWA WRRC-GGD 800 Buchanan Street Albany CA 94710 USA

Virus-induced gene silencing （VIGS） has been shown to be effective for transient knockdown of gene expression in plants to analyze the effects of specific genes in development and stress-related responses. VlGS is well established for studies of model systems and crops within the Solanaceae, Brassicaceae, Leguminaceae, and Poaceae, but only recently has been applied to plants residing outside these families. Here, we have demonstrated that barley stripe mosaic virus （BSMV） can infect two species within the Zingiberaceae, and that BSMV-VIGS can be applied to specifically down-regulate phytoene desaturase in the culinary ginger Zingiber officinale. These results suggest that extension of BSMV-VlGS to monocots other than cereals has the potential for directed genetic analyses of many important temperate and tropical crop species.

关键词： Barley stripe mosaic virus virus-induced gene silencing VIGS Zingiber officinale Monocot.