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| 1 | Observation and modelling of stimulated Raman scattering driven by an optically smoothed laser beam in experimental conditions relevant for shock ignition显示文摘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. | 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 | 2021 | High Power Laser Science and Engineering2021，9，4： | 1 |
| 2 | Effects of target pre-heating and expansion on terahertz radiation production from intense laser-solid interactions显示文摘The first experimental measurements of intense(~7 × 1019 W cm-2) laser-driven terahertz(THz) radiation from a solid target which is preheated by an intense pulse of laser-accelerated protons is reported. The total energy of the THz radiation is found to decrease by approximately a factor of 2 compared to a cold target reference. This is attributed to an increase in the scale length of the preformed plasma, driven by proton heating, at the front surface of the target,where the THz radiation is generated. The results show the importance of controlling the preplasma scale length for THz production. | X.H.Yuan Y.Fang D.C.Carroll D.A.MacLellan F.Du N.Booth M.Burza M.Chen R.J.Gray Y.F.Jin Y.T.Li Y.Liu D.Neely H.Powell G.Scott C.-G.Wahlstrm J.Zhang P.McKenna Z.M.Sheng | 2014 | High Power Laser Science and Engineering2014，2，1： | 0 |
| 3 | Optimization of a laser plasma-based x-ray source according to WDM absorption spectroscopy requirements显示文摘X-ray absorption spectroscopy is a well-accepted diagnostic for experimental studies of warm dense matter.It requires a short-lived X-ray source of sufficiently high emissivity and without characteristic lines in the spectral range of interest.In the present work,we discuss how to choose an optimum material and thickness to get a bright source in the wavelength range 2A–6A(∼2 keV to 6 keV)by considering relatively low-Z elements.We demonstrate that the highest emissivity of solid aluminum and silicon foil targets irradiated with a 1-ps high-contrast sub-kJ laser pulse is achieved when the target thickness is close to 10μm.An outer plastic layer can increase the emissivity even further. | A.S.Martynenko S.A.Pikuz I.Yu.Skobelev S.N.Ryazantsev C.D.Baird N.Booth L.N.K.Dohl P.Durey A.Ya.Faenov D.Farley R.Kodama K.Lancaster P.McKenna C.D.Murphy C.Spindloe T.A.Pikuz N.Woolsey | 2021 | Matter and Radiation at Extremes2021，6，1： | 0 |
| 4 | 高压电力变压器的在线,早期报警,远方局部放电监视器显示文摘简介
局部放电是变压器内部绝缘击穿的有效预兆,如若能够在变电站的众多噪音中被可靠检测出来,可用来进行早期报警.新型在线连续监测系统通过采用对局部放电所产生的无线电频率和超声波信号的统计采样进行局部放电检测.随着信号达到四级水平,将在变电站本地报警,并通过调制解调器通讯进行远程报警.此监测系统已经在澳大利亚的新变压器上安装和在旧变压器上进行了翻新改进.早期报警节约了维护大修费用,延长了高压电力变压器的寿命,提高了安全性,避免了环境污染. | J.Unsworth N.Booth | 2001 | 供用电2001，18，1： | 0 |
| 5 | Proton deflectometry of a capacitor coil target along two axes显示文摘A developing application of laser-driven currents is the generation of magnetic fields of picosecond-nanosecond duration with magnitudes exceeding B=10 T.Single-loop and helical coil targets can direct laser-driven discharge currents along wires to generate spatially uniform,quasi-static magnetic fields on the millimetre scale.Here,we present proton deflectometry across two axes of a single-loop coil ranging from 1 to 2 mm in diameter.Comparison with proton tracking simulations shows that measured magnetic fields are the result of kiloampere currents in the coil and electric charges distributed around the coil target.Using this dual-axis platform for proton deflectometry,robust measurements can be made of the evolution of magnetic fields in a capacitor coil target. | P.Bradford M.P.Read M.Ehret L.Antonelli M.Khan N.Booth K.Glize D.Carroll R.J.Clarke R.Heathcote S.Ryazantsev S.Pikuz C.Spindloe J.D.Moody B.B.Pollock V.T.Tikhonchuk C.P.Ridgers J.J.Santos N.C.Woolsey | 2020 | High Power Laser Science and Engineering2020，8，2： | 0 |
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