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Metrology for sub-Rayleigh-length target positioning in~10^(22)W/cm^(2)laser-plasma experiments

High power Laser science and Engineering 2024年第3期12卷 90-105页

作者： E.A.vishnyakov A.sagisaka K.Ogura T.Zh.Esirkepov B.Gonzalez-Izquierdo C.D.Armstrong T.A.pikuz s.A.pikuz W.Yan T.M.Jeong s.singh p.Hadjisolomou O.Finke G.M.Grittani M.Nevrkla C.M.Lazzarini A.velyhan T.Hayakawa Y.Fukuda J.K.Koga M.Ishino K.Kondo Y.Miyasaka A.Kon M.Nishikino Y.v.Nosach D.Khikhlukha I.p.Tsygvintsev D.Kumar J.Nejdl D.Margarone p.v.sasorov.s.weber M.Kando H.Kiriyama Y.Kato G.Korn K.Kondo s.v.Bulanov T.Kawachi A.s.pirozhkov ELI Beamlines Facility The Extreme Light Infrastructure ERICDolníBrežanyCzech Republic Kansai Institute for photon science(KpsI) QSTKyotoJapan Central Laser Facility Rutherford Appleton LaboratorySTFCHarwell OxfordDidcotUK Institute for Open and Transdisciplinary Research Initiatives Osaka UniversityOsakaJapan HB11 Energy Holdings FreshwaterAustralia Key Laboratory for Laser plasmas(Ministry of Education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina Collaborative Innovation Center of IFsA Shanghai Jiao Tong UniversityShanghaiChina Institute of plasma physics AsCR PragueCzech Republic FZU-Institute of physics AsCR PragueCzech Republic Czech Technical University in prague FNSPEPragueCzech Republic Institute of Laser Engineering Osaka UniversityOsakaJapan Institute of physics National Academy of Sciences of UkraineKyivUkraine IsTEQ AR YerevanArmenia

Tight focusing with very small f-numbers is necessary to achieve the highest at-focus ***,tight focusing imposes strong demands on precise target positioning in-focus to achieve the highest on-target irradiance We describe several near-infrared,visible,ultraviolet and soft and hard X-ray diagnostics employed in a~10^(22)W/cm^(2)laser±plasma *** used nearly 10 J total energy femtosecond laser pulses focused into an approximately1.3-μm focal spot on 5±20μm thick stainless-steel *** discuss the applicability of these diagnostics to determine the best in-focus target position with approximately 5μm accuracy(i.e.,around half of the short Rayleigh length)and show that several diagnostics(in particular,3ωreflection and on-axis hard X-rays)can ensure this *** demonstrated target positioning within several micrometers from the focus,ensuring over 80%of the ideal peak laser intensity *** approach is relatively fast(it requires 10±20 laser shots)and does not rely on the coincidence of low-power and high-power focal planes.

关键词： laser-plasma interaction precise target positioning spectroscopy ultra-high intensity X-rays

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Investigation of Al plasmas from thin foils irradiated by high-intensity extreme ultraviolet

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Matter and Radiation at Extremes 2017年第3期2卷 129-138页

作者： E.v.Grabovski p.v.sasorov A.p.shevelko v.v.Aleksandrov s.N.Andreev M.M.Basko A.v.Branitski A.N.Gritsuk G.s.volkov Ya.N.Laukhin K.N.Mitrofanov G.M.Oleinik A.A.samokhin v.p.smirnov I.Yu.Tolstikhina I.N.Frolov O.F.Yakushev state Research Center of the Russian Federation Troitsk Institute for Innovation and Fusion Research 108840TroitskMoscowRussia Keldysh Institute of Applied Mathematics of the Russian Academy of sciences Miusskaya pl.4125047MoscowRussia p.N.Lebedev physical Institute of the Russian Academy of sciences Leninsky pr.53Moscow119991Russia

Dynamics and spectral transmission of Al plasma produced by extreme ultraviolet(EUv)irradiation of 0.75-mm thick Al foil is *** EUv radiation with the peak power density in the range of 0.19-0.54 TW/cm 2 is provided by Z-pinch formed by W multiwire array implosion in the Angara-5-1 *** of the experiment ensures that there are no plasma fluxes from the pinch toward the Al foil and *** same EUv source is used as a back illuminator for obtaining the absorption spectrum of Al plasma in the wavelength range of 5e24 *** comprises absorption lines of ions Al^(4+),Al^(5+),Al^(6+),Al^(7+).Analysis of relative intensities of the lines shows that those ions are formed in dense Al plasma with a temperature of~20 *** of Al plasma has been investigated with transverse laser *** have also performed radiation-gas-dynamics simulations of plasma dynamics affected by external radiation,which includes self-consistent radiation transport in a plasma *** simulations show good agreement with an experimental absorption spectrum and with experimental data concerning plasma dynamics,as well as with the analysis of line absorption *** confirms the correctness of the physical model underlying these simulations.

关键词： Z-pinch Dense plasma transparency

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Radial density profile and stability of capillary discharge plasma waveguides of lengths up to 40 cm

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High power Laser science and Engineering 2021年第2期9卷 31-40页

作者： M.Turner A.J.Gonsalves s.s.Bulanov C.Benedetti N.A.Bobrova v.A.Gasilov p.v.sasorov G.Korn K.Nakamura J.van Tilborg C.G.Geddes C.B.schroeder E.Esarey Lawrence Berkeley National Laboratory BerkeleyCAUSA Keldysh Institute of Applied Mathematics RAs MoscowRussia ELI Beamlines DolníBˇrežanyCzech Republic

We measured the parameter reproducibility and radial electron density profile of capillary discharge waveguides with diameters of 650µm to 2 mm and lengths of 9 to 40 *** the best of the authors’knowledge,40 cm is the longest discharge capillary plasma waveguide to *** length is important for≥10 Gev electron energy gain in a single laser-driven plasma wakefield acceleration *** of waveguide parameter variations showed that their focusing strength was stable and reproducible toverage on-axis plasma electron density tose variations explain only a small fraction of laser-driven plasma wakefield acceleration electron bunch variations observed in experiments to *** of laser pulse centroid oscillations revealed that the radial channel profile rises faster than parabolic and is in excellent agreement with magnetohydrodynamic simulation *** show that the effects of non-parabolic contributions on Gaussian pulse propagation were negligible when the pulse was approximately matched to the ***,they affected pulse propagation for a non-matched configuration in which the waveguide was used as a plasma telescope to change the focused laser pulse spot size.

关键词： capillary plasma waveguide laser-driven plasma wakefield acceleration plasma telescope matched laser guiding

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