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Compact laser wakefield acceleration toward high energy with micro-plasma parabola

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matter and Radiation at Extremes 2024年第6期9卷 53-60页

作者： Xuesong Geng Tongjun Xu Lingang Zhang Igor Kostyukov Alexander pukhov Baifei Shen Liangliang Ji State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-Intense Laser Science Shanghai Institute of Optics and Fine Mechanics(SIOM)Chinese Academy of Sciences(CAS)Shanghai 201800China Institute for Applied Physics of Russian Academy of Sciences 603155 Nizhni NovgorodRussia Institut für Theoretische Physik Ⅰ Universität DüsseldorfDüsseldorf 40225Germany Shanghai Normal University Shanghai 200234China

Laser wakefield acceleration(LWFA)promises compact accelerators toward the high-energy ***,the approach to the 100 GeV milestone faces the obstacle of the long focal length required for optimal acceleration with high-power lasers,which reaches hundreds of meters for 10-100 PW *** long focal length originates from optimal laser intensity required to avoid nonlinear effects and hence large spot size and Rayleigh *** propose a"telescope"geometry in which a micro-plasma parabola(mPP)is coupled with a short-focal-length off-axis parabola,minimizing the focal length to the meter range for LWFA under optimized conditions driven by lasers beyond 1 ***-dimensional kinetic simulations demonstrate the generation of a 9 GeV electron bunch within only 1 m optical length—only one-tenth of that required with the conventional approach with the same *** proposed mPP provides a basis for the construction of compact LWFAs toward single-stage 100 GeV acceleration with 100 PW class lasers.

关键词： laser acceleration high

Bright betatron radiation from direct-laseraccelerated electrons at moderate relativistic laser intensity

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matter and Radiation at Extremes 2021年第4期6卷 10-17页

作者： O.N.Rosmej X.F.Shen A.pukhov L.Antonelli F.Barbato m.Gyrdymov m.m.Gunther S.Zahter V.S.Popov N.G.Borisenko N.E.Andreev GSI Helmholtzzentrum fur Schwerionenforschung GmbH Planckstraße164291 DarmstadtGermany Goethe University FrankfurtMax-von-Laue-Straße 160438 Frankfurt am MainGermany Helmholtz Forschungsakademie Hessen fur FAIR(HFHF) Campus Frankfurt am MainMax-von-Laue-Straße 1260438 Frankfurt am MainGermany Heinrich-Heine-University Dusseldorf Universitatsstraße 1DusseldorfGermany York Plasma Institute University of YorkChurch LaneHeslingtonYork YO105DQUnited Kingdom University of Bordeaux CNRSCEACELIAUMR 5107F-33405 TalenceFrance Joint Institute for High Temperatures RASIzhorskaya St.13Bldg.2125412 MoscowRussia moscow Institute of Physics and Technology(State University) Institutskiy Pereulok 9141700 DolgoprudnyMoscow RegionRussia P.N.Lebedev Physical Institute RASLeninsky Prospekt 53119991 MoscowRussia

Direct laser acceleration(DLA)of electrons in a plasma of near-critical electron density(NCD)and the associated synchrotron-like radiation are discussed for moderate relativistic laser intensity(normalized laser amplitude a0≤4.3)and ps length *** regime is typical of kJ PW-class laser facilities designed for high-energy-density(HED)*** experiments at the PHELIX facility,it has been demonstrated that interaction of a 1019 W/cm2 sub-ps laser pulse with a sub-mm length NCD plasma results in the generation of high-current well-directed superponderomotive electrons with an effective temperature ten times higher than the ponderomotive potential[Rosmej et al.,Plasma *** Fusion 62,115024(2020)].Three-dimensional particle-in-cell simulations provide good agreement with the measured electron energy distribution and are used in the current work to study synchrotron radiation from the DLA-accelerated *** resulting x-ray spectrum with a critical energy of 5 keV reveals an ultrahigh photon number of 731011 in the 1–30 keV photon energy range at the focused laser energy of 20 *** simulations of betatron x-ray phase contrast imaging based on the DLA process for the parameters of a PHELIX laser are *** results are of interest for applications in HED experiments,which require a ps x-ray pulse and a high photon flux.

关键词： intensity relativistic critical

Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical density

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matter and Radiation at Extremes 2024年第2期9卷 26-35页

作者： J.Cikhardt m.Gyrdymov S.Zähter P.Tavana m.m.Günther N.Bukharskii N.Borisenko J.Jacoby X.F.Shen A.pukhov N.E.Andreev O.N.Rosmej Faculty of Electrical Engineering Czech Technical University in Prague16627 Prague 6Czech Republic Goethe University FrankfurtMax-von-Laue-Straße 160438 Frankfurt am MainGermany GSI Helmholtzzentrum für Schwerionenforschung GmbH Planckstraße 164291 DarmstadtGermany Focused Energy GmbH Im Tiefen See 4564293 DarmstadtGermany National Research Nuclear University mEPhI Kashirskoe shosse 31115409 MoscowRussian Federation Lebedev Physical Institute RAS Leninskiy Prospekt 53119991 MoscowRussian Federation Heinrich-Heine-University Düsseldorf Universitätsstrasse 1DüsseldorfGermany Joint Institute for High Temperatures RASIzhorskaya st.13Bldg.2125412 MoscowRussian Federation moscow Institute of Physics and Technology Institutskiy Pereulok 9141700 DolgoprudnyRussia

Directed x-rays produced in the interaction of sub-picosecond laser pulses of moderate relativistic intensity with plasma of near-critical density are investigated. Synchrotron-like (betatron) radiation occurs in the process of direct laser acceleration (DLA) of electrons in a relativisticlaser channel when the electrons undergo transverse betatron oscillations in self-generated quasi-static electric and magnetic fields. In anexperiment at the PHELIX laser system, high-current directed beams of DLA electrons with a mean energy ten times higher than the ponderomotive potential and maximum energy up to 100 meV were measured at 10^(19) W/cm^(2)laser intensity. The spectrum of directed x-raysin the range of 5–60 keV was evaluated using two sets of Ross filters placed at 0°and 10°to the laser pulse propagation axis. The differential x-ray absorption method allowed for absolute measurements of the angular-dependent photon fluence. We report 10^(13) photons/sr withenergies >5 keV measured at 0°to the laser axis and a brilliance of 10^(21) photons s^(−1) mm^(−2) mrad−2(0.1%BW)−1. The angular distributionof the emission has an FWHm of 14°–16°. Thanks to the ultra-high photon fluence, point-like radiation source, and ultra-short emissiontime, DLA-based keV backlighters are promising for various applications in high-energy-density research with kilojoule petawatt-class laserfacilities.

关键词： laser acceleration critical

Nonlinear branched flow of intense laser light in randomly uneven media

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matter and Radiation at Extremes 2023年第2期8卷 25-32页

作者： K.Jiang T.W.Huang C.N.Wu m.Y.Yu H.Zhang S.Z.Wu H.B.Zhuo A.pukhov C.T.Zhou S.C.Ruan College of Applied Sciences Shenzhen UniversityShenzhen 518060People’s Republic of China Shenzhen Key Laboratory of Ultraintense Laser and Advanced material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118People’s Republic of China Institut für Theoretische Physik I Heinrich-Heine-Universität Düsseldorf40225 DüsseldorfGermany

Branched flow is an interesting phenomenon that can occur in diverse *** is usually linear in the sense that the flow does not alter the properties of the *** flow of light on thin films has recently been *** is therefore of interest to know whether nonlinear light branching can also ***,using particle-in-cell simulations,we find that in the case of an intense laser propagating through a randomly uneven medium,cascading local photoionization by the incident laser,together with the response of freed electrons in the strong laser fields,triggers space–time-dependent optical *** resulting branching pattern depends dramatically on the laser *** is,the branching here is distinct from the existing linear *** observed branching properties agree well with theoretical analyses based on the Helmholtz *** branched propagation of intense lasers potentially opens up a new area for laser–matter interaction and may be relevant to other branching phenomena of a nonlinear nature.

关键词： laser intense flow

Betatron-like resonance in ultra-intense laser mass-limited foil interaction

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Betatron-like resonance in ultra-intense laser mass-limited ...