|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Time-of-flight methodologies with large-area diamond detectors for ion characterization in laser-driven experiments显示文摘The time-of-flight technique coupled with semiconductor detectors is a powerful instrument to provide real-time characterization of ions accelerated because of laser-matter interactions.Nevertheless,the presence of strong electromagnetic pulses(EMPs)generated during the interactions can severely hinder its employment.For this reason,the diagnostic system must be designed to have high EMP shielding.Here we present a new advanced prototype of detector,developed at ENEA-Centro Ricerche Frascati(Italy),with a large-area(15 mm×15 mm)polycrystalline diamond sensor having 150 μm thickness.The tailored detector design and testing ensure high sensitivity and,thanks to the fast temporal response,high-energy resolution of the reconstructed ion spectrum.The detector was offline calibrated and then successfully tested during an experimental campaign carried out at the PHELIX laser facility(E_(L)~100 J,τ_(L)=750 fs,I_(L)(1-2.5)×10^(19)W/cm^(2))at GSI(Germany).The high rejection to EMP fields was demonstrated and suitable calibrated spectra of the accelerated protons were obtained. | M.Salvadori G.Di Giorgio M.Cipriani M.Sciscio C.Verona P.L.Andreoli G.Cristofari R.De Angelis M.Pillon N.E.Andreev P.Antici N.G.Borisenko D.Giulietti M.Migliorati O.Rosmej S.Zahter F.Consoli | 2022 | High Power Laser Science and Engineering2022，10，1： | 1 |
| 2 | Characterization of bright betatron radiation generated by direct laser acceleration of electrons in plasma of near critical density显示文摘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. | J.Cikhardt M.Gyrdymov S.Zähter P.TavanaM.M.Günther N.Bukharskii N.Borisenko J.Jacoby X.F.Shen A.Pukhov N.E.Andreev O.N.Rosmej | 2024 | Matter and Radiation at Extremes2024，9，2： | 0 |
| 3 | Collimated quasi-monochromatic beams of accelerated electrons in the interaction of a weak-contrast intense femtosecond laser pulse with a metal foil显示文摘We demonstrated experimentally the formation of monoenergetic beams of accelerated electrons by focusing femtosecond laser radiation with an intensity of 2×1017W/cm2onto the edge of an aluminum foil.The electrons had energy distributions peaking in the 0.2–0.8 MeV range with energy spread less than 20%.The acceleration mechanism related to the generation of a plasma wave as a result of self-modulation instability of a laser pulse in a dense plasma formed by a prepulse(arriving 12 ns before the main pulse)is considered.One-dimensional and two-dimensional Particle in Cell(PIC)simulations of the laser–plasma interaction showed that effective excitation of a plasma wave as well as trapping and acceleration of an electron beam with an energy on the order of 1 MeV may occur in the presence of sharp gradients in plasma density and in the temporal shape of the pulse. | Yu.A.Malkov A.N.Stepanov D.A.Yashunin L.P.Pugachev P.R.Levashov N.E.Andreev K.Yu.Platonov A.A.Andreev | 2013 | High Power Laser Science and Engineering2013，1，2： | 0 |
| 4 | Bright betatron radiation from direct-laseraccelerated electrons at moderate relativistic laser intensity显示文摘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 pulse.This regime is typical of kJ PW-class laser facilities designed for high-energy-density(HED)research.In 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 Phys.Controlled 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 electrons.The 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 J.Numerical simulations of betatron x-ray phase contrast imaging based on the DLA process for the parameters of a PHELIX laser are presented.The results are of interest for applications in HED experiments,which require a ps x-ray pulse and a high photon flux. | 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 | 2021 | Matter and Radiation at Extremes2021，6，4： | 0 |
| 5 | Transient electromagnetic fields generated in experiments at the PHELIX laser facility显示文摘Large-amplitude electromagnetic radiofrequency fields are created by the charge-separation induced in interactions of high-intensity,short-pulse lasers with solid targets and have intensity that decreases with the distance from the target.Alternatively,it was experimentally proved very recently that charged particles emitted by petawatt laser±target interactions can be deposited on a capacitor-collector structure,far away from the target,and lead to the rapid(nanosecond-scale)generation of large quasi-static electric fields(MV/m),over wide regions.We demonstrate here the generation of both these fields in experiments at the PHELIX laser facility,with approximately 20 J energy and approximately 10^(19)W/cm^(2)intensity,for picoseconds laser pulses,interacting with pre-ionized polymer foams of near critical density.Quasi-static fields,up to tens of k V/m,were here observed at distances larger than 1 m from the target,with results much higher than the radiofrequency component.This is of primary importance for inertial-confinement fusion and laser±plasma acceleration and also for promising applications in different scenarios. | M.Scisciò F.Consoli M.Salvadori N.E.Andreev N.G.Borisenko S.Zähter O.Rosmej | 2021 | High Power Laser Science and Engineering2021，9，4： | 0 |
| 6 | Particle Simulation of the Fast Ignition Mechanism for Laser Fusion显示文摘We have developed the two and half-dimension electromagnetic relativistic electron and mobile ion cloud-in-cell(CIC)code.Mechanisms of the fast ignition and interaction of ultra-intense and ultra-short pulse laser with plasma are analysed theoretically and simulated numerically using CIC code.Strong flows of relativistic electron and form of the channel are observed.The results show that the temperature of superhot electron is about MeV to tens of MeV,and the boring velocity is 0.05c-0.1c with c being the light speed.Some preliminary scale laws are obtained.This simulation quantitatively reproduces the experimental results at early and long times. | 张家泰 何斌 N.E.Andreev | 2001 | Chinese Physics Letters2001，18，6： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员