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Restoration of the focal parameters for an extreme-power laser pulse with ponderomotively scattered proton spectra by using a neural network algorithm

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Matter and Radiation at Extremes 2023年第1期8卷 28-42页

作者： N.D.Bukharskii O.E.Vais ph.a.korneev V.Yu.Bychenkov National Research Nuclear University MEphI MoscowRussian Federation P.N.Lebedev physical Institute MoscowRussian Federation Center for Fundamental and Applied Research Dukhov Research Institute of Automatics(VNIIA)MoscowRussian Federation

A neural network-based approach is proposed both for reconstructing the focal spot intensity profile and for estimating the peak intensity of a high-power tightly focused laser pulse using the angular energy distributions of protons accelerated by the pulse from rarefied *** these purposes,we use a convolutional neural network *** and testing datasets are calculated using the test particle method,with the laser description in the form of Stratton-Chu integrals,which model laser pulses focused by an off-axis parabolic mirror down to the diffraction *** demonstrate the power and robustness of this method,we discuss the reconstruction of axially symmetric intensity profiles for laser pulses with intensities and focal diameters in the ranges of 10^(21)-10^(23) W cm^(−2) and ~(1-4)λ,*** approach has prospects for implementation at higher intensities and with asymmetric laser beams,and it can provide a valuable diagnostic method for emerging extremely intense laser facilities.

关键词： network pulse power

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Intense widely controlled terahertz radiation from laser-driven wires

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Matter and Radiation at Extremes 2023年第4期8卷 1-15页

作者： N.Bukharskiia ph.korneev National Research Nuclear University MEphI 31 Kashirskoe shosse115409 MoscowRussian Federation

Irradiation of a thin metallic wire with an intense femtosecond laser pulse creates a strong discharge wave that travels as a narrow pulse along the wire *** traveling discharge efficiently emits secondary radiation with spectral characteristics that are mostly defined by the wire *** examples of designs are considered here in the context of generation of intense terahertz radiation with controllable characteristics for various scientific and technological *** proposed setup may be easily realized,and it has the merits of robustness,versatility,and high conversion efficiency(reaching several percent)of laser energy to terahertz radiation.

关键词： laser intense characteristics

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Laser-driven electrodynamic implosion of fast ions in a thin shell

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Matter and Radiation at Extremes 2023年第5期8卷 73-81页

作者： S.Yu.Gus’kov ph.korneev M.Murakami P.N.Lebedev physical Institute of Russian Academy of Sciences 53 Leninskii Prospect119991 MoscowRussian Federation Institute of Laser Engineering Osaka University565-0871 OsakaJapan

Collision of laser-driven subrelativistic high-density ion flows provides a way to create extremely compressed ion conglomerates and study their *** paper presents a theoretical study of the electrodynamic implosion of ions inside a hollow spherical or cylindrical shell irradiated by femtosecond petawatt laser *** propose to apply a very effective mechanism for ion acceleration in a self-consistent field with strong charge separation,based on the oscillation of laser-accelerated fast electrons in this field near the thin *** electrons are generated on the outer side of the shell under irradiation by the intense laser *** is shown that ions,in particular protons,may be accelerated at the implosion stage to energies of tens and hundreds of MeV when a sub-micrometer shell is irradiated by femtosecond laser pulses with an intensity of 10^(21)–10^(23)W cm^(−2).

关键词： dynamic thin irradiated

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