Персона: Скобелев, Игорь Юрьевич
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Скобелев
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Игорь Юрьевич
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- ПубликацияТолько метаданныеA Soft X-Ray Radiation Source Formed in Supersonic Argon Gas Jets under the Action of High-Contrast Femtosecond Laser Pulses of Relativistic Intensity(2020) Alkhimova, M. A.; Mishchenko, M. D.; Boldarev, A. S.; Jie, F.; Ryazantsev, S. N.; Skobelev, I. Y.; Pikuz, S. A.; Скобелев, Игорь Юрьевич© 2020, Pleiades Publishing, Ltd.Abstract: The possibility of designing a compact source of soft X-ray radiation without the accompanying generation of fast electrons is under study. The source is formed by the interaction of high-contrast femtosecond laser pulses of relativistic intensity with supersonic argon gas jets. The optimal conditions are found under which the conversion coefficient to soft X-ray radiation in the range of 2.9–3.3 keV reaches 8.57 × 10–5.
- ПубликацияТолько метаданныеEffect of plastic coating on the density of plasma formed in Si foil targets irradiated by ultra-high-contrast relativistic laser pulses(2020) Martynenko, A. S.; Pikuz, S. A.; Skobelev, I. Y.; Ryazantsev, S. N.; Скобелев, Игорь ЮрьевичThe formation of high energy density matter occurs in inertial confinement fusion, astrophysical, and geophysical systems. In this context, it is important to couple as much energy as possible into a target while maintaining high density. A recent experimental campaign, using buried layer (or "sandwich" type) targets and the ultrahigh laser contrast Vulcan petawatt laser facility, resulted in 500 Mbar pressures in solid density plasmas (which corresponds to about 4.6 x 10(7) J/cm(3) energy density). The densities and temperatures of the generated plasma were measured based on the analysis of x-ray spectral line profiles and relative intensities.
- ПубликацияТолько метаданныеX-ray spectroscopy validation of ionization potential depression models in dense plasma created by petawatt laser pulses(2020) Martynenko, A. S.; Pikuz, S. A.; Ryazantsev, S. N.; Skobelev, I. Y.; Скобелев, Игорь ЮрьевичDensity effects have great importance for studying the state of matter at high energy densities both for astrophysical and laboratory objects. At the moment, the question remains as to which model should be used for the description of the effect of ionization potential depression (IPD) in plasma with densities up to solid-state ones. Recent X-ray free-electron laser based researches claimed the adequacy of an early IPD model of Ecker and Kroll over the well-accepted model of Stewart and Pyatt, provided that these two models give significantly different predictions. Subsequent researches performed with optical lasers have received the opposite result. This work is intended to resolve the existing contradiction in conclusions of mentioned experiments. For the first time, the IPD effect for Si XIII ions of plasma generated by an ultrarelativistic optical laser pulse was described and quantified. We demonstrate the "disappearance" of electronic states up to the state with a principal quantum number of n = 4 (inclusively); the plasma density was varied from the critical to the near-solid one. A radiation-collision code PrismSPECT was used to distinguish different IPD models.
- ПубликацияТолько метаданныеStudy of the Parameters of a High-Intensity Thermal and Coherent X-ray Sources with the Use of LiF Crystal Detector (Review)(2020) Makarov, S. S.; Zhvania, I. A.; Pikuz, T. A.; Pikuz, S. A.; Skobelev, I. Y.; Скобелев, Игорь Юрьевич© 2020, Pleiades Publishing, Ltd.Abstract: We present a review on the use of X-ray detectors based on lithium fluoride crystals both for the determination of the parameters of the X-ray sources and for the recording of radiographic images obtained with them. The results are presented for experiments on a radiographic analysis of biological objects and inorganic structures based on an image obtained from the thermal radiation of a high-temperature laser-plasma source, coherent X-ray radiation of a plasma laser, and a free-electron laser, as well as the generation of higher harmonics of the optical laser radiation.
- ПубликацияТолько метаданныеMethod for the Precise Measurement of Wavelengths for Main Shell Transitions in He- and Li-like Ca Ions(2020) Ryazantsev, S. N.; Skobelev, I. Y.; Mishchenko, M. D.; Pikuz, S. A.; Скобелев, Игорь Юрьевич© 2020, Pleiades Publishing, Ltd.Abstract: A possible approach to obtain a precise experimental data on the atomic structure of highly charged ions is considered. Since the key point determining measurement accuracy is the presence of reference lines with precisely known wavelengths, it is proposed first to to use hydrogen-like reference lines for precise measurements of the helium-like resonant transition and their dielectronic satellites. Then in turn these lines, which exist in the plasma over a wide temperature range, can be used as the reference in the wavelength measurement for other ions. The problems associated with the creation of the plasma conditions under which the reference and measured lines have comparable intensities are discussed. The irradiation of minerals with laser pulses, which, in terms of their chemical composition, are a set of elements with average 15 < Z < 30 and light Z < 15 nuclear charges, is proposed. Several experimental schemes to measure the wavelengths of the spectral lines of multiply charged calcium ions with an expected error of up to 0.125 mÅ are considered as an example.
- ПубликацияТолько метаданныеFeatures of the generation of fast particles from microstructured targets irradiated by high intensity, picosecond laser pulses(2019) Sedov, M. V.; Faenov, A. Ya.; Andreev, A. A.; Ryazantsev, S. N.; Skobelev, I. Yu.; Pikuz, S. A.; Скобелев, Игорь ЮрьевичCopyright © Cambridge University Press 2019. The use of targets with surface structures for laser-driven particle acceleration has potential to significantly boost the particle and radiation energies because of enhanced laser absorption. We investigate, via experiment and particle-in-cell simulations, the impact of micron-scale surface-structured targets on the spectrum of electrons and protons accelerated by a picosecond laser pulse at relativistic intensity. Our results show that, compared with flat-surfaced targets, structures on this scale give rise to a significant enhancement in particle and radiation emission over a wide range of laser-target interaction parameters. This is due to the longer plasma scale length when using micro-structures on the target front surface. We do not observe an increase in the proton cutoff energy with our microstructured targets, and this is due to the large volume of the relief.
- ПубликацияТолько метаданныеLaser-Produced Magnetic-Rayleigh-Taylor Unstable Plasma Slabs in a 20 T Magnetic Field(2019) Khiar, B.; Revet, G.; Ciardi, A.; Burdonov, K.; Skobelev, I. Y.; Pikuz, S. A.; Скобелев, Игорь Юрьевич© 2019 American Physical Society.Magnetized laser-produced plasmas are central to many novel laboratory astrophysics and inertial confinement fusion studies, as well as in industrial applications. Here we provide the first complete description of the three-dimensional dynamics of a laser-driven plasma plume expanding in a 20 T transverse magnetic field. The plasma is collimated by the magnetic field into a slender, rapidly elongating slab, whose plasma-vacuum interface is unstable to the growth of the "classical," fluidlike magnetized Rayleigh-Taylor instability.
- ПубликацияТолько метаданныеThermalization of the plasma arising during counter collision of high-energy plasma flows in a longitudinal magnetic field(2021) Gavrilov, V. V.; Eskov, A. G.; Zhitlukhin, A. M.; Kochnev, D. M.; Pikuz, S. A.; Ryazantsev, S. N.; Skobelev, I. Y.; Скобелев, Игорь Юрьевич© Published under licence by IOP Publishing Ltd.This work is devoted to the study of thermalization of plasma created by head-on collisions of high-energy plasma flows in a longitudinal magnetic field of 0.5-2 T. Hydrodynamic flows contained the energy of 200 kJ with velocities from 2 × 107 to 4 × 107 cm/s and ion density from 2 × 1015 to 4 × 1015 cm-3 were created inside the 2MK-200 facility by two electrodynamic plasma accelerators equipped by a system of pulsed gas injection. Nitrogen, neon and their mixtures with hydrogen and deuterium were implemented as working gases. A process of plasma creating was investigated by near-wall magnetic probes situated in different parts of the interaction chamber. Temporal evolution of the plasma electron temperature had been traced by x-ray photodiodes covered by different filters. It was discovered that the plasma electron temperature changed insignificantly during 6-8 µs after it reached the maximum value, which means that it ionization state can be considered as quasi-stationary.
- ПубликацияТолько метаданныеInteraction of a high-energy plasma flow with a gas jet in the laboratory(2021) Gavrilov, V. V.; Zhitlukhin, A. M.; Kochnev, D. M.; Kostyushin, V. A.; Pikuz, S. A.; Ryazantsev, S. N.; Skobelev, I. Yu.; Скобелев, Игорь Юрьевич© 2021 47th EPS Conference on Plasma Physics, EPS 2021. All right reserved.The main results of the work are as follows: - When a hydrogen plasma flow interacts with a supersonic gas jet of nitrogen or neon (the maximum density in the gas jet reached 1017cm-3), a plasma layer ≈ 3÷4 cm thick for ≈2÷3 μs is formed, which emits soft X-ray radiation. The displacement velocity in the direction of the plasma flow is ≈ 3×106cm/s. Such a high speed of the radiation source movement under one-sided action on a gas jet puts forward certain requirements for the synchronization of counter-propagating plasma flows in the current experiments on two-sided action on a gas jet. - Line emission spectra of multiply charged ions recorded during the interaction of hydrogen plasma flows with jets of nitrogen or neon made it possible to estimate the electron temperature of the plasma formed in these experiments, which in both cases turned out to be at the level of 40 ± 10 eV. However, it should be noted that observed intense resonance Ne VIII lines can be emitted by a plasma only at a temperature of 70÷100 eV.
- ПубликацияТолько метаданныеX-ray diagnostics of laser-induced plasma embedded in strong magnetic field with a varied orientation(2022) Filippov, E. D.; Skobelev, I. Yu.; Pikuz, S. A.; Fuchs, J.; Скобелев, Игорь ЮрьевичThe present work is aimed at the experimental study of the dynamics of laser-induced plasma immersed in a strong poloidal magnetic field with a variable orientation (0{circ}-90{circ} depending on the plasma expansion) and amplitude (up to 30 T). The significance of such studies is especially important for the tasks of laboratory astrophysics and inertial confinement fusion. Electron density and temperature profiles are measured, effects related with plasma collimation, accumulation, as well as separation, generation of instabilities and shocks by the magnetic field are discussed. © 2022 IEEE.