Персона:
Скобелев, Игорь Юрьевич

Организационные подразделения

Организационная единица

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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Теперь показываю 1 - 10 из 42

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X-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 Юрьевич
Density 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.
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Study 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.
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Thermalization 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.
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Technique for Plasma Diagnostics Based on Resonance Lines of Ne-Like Kr XXVII Ion and Its Satellites
(2025) Skobelev, I. Y.; Kulikov, R. K.; Ryazantsev, S. N.; Скобелев, Игорь Юрьевич; Куликов, Роман Константинович; Рязанцев, Сергей Николаевич
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Features 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 Юрьевич
Copyright © 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.
Открытый доступ
ЭКСПЕРИМЕНТАЛЬНОЕ ИССЛЕДОВАНИЕ ЗАСЕЛЕНИЯ ИЗОМЕРНЫХ СОСТОЯНИЙ 83KR В ФЕМТОСЕКУНДОЙ ЛАЗЕРНОЙ ПЛАЗМЕ
(НИЯУ МИФИ, 2026) РЯЗАНЦЕВ, С. Н.; МАКАРОВ, С. С.; СКОБЕЛЕВ, И. Ю.; Макаров, Сергей Станиславович; Рязанцев, Сергей Николаевич; Скобелев, Игорь Юрьевич
Рассмотрены результаты эксперимента по заселению изомерных состояний 83Kr путем облучения сверхзвукового газово-кластерного потока Kr фемтосекундным лазерным импульсом петаваттной мощности. На основе экспериментально зарегистрированной интенсивности спектральной линии, соответствующей радиационному распаду изомерного состояния 9.4 кэВ показано, что эффективность заселения состояния составляет ~1010 частиц за один акт облучения.
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Absolute keV x-ray yield and conversion efficiency in over dense Si sub-petawatt laser plasma
(2022) Ryazantsev, S. N.; Martynenko, A. S.; Sedov, M. V.; Skobelev, I. Y.; Pikuz, S. A.; Скобелев, Игорь Юрьевич; Рязанцев, Сергей Николаевич; Седов, Максим Владимирович
Laser-produced plasmas are bright, short sources of X-rays often used for time-resolved imaging and spectroscopy. Absolute measurement requires accurate knowledge of laser-to-x-ray conversion efficiencies, spectrum, photon yield and angular distribution. Here we report on soft X-ray emission from a thin Si foil irradiated by a sub-PW picosecond laser pulse. These absolute measurements cover a continuous and broad spectral range that extends from 4.75 to 7.5 Angstroms (1.7-2.6 keV). The X-ray spectrum consists of spectral line transitions from highly charged ions and broadband emission with contributions from recombination, and free-free processes that occur as electrons decelerate in plasma electromagnetic fields. These quantitative measurements are compared to particle-in-cell simulations allowing us to distinguish bremsstrahlung and synchrotron contributions to the free-free emission. We found that experiment and simulation estimations of laser-to-bremsstrahlung conversion efficiency are in a good agreement. This agreement illustrates the accuracy of experiment and physical interpretation of the measurements.
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Effect 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 Юрьевич
The 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.
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Generation of Soft X-Ray and Vacuum Ultraviolet Radiation during the Interaction of a Hydrogen Plasma Flow with a Gas Jet
(2023) Toporkov, D. A.; Burmistrov, D. A.; Gavrilov, V. V.; Zhitlukhin, A. M.; Pikuz, S. A.; Skobelev, I. Y.; Скобелев, Игорь Юрьевич
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Precision Measurements of X-Ray Spectra for the Diagnosis of Laboratory Astrophysical Plasma
(2023) Ryazantsev, S. N.; Skobelev, I. Y.; Kuznetsov, A. P.; Kulikov, R. K.; Pikuz, S. A.; Скобелев, Игорь Юрьевич; Кузнецов, Андрей Петрович; Куликов, Роман Константинович; Рязанцев, Сергей Николаевич