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 26

Только метаданные
Laser-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.
Только метаданные
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.
Только метаданные
X-ray Self-Emission Imaging of Hydrodynamic Laser-Induced Astrophysical Phenomena
(2022) Filippov, E. D.; Burdonov, K. F.; Pikuz, T. A.; Skobelev, I. Y.; Бурдонов, Константин Феликсович; Скобелев, Игорь Юрьевич
In this article, we present an overview of the application of X-ray self-emission methods for the imaging of hydrodynamic astrophysical phenomena in laboratory-scale experiments. Typical diagnostic approaches, their advantages, drawbacks, and application perspectives are considered. We show that X-ray imaging and spectroscopy methods with 2D and even 1D spatial resolution are valuable for numerous laboratory astrophysical problems. Furthermore, the methods revealed the hydrodynamic evolution, the spatial shape and structure, and spatial features of important parameters such as electron density and plasma temperature of astrophysical objects and related phenomena, which are also required for the verification of astrophysical models.
Только метаданные
The Role of Stepwise Photoionization in Measurements of the Ionization Potentials in Dense Plasma
(2023) Skobelev, I. Y.; Ryazantsev, S. N.; Kulikov, R. K.; Pikuz, S. A.; Скобелев, Игорь Юрьевич; Куликов, Роман Константинович
The interaction of high-contrast high-intensity laser radiation with solids allows us to create hot or warm plasma of solid or even over-solid density, such as in the case of inertial fusion particularly. The multicharged ions contained in it can no longer be considered isolated. As a result, this leads to a decrease in the ionization potentials and to the disappearance of a number of bound ionic states. To describe the ionization potential depression, two major approaches are now used predominantly, where the key parameter is either average interelectronic or interionic distance. Since neither of the approaches can be substantiated purely theoretically, their applicability can only be established by comparison with experimental results. In recent experiments with X-ray free-electron lasers, it was concluded that the ionization potential depression rather depends on the interelectronic distance. However, when measuring ionization potentials, it was assumed that the main role in ionization processes is played by the direct photoionization of the ion ground state. In the present paper, we show that stepwise photoionization processes should play a significant role in dense plasma, disrupting a straight correspondence between the threshold in direct photoionization by X-ray laser photons and the actual ionization potential of multicharged ions. It means that the measurement results mentioned above are not correct, and the main conclusion about the importance of the interelectronic distance for depression of the ionization potential is not correct.
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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
Только метаданные
Enhancement of K-shell spectroscopy for temperature measuring of isochorically heated matter in the sub-keV range
(2023) Martynenko, A. S.; Pikuz, T. A.; Skobelev, I. Y.; Pikuz, S. A.; Скобелев, Игорь Юрьевич
Только метаданные
On X-ray Spectral Diagnostics of Laser Plasma with External Photon Pumping
(2024) Kulikov, R. K.; Skobelev, I. Y.; Makarov, S. S.; Куликов, Роман Константинович; Скобелев, Игорь Юрьевич
Только метаданные
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
Только метаданные
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.
Только метаданные
A 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.