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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Теперь показываю 1 - 4 из 4
- 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 метаданныеPossibility of estimating high-intensity-laser plasma parameters by modelling spectral line profiles in spatially and time-integrated X-ray emission(2019) Martynenko, A. S.; Skobelev, I. Yu.; Pikuz, S. A.; Скобелев, Игорь ЮрьевичWe address an issue of measuring the parameters of an envolving laser-produced plasma commonly observable in high-energy density physics experiments. Available diagnostic equipment does not provide enough temporal, and often spatial, resolution to distinguish the signal coming from the region and timeframe of outmost interest, where deposited energy density reaches its maximum. In this paper, we propose and describe an approach that makes it possible to estimate the plasma parameters existing at the time of the main laser pulse arrival, as well as on later stages of plasma expansion. It is based on the analysis of X-ray spectral line profiles in multicharged ion spectra registered in simple time and spatially integrated mode. As an example, specific calculations were made for Ly line of Al XIII and He line of Al XII and can be used to diagnose aluminum plasmas with an electron temperature of 400-1000eV, assuming that expanding plasma was homogeneous at every moment.
- ПубликацияОткрытый доступX-ray spectroscopy evidence for plasma shell formation in experiments modeling accretion columns in young stars(2019) Filippov, E. D.; Revet, G.; Chen, S. N.; Khiar, B.; Skobelev, I. Y.; Pikuz, S. A.; Скобелев, Игорь Юрьевич© 2019 Author(s).Recent achievements in laboratory astrophysics experiments with high-power lasers have allowed progress in our understanding of the early stages of star formation. In particular, we have recently demonstrated the possibility of simulating in the laboratory the process of the accretion of matter on young stars [G. Revet et al., Sci. Adv. 3, e1700982 (2017)]. The present paper focuses on X-ray spectroscopy methods that allow us to investigate the complex plasma hydrodynamics involved in such experiments. We demonstrate that we can infer the formation of a plasma shell, surrounding the accretion column at the location of impact with the stellar surface, and thus resolve the present discrepancies between mass accretion rates derived from X-ray and optical-radiation astronomical observations originating from the same object. In our experiments, the accretion column is modeled by having a collimated narrow (1 mm diameter) plasma stream first propagate along the lines of a large-scale external magnetic field and then impact onto an obstacle, mimicking the high-density region of the stellar chromosphere. A combined approach using steady-state and quasi-stationary models was successfully applied to measure the parameters of the plasma all along its propagation, at the impact site, and in the structure surrounding the impact region. The formation of a hot plasma shell, surrounding the denser and colder core, formed by the incoming stream of matter is observed near the obstacle using X-ray spatially resolved spectroscopy.