Персона:
Корнеев, Филипп Александрович

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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Корнеев

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Филипп Александрович

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Теперь показываю 1 - 10 из 10

Только метаданные
Stochastic electron heating in an interference field of several laser pulses of a picosecond duration
(2019) Bochkarev, S. G.; D'Humieres, E.; Tikhonchuk, V. T.; Bychenkov, V. Yu.; Korneev, P.; Корнеев, Филипп Александрович
© 2019 IOP Publishing Ltd. Efficient electron acceleration and heating is demonstrated in a multimode structure created by interference of several laser beams of a relativistic intensity and a picosecond duration near a sharp target boundary. Electron energization proceeds in two steps, with a slow stochastic heating followed by a fast regular acceleration in a resonance interaction with one of wave packets. It results in formation of a population of energetic electrons with an exponential distribution in energy characterized by a high effective temperature and a sharp cutoff. Hot electron characteristics depend on the number of crossing laser beams and their respective angles. This process is an example of efficient electron heating in vacuum by electromagnetic fields without participation of electrostatic plasma waves. It might contribute to creation of a superthermal particle population with an effective temperature significantly exceeding the common ponderomotive scaling.
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Hydrodynamic model of plasma evolution under heating by high-energy ion flux
(2019) Gus'Kov, S. Y.; Korneev, P. A.; Solyanikova, M. S.; Корнеев, Филипп Александрович
© Published under licence by IOP Publishing Ltd.The analytical solution is found for thermodynamic state of plasma created when the half-space is heating by high-energy ion flow. The dependence of free path length of heating ions on plasma temperature is taken into account. Besides, an analysis of characteristic parameters of shock wave and efficiency of energy transfer to shock wave from heating ion flow is given.
Открытый доступ
Laboratory investigation of particle acceleration and magnetic field compression in collisionless colliding fast plasma flows
(2019) Higginson, D. P.; Ruyer, C.; Riquier, R.; Moreno, Q.; Korneev, P. h.; Pikuz, S. A.; Корнеев, Филипп Александрович
In many natural phenomena in space (cosmic-rays, fast winds), non-thermal ion populations are produced, with wave-particle interactions in self-induced electromagnetic turbulence being suspected to be mediators. However, the processes by which the electromagnetic energy is bestowed upon the particles is debated, and in some cases requires field compression. Here we show that laboratory experiments using high-power lasers and external strong magnetic field can be used to infer magnetic field compression in the interpenetration of two collisionless, high-velocity (0.01-0.1c) quasi-neutral plasma flows. This is evidenced through observed plasma stagnation at the flows collision point, which Particle-in-Cell (PIC) simulations suggest to be the signature of magnetic field compression into a thin layer, followed by its dislocation into magnetic vortices. Acceleration of protons from the plasma collision is observed as well. As a possible scenario, with 1D and 2D PIC simulations we consider a compression of the vortices against dense plasma remnants.
Только метаданные
Specifics of powerful shock initialization by energetic ion beam
(2019) Gus'kov, S. Yu.; Solyanikova, M. S.; Korneev, Ph. A.; Корнеев, Филипп Александрович
An analytical model for heating matter in the semi-infinite space by a high-energy ion flow is presented. The obtained solution obtained describes the temporal evolution of the thermodynamics and hydrodynamics of plasma in the heated region. It counts for the general stopping power dependence on plasma temperature. While the matter is heated, the mean free path of heating ions changes functionally with temperature. Namely, it does not depend on the plasma temperature at the beginning and increases with the temperature after it passes a thermal threshold. At this threshold, the thermal velocity of plasma electrons is equal to the velocity of the ions in the heating beam. The solution shows that the most advantageous regime for the initialization of the quasi-stationary shock wave realizes when the ion energy is equal to the thermal threshold. This regime corresponds to the maximum shock pressure and the slowest subsequent pressure decay with time. Special attention is devoted to the powerful shock wave driven by the laser-accelerated fast ion beam. For example, a Gbar shock pressure may be achieved by heating an aluminum target by a proton beam with intensity of about 5 x 10(15) W cm(-2) and particle energy of about 4 MeV.
Только метаданные
Collisionless Shocks Driven by Supersonic Plasma Flows with Self-Generated Magnetic Fields
(2019) Li, C. K.; Tikhonchuk, V. T.; Moreno, Q.; Sio, H.; Korneev, P.; Корнеев, Филипп Александрович
© 2019 American Physical Society.Collisionless shocks are ubiquitous in the Universe as a consequence of supersonic plasma flows sweeping through interstellar and intergalactic media. These shocks are the cause of many observed astrophysical phenomena, but details of shock structure and behavior remain controversial because of the lack of ways to study them experimentally. Laboratory experiments reported here, with astrophysically relevant plasma parameters, demonstrate for the first time the formation of a quasiperpendicular magnetized collisionless shock. In the upstream it is fringed by a filamented turbulent region, a rudiment for a secondary Weibel-driven shock. This turbulent structure is found responsible for electron acceleration to energies exceeding the average energy by two orders of magnitude.
Только метаданные
Fast fine-scale spark filamentation and its effect on the spark resistance
(2019) Parkevich, E. V.; Medvedev, M. A.; Ivanenkov, G. V.; Khirianova, A. I.; Korneev, Ph. A.; Корнеев, Филипп Александрович
Formation of a millimeter-sized spark discharge in ambient air is traced on a nanosecond time scale using multi-frame laser probing with an exposure time of 70 ps and spatial resolution of 3-4 mu m. The discharge is initiated by a 25 kV voltage pulse with a rise time of 4 ns, with the pulse applied to the gap formed by a point cathode and flat anode. It is demonstrated that the gap breakdown is accompanied by the fast (similar to 1 ns) formation of a highly ionized homogeneous spark channel originating from the point cathode. We discover that the fast fine-scale filamentation of the homogeneous spark channel arises several nanoseconds after the breakdown and at some distance from the cathode, which results in a complex filamentary structure of the channel. We find that the growing spark channel, in fact, develops in the form of multiple (N greater than or similar to 10) rapidly-evolving filaments that constitute micron-sized (similar to 10-50 mu m) plasma channels with an electron density of n(e) similar to 10(19)-10(20) cm(-3) and subnanosecond characteristic evolution time. First filaments appear at the top of the developing homogenous spark channel. Further, the growing filaments are split themselves, and their number is increased over time up to several tens. Our findings indicate that the fast fine-scale filamentation is one of the important mechanisms governing the spark channel resistance after the breakdown.
Только метаданные
Kinetic plasma waves carrying orbital angular momentum
(2019) Blackman, D. R.; Nuter, R.; Tikhonchuk, V. T.; Korneev, P. h.; Корнеев, Филипп Александрович
The structure of Langmuir plasma waves carrying a finite orbital angular momentum is revised in the paraxial approximation. It is shown that the kinetic effects related to higher-order momenta of the electron distribution function lead to coupling of Laguerre-Gaussian modes and result in a modification of the wave dispersion and damping. The theoretical analysis is compared to the three-dimensional particle-in-cell numerical simulations for a mode with orbital momentum l = 2. It is demonstrated that propagation of such a plasma wave is accompanied with generation of quasistatic axial and azimuthal magnetic fields which result from the orbital and longitudinal momenta transported with the wave, respectively.
Только метаданные
Magnetic field generation from a coil-shaped foil by a laser-triggered hot-electron current
(2019) Brantov, A. V.; Bychenkov, V. Yu.; Korneev, P. h.; Корнеев, Филипп Александрович
A strong electron current triggered by a femtosecond relativistically intense laser pulse in a foil coil-like target is shown to be able to generate a solenoidal-type extremely strong magnetic field. The magnetic field lifetime sufficiently exceeds the laser pulse duration and is defined mainly by the target properties. The process of the magnetic field generation was studied with 3D PIC simulations. It is demonstrated that the pulse and the target parameters allow controlling the field strength and duration. The scheme studied is of great importance for laser-based magnetization technologies.
Только метаданные
Twisted Kinetic Plasma Waves
(2019) Blackman, D. R.; Nuter, R.; Tikhonchuk, V. T.; Korneev, P.; Корнеев, Филипп Александрович
© 2019, Springer Science+Business Media, LLC, part of Springer Nature.Similarly to electromagnetic waves, plasma waves can also carry an orbital angular momentum. A key distinction from electromagnetic waves is that plasma waves are intrinsically coupled to electrons and may deposit their momentum with electrons, resulting in their secular motion and generation of quasistatic magnetic fields. In this paper, we present an analysis of kinetic plasma waves carrying an orbital angular momentum in the paraxial approximation by considering the energy and momentum exchange between the wave and electrons and the average electron motion induced by plasma wave damping.
Только метаданные
Elaboration of 3-frame complex interferometry for optimization studies of capacitor-coil optical magnetic field generators
(2019) Pisarczyk, T.; Santos, J. J.; Dudzak, R.; Zaras-Szydowska, A.; Gus'kov, S. Y.; Korneev, P.; Kochetkov, I.; Корнеев, Филипп Александрович; Кочетков, Юрий Владимирович
Recently developed three-frame complex-interferometry system driven by a Ti:Sa laser with 40 fs pulse has been installed at the PALS (Prague Asterix Laser System) laser facility. This unique diagnostic allows for the first time to perform simultaneous measurements of B-field in the coil region of the capacitor-coil targets (CCT) and the self-generated B-field (SMF) of the diode plasma in between the CCT-plates. CCT were irradiated by the PALS iodine laser (lambda = 1315 nm) with energy in the range 250-500 J and pulse duration of 350 ps at full width at half maximum. The operation of this diagnostic system and methodologies for quantitative data analysis are presented in this study, including: (i) obtaining information about the induction of the magnetic field in the CCT coil based on measurements of the Faraday effect in the TGG (Terbium Gallium Garnet) paramagnetic crystal at the coil vicinity and (ii) determining magnetic field and current density distributions in the capacitor region of the CCT by analysis of the complex interferograms. The preliminary measurements confirmed the high potential of the reported setup for optimization studies of CCT targets.