| 1. |
- Bashinov, A. V., et al.
(author)
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Electron acceleration and emission in a field of a plane and converging dipole wave of relativistic amplitudes with the radiation reaction force taken into account
- 2013
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In: Quantum electronics (Woodbury, N.Y.). - 1063-7818 .- 1468-4799. ; 43:4, s. 291-299
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Journal article (peer-reviewed)abstract
- A comparative analysis is performed of the electron emission characteristics as the electrons move in laser fields with ultra-relativistic intensity and different configurations corresponding to a plane or tightly focused wave. For a plane travelling wave, analytical expressions are derived for the emission characteristics, and it is shown that the angular distribution of the radiation intensity changes qualitatively even when the wave intensity is much less than that in the case of the radiation-dominated regime. An important conclusion is drawn that the electrons in a travelling wave tend to synchronised motion under the radiation reaction force. The characteristic features of the motion of electrons are found in a converging dipole wave, associated with the curvature of the phase front and nonuniformity of the field distribution. The values of the maximum achievable longitudinal momenta of electrons accelerated to the centre, as well as their distribution function are determined. The existence of quasi-periodic trajectories near the focal region of the dipole wave is shown, and the characteristics of the emission of both accelerated and oscillating electrons are analysed.
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| 2. |
- Bashinov, A. V., et al.
(author)
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Towards attosecond-scale highly directed GeV gamma-ray sources with multipetawatt-class lasers
- 2017
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In: Journal of Optics. - : IOP Publishing. - 2040-8978 .- 2040-8986. ; 19:11
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Journal article (peer-reviewed)abstract
- We consider a possibility of constructing a gamma-ray source based on the multibeam configuration of a multipetawatt laser system which we simulate using a converging dipole wave. It is shown that such a configuration of fields allows the generation of gamma radiation with narrow directivity of about 1 mrad in the form of pulse trains or isolated pulses on the attosecond timescale. The influence of quantum electrodynamic cascade development on the parameters of generated gamma bursts is studied.
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| 3. |
- Gonoskov, Arkady, 1984, et al.
(author)
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Ultrabright GeV Photon Source via Controlled Electromagnetic Cascades in Laser-Dipole Waves
- 2017
-
In: Physical Review X. - 2160-3308. ; 7:4
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Journal article (peer-reviewed)abstract
- Electromagnetic cascades have the potential to act as a high-energy photon source of unprecedented brightness. Such a source would offer new experimental possibilities in fundamental science, but in the cascade process radiation reaction and rapid electron-positron plasma production seemingly restrict the efficient production of photons to sub-GeV energies. Here, we show how to overcome these energetic restrictions and how to create a directed GeV photon source, with unique capabilities as compared to existing sources. Our new source concept is based on a controlled interplay between the cascade and anomalous radiative trapping. Using specially designed advanced numerical models supported with analytical estimates, we demonstrate that the concept becomes feasible at laser powers of around 7 PW, which is accessible at soon-to-be-available facilities. A higher peak power of 40 PW can provide 10(9) photons with GeV energies in a well-collimated 3-fs beam, achieving peak brilliance 9 x 10(24) ph s(-1) mrad(-2) mm(-2)/0.1%BW.
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| 4. |
- Meyerov, I., et al.
(author)
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Hybrid CPU + Xeon Phi implementation of the Particle-in-Cell method for plasma simulation
- 2016
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In: Supercomputing Frontiers and Innovations. - : FSAEIHE South Ural State University (National Research University). - 2313-8734 .- 2409-6008. ; 3:3, s. 5-10
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Journal article (peer-reviewed)abstract
- This paper presents experimental results of Particle-in-Cell plasma simulation on a hybrid system with CPUs and Intel Xeon Phi coprocessors. We consider simulation of two relevant laserdriven particle acceleration regimes using the Particle-in-Cell code PICADOR. On a node of a cluster with 2 CPUs and 2 Xeon Phi coprocessors the hybrid CPU + Xeon Phi configuration allows to fully utilize the computational resources of the node. It outperforms both CPU-only and Xeon Phi-only configurations with the speedups between 1.36 x and 1.68 x.
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| 5. |
- Muraviev, A. A., et al.
(author)
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Generation of current sheets and giant quasistatic magnetic fields at the ionization of vacuum in extremely strong light fields
- 2015
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In: JETP Letters. - 1090-6487 .- 0021-3640. ; 102:3, s. 148-153
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Journal article (peer-reviewed)abstract
- The self-consistent dynamics of an electron–positron plasma, which is formed during the generation of quantum-electrodynamic cascades, in a superstrong field of counterpropagating linearly polarized waves is examined. It is shown that the formation of thin (on a wavelength scale) current sheets which generate quasistatic magnetic fields comparable to the corresponding fields of incident waves plays an important role in the dynamics of a cascade for fields above a certain threshold. The fraction of the laser energy transformed into the energy of quasistatic magnetic fields can exceed 20%.
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| 6. |
- Efimenko, E., et al.
(author)
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Extreme plasma states in laser-governed vacuum breakdown
- 2018
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322 .- 2045-2322. ; 8:1
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Journal article (peer-reviewed)abstract
- Triggering vacuum breakdown at laser facility is expected to provide rapid electron-positron p air production for studies in laboratory astrophysics and fundamental physics. However, the density of the produced plasma may cease to increase at a relativistic critical density, when the plasma becomes opaque. Here, we identify the opportunity of breaking this limit using optimal beam configuration of petawatt-class lasers. Tightly focused laser fields allow generating plasma in a small focal volume much less than λ 3 and creating extreme plasma states in terms of density and produced currents. These states can be regarded to be a new object of nonlinear plasma physics. Using 3D QED-PIC simulations we demonstrate a possibility of reaching densities over 10 25 cm -3, which is an order of magnitude higher than expected earlier. Controlling the process via initial target parameters provides an opportunity to reach the discovered plasma states at the upcoming laser facilities.
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| 7. |
- Gonoskov, Arkady, et al.
(author)
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Anomalous radiative trapping in laser fields of extreme intensity
- 2014
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In: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 113, s. 014801-
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Journal article (peer-reviewed)abstract
- We demonstrate that charged particles in a suciently intense standing wave are compressed toward, and oscillate synchronously at, the antinodes of the electric eld. We call this unusualbehaviour `anomalous radiative trapping' (ART). We show using dipole pulses, which oer a pathto increased laser intensity, that ART opens up new possibilities for the generation of radiationand particle beams, both of which are high-energy, directed and collimated. ART also provides a mechanism for particle control in high-intensity quantum-electrodynamics experiments.
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| 8. |
- Muraviev, A., et al.
(author)
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Particle dynamics governed by radiation losses in extreme-field current sheets
- 2021
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In: Physical Review E. - 2470-0045 .- 2470-0053. ; 104
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Journal article (peer-reviewed)abstract
- Particles moving in current sheets under extreme conditions, such as those in the vicinity of pulsars or those predicted on upcoming multipetawatt laser facilities, may be subject to significant radiation losses. We present an analysis of particle motion in model fields of a relativistic neutral electron-positron current sheet in the case when radiative effects must be accounted for. In the Landau-Lifshitz radiation reaction force model, when quantum effects are negligible, an analytical solution for particle trajectories is derived. Based on this solution, for the case when quantum effects are significant an averaged quantum solution in the semiclassical approach is obtained. The applicability region of the solutions is determined and analytical trajectories are found to be in good agreement with those of numerical simulations which account for radiative effects. Based on these results we demonstrate that radiation reaction itself can provide a mechanism of pinching even within a given field consideration.
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| 9. |
- Bashinov, A. V., et al.
(author)
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New horizons for extreme light physics with mega-science project XCELS
- 2014
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In: European Physical Journal: Special Topics. - : Springer Science and Business Media LLC. - 1951-6401 .- 1951-6355. ; 223:6, s. 1105-1112
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Research review (peer-reviewed)abstract
- A short review of the Russian mega-science project XCELS and scientific problems to be solved are presented. We discuss the origin of multi-beam design to attain the highest field magnitude at optimal focusing. Then, we formulate particular physical problems of fundamental interest that can be solved within this project.
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| 10. |
- Volokitin, V., et al.
(author)
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Optimized event generator for strong-field QED simulations within the hi-χ framework
- 2023
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In: Journal of Computational Science. - 1877-7503. ; 74
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Journal article (peer-reviewed)abstract
- Probabilistic generation of photons and electron-positron pairs due to the processes of strong-field quantum electrodynamics (SFQED) is often the most resource-intensive part of the kinetic simulations required in order to model current and future experimental studies at high-intensity laser facilities. To reduce its computational demands one can exploit tabulation of the precomputed rates, time-step sub-cycling, dynamic down-sampling of particle/photon ensembles and other approaches. As the culmination of previous improvements, the method described here provides the opportunity to make the minimal possible number of rate computations per QED event. In some of our tests, this method was shown to increase performance by more than an order of magnitude. The computational routine is publicly available as a part of the open-source framework hi-chi designed as a Python-controlled toolbox for collaborative development.
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