| 1. |
- Soloviev, A. A., et al.
(författare)
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Fast electron generation using PW-class PEARL facility
- 2011
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Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Saunders Elsevier. - 0168-9002 .- 1872-9576. ; 653:1, s. 35-41
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Tidskriftsartikel (refereegranskat)abstract
- We use a PW-class PEARL facility to study fast electron beam generation during high intensity laser pulse interaction with a supersonic gas jet. We show that electron beams with several hundreds of MeV and relatively large charges, of hundreds of pC and more, can be effectively produced without any guiding structures. PIC simulations also confirm the obtained experimental data and provide optimized conditions of laser–plasma interaction for high-charged beam production.
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| 2. |
- Bashinov, A. V., et al.
(författare)
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Towards attosecond-scale highly directed GeV gamma-ray sources with multipetawatt-class lasers
- 2017
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Ingår i: Journal of Optics. - : IOP Publishing. - 2040-8978 .- 2040-8986. ; 19:11
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Tidskriftsartikel (refereegranskat)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, et al.
(författare)
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Multicascade proton acceleration by a superintense laser pulse in the regime of relativistically induced slab transparency
- 2009
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 102:18, s. 184801-
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Tidskriftsartikel (refereegranskat)abstract
- The regime of multicascade proton acceleration during the interaction of a 1021–1022 W=cm2 laserpulse with a structured target is proposed. The regime is based on the electron charge displacement under the action of laser ponderomotive force and on the effect of relativistically induced slab transparency which allows realization of the idea of multicascade acceleration. It is shown that a target comprising several thin foils properly spaced apart can optimize the acceleration process and give at the output aquasi-monoenergetic beam of protons with energies up to hundreds of MeV with an energy spread of just a few percent.
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| 4. |
- Gonoskov, Arkady A., et al.
(författare)
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Ultrarelativistic nanoplasmonics as a route towards extreme-intensity attosecond pulses
- 2011
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - Melville, N.Y. : American Physical Society through the American Institute of Physics. - 1539-3755 .- 1550-2376. ; 84:4, s. 046403-
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Tidskriftsartikel (refereegranskat)abstract
- The generation of ultrastrong attosecond pulses through laser-plasma interactions offers the opportunity to surpass the intensity of any known laboratory radiation source, giving rise to new experimental possibilities, such as quantum electrodynamical tests and matter probing at extremely short scales. Here we demonstrate that a laser irradiated plasma surface can act as an efficient converter from the femto- to the attosecond range, giving a dramatic rise in pulse intensity. Although seemingly similar schemes have been described in the literature, the present setup differs significantly from the previous attempts. We present a model describing the nonlinear process of relativistic laser-plasma interaction. This model, which is applicable to a multitude of phenomena, is shown to be in excellent agreement with particle-in-cell simulations. The model makes it possible to determine a parameter region where the energy conversion from the femto- to the attosecond regime is maximal. Based on the study we propose a concept of laser pulse interaction with a target having a groove-shaped surface, which opens up the potential to exceed an intensity level of 10(26) W/cm(2) and observe effects due to nonlinear quantum electrodynamics with upcoming laser sources.
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| 5. |
- Korzhimanov, A. V., et al.
(författare)
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Horizons of petawatt laser technology
- 2011
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Ingår i: Physics-Uspekhi. - Russia/United Kingdom : Institute of Physics Publishing (IOPP). - 0042-1294. ; 54:1, s. 9-28
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Tidskriftsartikel (refereegranskat)abstract
- Recent advances in the development of superpowerlasers are reviewed. A number of possibilities that the newly available petawatt-power level lasers open up in the physics of extreme light fields are discussed.
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| 6. |
- Meyerov, I., et al.
(författare)
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Hybrid CPU + Xeon Phi implementation of the Particle-in-Cell method for plasma simulation
- 2016
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Ingår i: 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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Tidskriftsartikel (refereegranskat)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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| 7. |
- Surmin, I., et al.
(författare)
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Particle-in-Cell laser-plasma simulation on Xeon Phi coprocessors
- 2016
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Ingår i: Computer Physics Communications. - : Elsevier BV. - 0010-4655. ; 202, s. 204-210
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Tidskriftsartikel (refereegranskat)abstract
- This paper concerns the development of a high-performance implementation of the Particle-in-Cell method for plasma simulation on Intel Xeon Phi coprocessors. We discuss the suitability of the method for Xeon Phi architecture and present our experience in the porting and optimization of the existing parallel Particle-in-Cell code PICADOR. Direct porting without code modification gives performance on Xeon Phi close to that of an 8-core CPU on a benchmark problem with 50 particles per cell. We demonstrate step-by-step optimization techniques, such as improving data locality, enhancing parallelization efficiency and vectorization leading to an overall 4.2 x speedup on CPU and 7.5 x on Xeon Phi compared to the baseline version. The optimized version achieves 16.9 ns per particle update on an Intel Xeon E5-2660 CPU and 9.3 ns per particle update on an Intel Xeon Phi 5110P. For a real problem of laser ion acceleration in targets with surface grating, where a large number of macroparticles per cell is required, the speedup of Xeon Phi compared to CPU is 1.6x.
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