| 1. |
- Soloviev, A. A., et al.
(author)
-
Fast electron generation using PW-class PEARL facility
- 2011
-
In: Nuclear Instruments and Methods in Physics Research Section A. - : Saunders Elsevier. - 0168-9002 .- 1872-9576. ; 653:1, s. 35-41
-
Journal article (peer-reviewed)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.
|
|
| 2. |
- Bashinov, A. V., et al.
(author)
-
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
-
In: Quantum electronics (Woodbury, N.Y.). - 1063-7818 .- 1468-4799. ; 43:4, s. 291-299
-
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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| 3. |
- Bashinov, A. V., et al.
(author)
-
Towards attosecond-scale highly directed GeV gamma-ray sources with multipetawatt-class lasers
- 2017
-
In: Journal of Optics. - : IOP Publishing. - 2040-8978 .- 2040-8986. ; 19:11
-
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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| 4. |
- Gonoskov, Arkady, et al.
(author)
-
Multicascade proton acceleration by a superintense laser pulse in the regime of relativistically induced slab transparency
- 2009
-
In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 102:18, s. 184801-
-
Journal article (peer-reviewed)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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| 5. |
- Bashinov, A. V., et al.
(author)
-
New horizons for extreme light physics with mega-science project XCELS
- 2014
-
In: European Physical Journal: Special Topics. - : Springer Science and Business Media LLC. - 1951-6401 .- 1951-6355. ; 223:6, s. 1105-1112
-
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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| 6. |
- Crenshaw, D. M., et al.
(author)
-
Multiwavelength observations of short-timescale variability in NGC 4151. I. Ultraviolet observations
- 1996
-
In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 470:1, s. 322-335335
-
Journal article (peer-reviewed)abstract
- Presents the results of an intensive ultraviolet monitoring campaign on the Seyfert 1 galaxy NGC 4151, as part of an effort to study its short-timescale variability over a broad range in wavelength. The nucleus of NGC 4151 was observed continuously with the International Ultraviolet Explorer for 9.3 days, yielding a pair of LWP and SWP spectra every ~70 minutes, and during 4 hr periods for 4 days prior to and 5 days after the continuous-monitoring period. The sampling frequency of the observations is an order of magnitude higher than that of any previous UV monitoring campaign on a Seyfert galaxy. The continuum fluxes in bands from 1275 to 2688 Aring went through four significant and well-defined ldquoeventsrdquo of duration 2-3 days during the continuous-monitoring period. The authors find that the amplitudes of the continuum variations decrease with increasing wavelength, which extends a general trend for this and other Seyfert galaxies to smaller timescales (i.e., a few days). The continuum variations in all the UV bands are simultaneous to within an accuracy of ~0.15 days, providing a strict constraint on continuum models. The emission-line light curves show only one major event during the continuous monitoring (a slow rise followed by a shallow dip) and do not correlate well with continuum light curves over the short duration of the campaign, because the timescale for continuum variations is apparently smaller than the response times of the emission lines
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| 7. |
- Gonoskov, Arkady A., et al.
(author)
-
Ultrarelativistic nanoplasmonics as a route towards extreme-intensity attosecond pulses
- 2011
-
In: 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-
-
Journal article (peer-reviewed)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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| 8. |
- Korzhimanov, A. V., et al.
(author)
-
Horizons of petawatt laser technology
- 2011
-
In: Physics-Uspekhi. - Russia/United Kingdom : Institute of Physics Publishing (IOPP). - 0042-1294. ; 54:1, s. 9-28
-
Journal article (peer-reviewed)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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| 9. |
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| 10. |
- Muraviev, A. A., et al.
(author)
-
Generation of current sheets and giant quasistatic magnetic fields at the ionization of vacuum in extremely strong light fields
- 2015
-
In: JETP Letters. - 1090-6487 .- 0021-3640. ; 102:3, s. 148-153
-
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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