| 1. |
- 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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| 2. |
- Sergeev, Alexander M., et al.
(författare)
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Generation of giant attosecond pulses at the plasma surface in the regime of relativistic electronic spring
- 2011
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Ingår i: Diode-Pumped High Energy and High Power Lasers; ELI. - : SPIE - International Society for Optical Engineering. - 9780819486707
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Konferensbidrag (refereegranskat)abstract
- The generation of attosecond pulses with an amplitude greatly exceeding the driving field of an ultrarelativistic laser pulse at oblique irradiation of a solid target is investigated. We develop a universal model of the process, the so-called relativistic electronic spring, which is different from the conventional concept of an oscillating mirror. It follows from the model that there exists a parameter region where the energy conversion from the femto- to the attosecond regime is maximal. Based on the study we propose a new concept of laser pulse interaction with a target having a groove-shaped surface, which opens up the potential to exceed an intensity level of 1026 W/cm(2) and observe effects due to nonlinear quantum electrodynamics with upcoming laser sources.
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| 3. |
- Efimenko, E., et al.
(författare)
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Extreme plasma states in laser-governed vacuum breakdown
- 2018
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Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322 .- 2045-2322. ; 8:1
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Tidskriftsartikel (refereegranskat)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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| 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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