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Sökning: WFRF:(Bashinov A.) > (2017)

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1.
  • Bashinov, A. V., et al. (författare)
  • Towards attosecond-scale highly directed GeV gamma-ray sources with multipetawatt-class lasers
  • 2017
  • Ingår i: Journal of Optics. - : IOP Publishing. - 2040-8978 .- 2040-8986. ; 19:11
  • 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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2.
  • Gonoskov, Arkady, 1984, et al. (författare)
  • Ultrabright GeV Photon Source via Controlled Electromagnetic Cascades in Laser-Dipole Waves
  • 2017
  • Ingår i: Physical Review X. - 2160-3308. ; 7:4
  • Tidskriftsartikel (refereegranskat)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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