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Träfflista för sökning "WFRF:(Gibbon P.) "

Sökning: WFRF:(Gibbon P.)

  • Resultat 1-5 av 5
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1.
  • Aurand, Bastian, et al. (författare)
  • Enhanced radiation pressure-assisted acceleration by temporally tuned counter-propagating pulses
  • 2014
  • Ingår i: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment. - : Elsevier BV. - 0167-5087 .- 0168-9002. ; 740, s. 83-86
  • Tidskriftsartikel (refereegranskat)abstract
    • Within the last decade, laser-ion acceleration has become a field of broad interest. The possibility to generate short proton- or heavy ion bunches with an energy of a few tens of MeV by table-top laser systems could open new opportunities for medical or technical applications. Nevertheless, today's laser-acceleration schemes lead mainly to a temperature-like energy distribution of the accelerated ions, a big disadvantage compared to mono-energetic beams from conventional accelerators. Recent results 111 of laser-ion acceleration using radiation-pressure appear promising to overcome this drawback. In this paper, we demonstrate the influence of a second counter-propagating laser pulse interacting with a nm-thick target, creating a well defined pre-plasma. (C) 2013 Elsevier B.V. All rights reserved.
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2.
  • Aurand, Bastian, et al. (författare)
  • Radiation pressure-assisted acceleration of ions using multi-component foils in high-intensity laser-matter interactions
  • 2013
  • Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 15
  • Tidskriftsartikel (refereegranskat)abstract
    • Experimental results on the acceleration of protons and carbon ions from ultra-thin polymer foils at intensities of up to 6x10(19)Wcm(-2) are presented revealing quasi-monoenergetic spectral characteristics for different ion species at the same time. For carbon ions and protons, a linear correlation between the cutoff energy and the peak energy is observed when the laser intensity is increased. Particle-in-cell simulations supporting the experimental results imply an ion acceleration mechanism driven by the radiation pressure as predicted for multi-component foils at these intensities.
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3.
  • Cardenas, D. E., et al. (författare)
  • Sub-cycle dynamics in relativistic nanoplasma acceleration
  • 2019
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 9
  • Tidskriftsartikel (refereegranskat)abstract
    • The interaction of light with nanometer-sized solids provides the means of focusing optical radiation to sub-wavelength spatial scales with associated electric field enhancements offering new opportunities for multifaceted applications. We utilize collective effects in nanoplasmas with sub-two-cycle light pulses of extreme intensity to extend the waveform-dependent electron acceleration regime into the relativistic realm, by using 106 times higher intensity than previous works to date. Through irradiation of nanometric tungsten needles, we obtain multi-MeV energy electron bunches, whose energy and direction can be steered by the combined effect of the induced near-field and the laser field. We identified a two-step mechanism for the electron acceleration: (i) ejection within a sub-half-optical-cycle into the near-field from the target at >TVm−1 acceleration fields, and (ii) subsequent acceleration in vacuum by the intense laser field. Our observations raise the prospect of isolating and controlling relativistic attosecond electron bunches, and pave the way for next generation electron and photon sources.
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4.
  • Gopal, A., et al. (författare)
  • MegaGauss magnetic field generation by ultra-short pulses at relativistic intensities
  • 2013
  • Ingår i: Plasma Physics and Controlled Fusion. - : IOP Publishing. - 0741-3335 .- 1361-6587. ; 55:3
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the experimental studies on megaGauss magnetic field generation using a 35 femtosecond laser at relativistic intensities. The polarization change of the self-generated harmonics was recorded to estimate the magnetic field. A parameter scan was performed by varying the input laser intensity as well as the contrast ratio. External optical probing diagnostics were performed using the second harmonic of the incident laser. Additionally, the optical transition radiation from the rear of the target was also recorded.
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5.
  • Veisz, Laszlo, et al. (författare)
  • Sub-5-fs laser-driven nanophotonics in the relativistic intensity regime
  • 2018
  • Ingår i: Optics InfoBase Conference Papers. - : Optica Publishing Group. - 9781557528209
  • Konferensbidrag (refereegranskat)abstract
    • We investigated the interaction of nanometric tungsten targets with ultra-relativisticintensity sub-5-fs laser pulses. Electrons accelerated to multi-MeV energy with electric fields exceeding the TV/m range and dependence on the laser waveform (carrier-envelope phase) were observed.
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  • Resultat 1-5 av 5

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