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Träfflista för sökning "WFRF:(Dromey B.) srt2:(2009)"

Search: WFRF:(Dromey B.) > (2009)

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1.
  • Pirozhkov, A. S., et al. (author)
  • Diagnostic of laser contrast using target reflectivity
  • 2009
  • In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 94:24
  • Journal article (peer-reviewed)abstract
    • Using three different laser systems, we demonstrate a convenient and simple plasma based diagnostic of the contrast of high-power short-pulse lasers. The technique is based on measuring the specular reflectivity from a solid target. The reflectivity remains high even at relativistic intensities above 10(19) W/cm(2) in the case of a high-contrast prepulse-free laser. On the contrary, the specular reflectivity drops with increasing intensities in the case of systems with insufficient contrast due to beam breakup and increased absorption caused by preplasma.
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2.
  • Robinson, A. P. L., et al. (author)
  • Spectral modification of laser-accelerated proton beams by self-generated magnetic fields
  • 2009
  • In: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 11
  • Journal article (peer-reviewed)abstract
    • Target normal measurements of proton energy spectra from ultrathin (50-200 nm) planar foil targets irradiated by 10(19) W cm(-2) 40 fs laser pulses exhibit broad maxima that are not present in the energy spectra from micron thickness targets (6 mu m). The proton flux in the peak is considerably greater than the proton flux observed in the same energy range in thicker targets. Numerical modelling of the experiment indicates that this spectral modification in thin targets is caused by magnetic fields that grow at the rear of the target during the laser-target interaction.
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