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Träfflista för sökning "WFRF:(Neely G. G.) ;pers:(Wahlström C. G.)"

Sökning: WFRF:(Neely G. G.) > Wahlström C. G.

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1.
  • Yuan, X. H., et al. (författare)
  • Effects of target pre-heating and expansion on terahertz radiation production from intense laser-solid interactions
  • 2014
  • Ingår i: High Power Laser Science and Engineering. - : Cambridge University Press (CUP). - 2095-4719 .- 2052-3289. ; 2
  • Tidskriftsartikel (refereegranskat)abstract
    • The first experimental measurements of intense laser-driven terahertz (THz) radiation from a solid target which is preheated by an intense pulse of laser-accelerated protons is reported. The total energy of the THz radiation is found to decrease by approximately a factor of 2 compared to a cold target reference. This is attributed to an increase in the scale length of the preformed plasma, driven by proton heating, at the front surface of the target, where the THz radiation is generated. The results show the importance of controlling the preplasma scale length for THz production.
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2.
  • Aurand, B., et al. (författare)
  • Manipulation of the spatial distribution of laser-accelerated proton beams by varying the laser intensity distribution
  • 2016
  • Ingår i: Physics of Plasmas. - : AIP Publishing. - 1089-7674 .- 1070-664X. ; 23:2
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on a study of the spatial profile of proton beams produced through target normal sheath acceleration using flat target foils and changing the laser intensity distribution on the target front surface. This is done by either defocusing a single laser pulse or by using a split-pulse setup and irradiating the target with two identical laser pulses with variable spatial separation. The resulting proton beam profile and the energy spectrum are recorded as functions of the focal spot size of the single laser pulse and of the separation between the two pulses. A shaping of the resulting proton beam profile, related to both an increase in flux of low-energy protons in the target normal direction and a decrease in their divergence, in one or two dimensions, is observed. The results are explained by simple modelling of rear surface sheath field expansion, ionization, and projection of the resulting proton beam.
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