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Träfflista för sökning "WFRF:(Neely G. G.) ;pers:(Evans R. G.)"

Sökning: WFRF:(Neely G. G.) > Evans R. G.

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1.
  • McKenna, P., et al. (författare)
  • Effects of front surface plasma expansion on proton acceleration in ultraintense laser irradiation of foil targets
  • 2008
  • Ingår i: Laser and Particle Beams. - 0263-0346. ; 26:4, s. 591-596
  • Tidskriftsartikel (refereegranskat)abstract
    • The properties of beams of high energy protons accelerated during ultraintense, picosecond laser-irradiation of thin foil targets are investigated as a function of preplasma expansion at the target front surface. Significant enhancement in the maximum proton energy and laser-to-proton energy conversion efficiency is observed at optimum preplasma density gradients due, to self-focusing Of the incident laser pulse. For very long preplasma expansion, the propagating laser pulse is observed to filament, resulting in highly uniform proton beams, but with reduced flux and maximum energy.
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2.
  • McKenna, P., et al. (författare)
  • Lateral electron transport in high-intensity laser-irradiated foils diagnosed by ion emission
  • 2007
  • Ingår i: Physical Review Letters. - 1079-7114. ; 98:14
  • Tidskriftsartikel (refereegranskat)abstract
    • An experimental investigation of lateral electron transport in thin metallic foil targets irradiated by ultraintense (>= 10(19) W/cm(2)) laser pulses is reported. Two-dimensional spatially resolved ion emission measurements are used to quantify electric-field generation resulting from electron transport. The measurement of large electric fields (similar to 0.1 TV/m) millimeters from the laser focus reveals that lateral energy transport continues long after the laser pulse has decayed. Numerical simulations confirm a very strong enhancement of electron density and electric field at the edges of the target.
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