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Sökning: db:Swepub > Tidskriftsartikel > McKenna P. > Robson L. > Clarke R. J.

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1.
  • Clarke, R. J., et al. (författare)
  • Detection of short lived radioisotopes as a fast diagnostic for intense laser-solid interactions
  • 2006
  • Ingår i: Applied Physics Letters. - American Institute of Physics. - 0003-6951. ; 89:14
  • Tidskriftsartikel (refereegranskat)abstract
    • As a diagnostic of high-intensity laser interactions (> 10(19) W cm(-2)), the detection of radioactive isotopes is regularly used for the characterization of proton, neutron, ion, and photon beams. This involves sample removal from the interaction chamber and time consuming post shot analysis using NaI coincidence counting or Ge detectors. This letter describes the use of in situ detectors to measure laser-driven (p,n) reactions in Al-27 as an almost real-time diagnostic for proton acceleration. The produced Si-27 isotope decays with a 4.16 s half-life by the predominantly beta+ emission, producing a strong 511 keV annihilation peak. (c) 2006 American Institute of Physics.
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. - American Physical Society. - 0031-9007. ; 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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