TITLE

Transport of energy by ultraintense laser-generated electrons in nail-wire targets

AUTHOR(S)
Ma, T.; Key, M. H.; Mason, R. J.; Akli, K. U.; Daskalova, R. L.; Freeman, R. R.; Green, J. S.; Highbarger, K.; Jaanimagi, P. A.; King, J. A.; Lancaster, K. L.; Hatchett, S. P.; Mackinnon, A. J.; MacPhee, A. G.; Norreys, P. A.; Patel, P. K.; Stephens, R. B.; Theobald, W.; Van Woerkom, L. D.; Wei, M. S.
PUB. DATE
November 2009
SOURCE
Physics of Plasmas;Nov2009, Vol. 16 Issue 11, p112702
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Nail-wire targets (20 μm diameter copper wires with 80 μm hemispherical head) were used to investigate energy transport by relativistic fast electrons generated in intense laser-plasma interactions. The targets were irradiated using the 300 J, 1 ps, and 2×1020 W·cm-2 Vulcan laser at the Rutherford Appleton Laboratory. A spherically bent crystal imager, a highly ordered pyrolytic graphite spectrometer, and single photon counting charge-coupled device gave absolute Cu Kα measurements. Results show a concentration of energy deposition in the head and an approximately exponential fall-off along the wire with about 60 μm 1/e decay length due to resistive inhibition. The coupling efficiency to the wire was 3.3±1.7% with an average hot electron temperature of 620±125 keV. Extreme ultraviolet images (68 and 256 eV) indicate additional heating of a thin surface layer of the wire. Modeling using the hybrid E-PLAS code has been compared with the experimental data, showing evidence of resistive heating, magnetic trapping, and surface transport.
ACCESSION #
45515265

 

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