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

Phys. Plasmas 16, 112702 (2009); doi:10.1063/1.3261810

Published 4 November 2009

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T. Ma,1,2 M. H. Key,2 R. J. Mason,3 K. U. Akli,4 R. L. Daskalova,5 R. R. Freeman,5 J. S. Green,6,7 K. Highbarger,5 P. A. Jaanimagi,8 J. A. King,1 K. L. Lancaster,6 S. P. Hatchett,2 A. J. Mackinnon,2 A. G. MacPhee,2 P. A. Norreys,6,7 P. K. Patel,2 R. B. Stephens,4 W. Theobald,8 L. D. Van Woerkom,5 M. S. Wei,1 S. C. Wilks,2 and F. N. Beg1
1Department of Mechanical and Aerospace Engineering, University of California-San Diego, La Jolla, California 92093, USA
2Lawrence Livermore National Laboratory, Livermore, California 94550, USA
3Research Applications Corporation, Los Alamos, New Mexico 87544, USA
4General Atomics, San Diego, California 92186, USA
5College of Mathematical and Physical Sciences, The Ohio State University, Columbus, Ohio 43210, USA
6Central Laser Facility, Rutherford Appleton Laboratory, Didcot OX11 OQX, United Kingdom
7Department of Physics, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BZ, United Kingdom
8Laboratory of Laser Energetics, University of Rochester, Rochester, New York 14623, USA
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 Kalpha 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. ©2009 American Institute of Physics
History: Received 24 June 2009; accepted 19 October 2009; published 4 November 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/112702/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.50.Jm
    Plasma production and heating by laser beams
  • 52.27.Ny
    Relativistic plasmas
  • 52.40.Mj
    Particle beam interactions in plasmas
  • 52.25.Fi
    Plasma transport properties
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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