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Study of fast-electron transport in laser-illuminated spherical targets

Phys. Plasmas 16, 102703 (2009); doi:10.1063/1.3246007

Published 15 October 2009

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B. Yaakobi, O. V. Gotchev, R. Betti, and C. Stoeckl
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623-1299, USA
The transport and scattering of fast electrons created by the two-plasmon-decay instability are studied by comparing the hard x-ray signal from two identically irradiated targets: a 1-mm-diam solid Cu sphere and a 1-mm-diam solid CH sphere, both coated with a 15  µm layer of CH. Comparing the results with Monte Carlo code simulations shows the role of scattering in the higher-Z Cu target. We find evidence that the fast electrons are created with a wide angular divergence and that higher-energy electrons transmitted through the target are reflected back into the target. Because of scattering, the fast-electron energy deposition (preheat) in Cu is about half that in CH, namely, ~0.15% of the laser energy for Cu as compared with ~0.30% for CH. Embedded high-Z layers in imploding fusion targets, because of the scattering, could provide protection against preheat. ©2009 American Institute of Physics
History: Received 21 July 2009; accepted 21 September 2009; published 15 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/102703/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Py
    Plasma macroinstabilities (hydromagnetic)
  • 52.80.Qj
    Explosions; exploding wires (electrical discharges)
  • 52.25.Fi
    Plasma transport properties
  • 52.65.Pp
    Monte Carlo methods (plasma simulation)
  • 52.57.Fg
    Implosion symmetry and hydrodynamic instability for laser ICF
  • 52.50.Jm
    Plasma production and heating by laser beams
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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AIP is a member of CrossRef AIP

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