Gas-filled hohlraum experiments at the National Ignition Facilitya)
PHYSICS OF PLASMAS(2006)
Abstract
Experiments done at the National Ignition Facility laser [J. A. Paisner, E. M. Campbell, and W. Hogan, Fusion Technol. 26, 755 (1994)] using gas-filled hohlraums demonstrate a key ignition design feature, i.e., using plasma pressure from a gas fill to tamp the hohlraum-wall expansion for the duration of the laser pulse. Moreover, our understanding of hohlraum energetics and the ability to predict the hohlraum soft-x-ray drive has been validated in ignition-relevant conditions. Finally, the laser reflectivity from stimulated Raman scattering in the fill plasma, a key threat to hohlraum performance, is shown to be suppressed by choosing a design with a sufficiently high ratio of electron temperature to density. (c) 2006 American Institute of Physics.
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Key words
design,spectrum,electromagnetic radiation,light transmission,raman effect,rayleigh scattering,raman scattering,reflectivity,plasma pressure,energy balance,boundary layer,electron temperature,stimulated brillouin scattering,lasers
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