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Comparison of genetic-algorithm and emissivity-ratio analyses of image data from OMEGA implosion cores

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10 Author(s)
Nagayama, T. ; Department of Physics, University of Nevada, Reno, Nevada 89557, USA ; Mancini, R.C. ; Florido, R. ; Tommasini, R.
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Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2966370 

Detailed analysis of x-ray narrow-band images from argon-doped deuterium-filled inertial confinement fusion implosion experiments yields information about the temperature spatial structure in the core at the collapse of the implosion. We discuss the analysis of direct-drive implosion experiments at OMEGA, in which multiple narrow-band images were recorded with a multimonochromatic x-ray imaging instrument. The temperature spatial structure is investigated by using the sensitivity of the Lyβ/Heβ line emissivity ratio to the temperature. Three analysis methods that consider the argon Heβ and Lyβ image data are discussed and the results compared. The methods are based on a ratio of image intensities, ratio of Abel-inverted emissivities, and a search and reconstruction technique driven by a Pareto genetic algorithm.

Published in:

Review of Scientific Instruments  (Volume:79 ,  Issue: 10 )

Date of Publication:

Oct 2008

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