Journal
PHYSICS OF PLASMAS
Volume 19, Issue 8, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.4743017
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Funding
- DOE/NLUF [DE-FG52-09NA29042]
- Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
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A spectroscopic method has been developed to extract the three-dimentional spatial structure (i.e., spatial distribution of electron temperature and density) of inertial confinement fusion implosion cores based on the analysis of space-resolved spectra from a tracer element recorded along three quasi-orthogonal lines of sight. We discuss a spectral model that computes space-resolved spectra for a given spatial structure. This model is then combined with a multi-objective search and optimization technique driven by a Pareto genetic algorithm to perform the inversion and to extract the spatial structure of the implosion core from a simultaneous and self-consistent analysis of a set of space-resolved spectra. This method is investigated with a series of synthetic data test cases to explore its reliability, requirements, and limitations. We have found a constraint parameter P-const such that the method is robust and the extracted spatial structure is reliable when P-const > 1. The idea of polychromatic tomography is general and has potential to extract the spatial structure high energy-density plasmas. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4743017]
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