Investigation of a polychromatic tomography method for the extraction of the three-dimensional spatial structure of implosion core plasmas
- Physics Department, University of Nevada, Reno, Nevada 89557 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- Laboratory for Laser Energetics, University of Rochester, New York 14623 (United States)
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{sub const} such that the method is robust and the extracted spatial structure is reliable when P{sub const}> 1. The idea of polychromatic tomography is general and has potential to extract the spatial structure of other laboratory high energy-density plasmas.
- OSTI ID:
- 22086051
- Journal Information:
- Physics of Plasmas, Vol. 19, Issue 8; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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