Arithmetic reconstruction tomography of self-emission x-ray images of the imploded core plasmas at National Ignition Facility
ORAL
Abstract
To achieve density and temperature required for the thermonuclear ignition, capsules of inertial confinement fusion targets have to be compressed with keeping good spherical symmetry. Due to axisymmetric geometry of the targets (a spherical capsule located in the center of a cylindrical hohlraum), non-uniformity of the x-ray drive is usually dominated by axisymmetric modes. However, x-ray core images observed on the hohlraum axis often show azimuthal perturbation caused by the diagnostic holes, the fuel filling tube, or limited number of the beam-spots on the hohlraum wall. To reduce the non-uniformities and improve the volumetric compression, it is crucial to quantify deformation of the core-fuel boundary in a three-dimensional manner. We performed an arithmetic reconstruction tomography (ART) of the x-ray images obtained from two orthogonal directions and demonstrated capability to track deformation of the gas-fuel boundary including azimuthal perturbation.
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Authors
Nobuhiko Izumi
Lawrence Livermore National Laboratory
L.R. Benedetti
Lawrence Livermore National Laboratory
Charles Cerjan
Lawrence Livermore National Laboratory
J. Edwards
Lawrence Livermore National Laboratory
S. Glenn
Lawrence Livermore National Laboratory
S. Glenzer
Lawrence Livermore National Laboratory, LLNL
O.L. Landen
Lawrence Livermore National Laboratory, LLNL
P.T. Springer
Lawrence Livermore National Laboratory, LLNL
R.P.J. Town
Lawrence Livermore National Laboratory, LLNL
A.J. Mackinnon
Lawrence Livermore National Library, Lawrence Livermore National Laboratory
