CORE TEMPERATURE AND DENSITY PROFILES FROM MULTISPECTRAL IMAGING OF ICF PLASMAS

摘要

We have developed a multiple monochromatic x-ray imaging diagnostic that uses an array of pinhales coupled to a multilayer Bragg mirror, and we have used this diagnostic to obtain unique multispectral imaging data of inertial-confinement fusion implosion plasmas. Argon dopants in the fuel allow emission images to be obtained in the Ar He-β and Ly-β spectral bands, and these images provide information on core temperature and density profiles. We have analyzed these images to obtain quasi-three-dimensional maps of electron temperature and scaled electron density within the core for several cases of drive symmetry, and we observed a two-lobed structure evolving for increasingly prolate-asymmetric drive. This structure is completely masked in broad-band images at similar x-ray energies. Future work will concentrate on hydrodynamics simulations for comparison with the data.