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We report first direct experimental evidence of interspecies ion separationin direct-drive ICF experiments performed at the OMEGA laser facility viaspectrally, temporally and spatially resolved imaging x-ray-spectroscopy data[S. C. Hsu et al., EPL 115, 65001 (2016)]. These experiments were designedbased on the expectation that interspecies ion thermo-diffusion would bestrongest for species with large mass and charge difference. The targets werespherical plastic shells filled with D2 and a trace amount of Ar (0.1% or 1% byatom). Ar K-shell spectral features were observed primarily between the time offirst-shock convergence and slightly before neutron bang time, using a time-and space-integrated spectrometer, a streaked crystal spectrometer, and twogated multi-monochromatic x-ray imagers fielded along quasi-orthogonal lines ofsight. Detailed spectroscopic analyses of spatially resolved Ar K-shell linesreveal deviation from the initial 1% Ar gas fill and show both Ar-concentrationenhancement and depletion at different times and radial positions of theimplosion. The experimental results are interpreted with radiation-hydrodynamicsimulations that include recently implemented, first-principles models ofinterspecies ion diffusion. The experimentally inferred Ar-atom-fractionprofiles agree reasonably with calculated profiles associated with the incomingand rebounding first shock.

Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy