26 September 2017 X-ray penumbral imaging diagnostic developments at the National Ignition Facility
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Abstract
X-ray penumbral imaging has been successfully fielded on a variety of inertial confinement fusion (ICF) capsule implosion experiments on the National Ignition Facility (NIF). We have demonstrated sub-5 μm resolution imaging of stagnated plasma cores (hot spots) at x-ray energies from 6 to 30 keV. These measurements are crucial for improving our understanding of the hot deuterium-tritium fuel assembly, which can be affected by various mechanisms, including complex 3-D perturbations caused by the support tent, fill tube or capsule surface roughness. Here we present the progress on several approaches to improve x-ray penumbral imaging experiments on the NIF. We will discuss experimental setups that include penumbral imaging from multiple lines-of-sight, target mounted penumbral apertures and variably filtered penumbral images. Such setups will improve the signal-to-noise ratio and the spatial imaging resolution, with the goal of enabling spatially resolved measurements of the hot spot electron temperature and material mix in ICF implosions.
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B. Bachmann, H. Abu-Shawareb, N. Alexander, J. Ayers, C. G. Bailey, P. Bell, L. R. Benedetti, D. Bradley, G. Collins, L. Divol, T. Döppner, S. Felker, J. Field, A. Forsman, J. D. Galbraith, C. M. Hardy, T. Hilsabeck, N. Izumi, C. Jarrot, J. Kilkenny, S. Kramer, O. L. Landen, T. Ma, A. MacPhee, N. Masters, S. R. Nagel, A. Pak, P. Patel, L. A. Pickworth, J. E. Ralph, C. Reed, J. R. Rygg, D. B. Thorn, "X-ray penumbral imaging diagnostic developments at the National Ignition Facility", Proc. SPIE 10390, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion VI, 103900B (26 September 2017); doi: 10.1117/12.2274611; https://doi.org/10.1117/12.2274611
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