Abstract
In Inertial Confinement Fusion Experiments at the National Ignition Facility, time-resolved x-ray images of the central hot spot are captured to diagnose the compression, symmetry and relative amount of mixed material. In this work, we extract bright localized mix features from the images to (1) obtain a more accurate measurement of the hot spot size (compression), (2) match the feature to known capsule defects, and (3) estimate the internal hot spot flow velocity. A new extraction tool was developed that uses derivatives of the size of the hot spot vs contour level to automatically pick out the localized mix features. The size of the “clean” hot spot is larger than that measured with the traditional hot spot analysis routines by 10–30 %. Additionally, since the images are time-resolved, the velocities of the localized mix features can be measured and give an indication of internal flows of the hot spot.
Published Version
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