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Proceedings Paper

Image processing methods for characterizing cryogenic target quality during ice layer formation at the National Ignition Facility (NIF)
Author(s): Richard R. Leach; John E. Field; Laura Mascio-Kegelmeyer; Bernie Kozioziemski; Tanza Lee; Evan Mapoles; Randy Roberts; Rebecca Dylla-Spears; Tayyab Suratwala
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Paper Abstract

A challenging aspect of preparing cryogenic targets for National Ignition Facility (NIF) ignition experiments is growing a single crystal layer (~ 70 m thick) of solid frozen deuterium-tritium (DT) fuel on the inner surface of a spherical hollow plastic capsule 2 mm in diameter. For the most critical fusion experiments, the layer must be smooth, having uniform thickness, and largely free of isolated defects (e.g. grooves). A single target layer typically takes up to 18 hours to form. X-ray images on 3 orthogonal axes are used to monitor the growth of the crystal and evaluate the quality of the layer. While these methods provide a good indicator of target layer condition, new metrics are currently being developed to take advantage of other properties in the x-ray image, which may give earlier indications of target quality. These properties include symmetry of texture, seed formation, and eigenimage analysis. We describe the approach and associated image processing to evaluate and classify these metrics, whose goal is to improve overall layer production and better quantify the quality of the layer during its growth.

Paper Details

Date Published: 20 February 2013
PDF: 11 pages
Proc. SPIE 8602, High Power Lasers for Fusion Research II, 86020H (20 February 2013); doi: 10.1117/12.2009413
Show Author Affiliations
Richard R. Leach, Lawrence Livermore National Lab. (United States)
John E. Field, Lawrence Livermore National Lab. (United States)
Laura Mascio-Kegelmeyer, Lawrence Livermore National Lab. (United States)
Bernie Kozioziemski, Lawrence Livermore National Lab. (United States)
Tanza Lee, Lawrence Livermore National Lab. (United States)
Evan Mapoles, Lawrence Livermore National Lab. (United States)
Randy Roberts, Lawrence Livermore National Lab. (United States)
Rebecca Dylla-Spears, Lawrence Livermore National Lab. (United States)
Tayyab Suratwala, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 8602:
High Power Lasers for Fusion Research II
Abdul A. S. Awwal, Editor(s)

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