Improving the Reproducibility of the Radial Argon Concentration in Beryllium Shells

Sputter coating of beryllium on spherical mandrels has been used at Lawrence Livermore National Laboratory and at General Atomics to produce graded, copper doped beryllium shells. While these coatings have consistent microstructure and acceptable void content, different coaters produced different re...

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Bibliographic Details
Published in:Fusion science and technology 2011-01, Vol.59 (1), p.126-132
Main Authors: Youngblood, K., Alford, C., Bhandarkar, S., Hayes, J., Moreno, K., Nikroo, A., Xu, H.
Format: Article
Language:English
Subjects:
beryllium shells
beryllium sputter coating
ENGINEERING
NIF target
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Summary:Sputter coating of beryllium on spherical mandrels has been used at Lawrence Livermore National Laboratory and at General Atomics to produce graded, copper doped beryllium shells. While these coatings have consistent microstructure and acceptable void content, different coaters produced different results with respect to argon implantation. Each individual system met the requirements for argon implantation, but the deviation from one system to another and from run to run exceeded the variability requirements as specified by the National Ignition Facility target design requirements. We redesigned the fixturing within one system to improve reproducibility. Then, we reconfigured the coaters so that the vertical and lateral alignments of the shells under the gun varied
ISSN:1536-1055
1943-7641
DOI:10.13182/FST10-3692