Thin Oxides as a Cu Diffusion Barrier for NIF Be Ablator Capsules

Journal Article · Fri Mar 01 00:00:00 EST 2013 · Fusion Science and Technology

DOI:https://doi.org/10.13182/FST20-50· OSTI ID:1237524

Youngblood, Kelly P. ^[1]; Huang, H. ^[1]; Xu, H. W. ^[1]; Hayes, J. ^[1]; Moreno, K. A. ^[1]; Wu, J. J. ^[1]; Nikroo, A. ^[1]; Alford, C. A. ^[2]; Hamza, A. V. ^[2]; Kucheyev, S. O. ^[2]; Wang, Y. M. ^[2]; Wu, K. J. ^[2]

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1. General Atomics, San Diego, CA (United States)
2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The NIF point design uses a five-layer capsule to modify the X-ray absorption in order to achieve optimized shock timing. A stepped copper dopant design defines the layer structure. The production of the capsule involves pyrolysis to remove the inner plastic mandrel. Copper atoms diffuse radially and azimuthally throughout the capsule during pyrolysis. This diffusion significantly diminishes the capsule performance during implosion. Thermal and coated oxide barrier layers employed between layers mitigate the diffusion of copper during the mandrel removal process. The copper atoms do not diffuse through this barrier during pyrolysis. A capsule fabrication method that produces a capsule with a thin oxide layer will be discussed.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-07NA27344
• OSTI ID: 1237524
• Report Number(s): LLNL-JRNL-589692
• Journal Information: Fusion Science and Technology, Vol. 63, Issue 2; ISSN 1536-1055
• Publisher: American Nuclear Society
• Country of Publication: United States
• Language: English

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