American Nuclear Society

Home / Store / Journals / Electronic Articles / Fusion Science and Technology / Volume 63 / Number 2 / Pages 208-212

Thin Oxides as a Copper Diffusion Barrier for NIF Beryllium Ablator Capsules

K. P. Youngblood, H. Huang, H. W. Xu, J. Hayes, K. A. Moreno, J. J. Wu, A. Nikroo, C. A. Alford, A. V. Hamza, S. O. Kucheyev, Y. M. Wang, K. J. Wu

Fusion Science and Technology / Volume 63 / Number 2 / Pages 208-212

March 2013


Member Price:$27.00
Member Savings:$3.00

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.

Questions or comments about the site? Contact the ANS Webmaster.