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November 8–12, 2025
Washington, DC|Washington Hilton
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NextEra and Google ink a deal to restart Duane Arnold
A day anticipated by many across the nuclear community has finally arrived: NextEra Energy has officially announced its plans to restart Iowa’s only nuclear power plant, the Duane Arnold Energy Center.
J. Nazon, E. Brun, F. Durut, M. Theobald, O. Legaie
Fusion Science and Technology | Volume 59 | Number 1 | January 2011 | Pages 139-147
Technical Paper | Nineteenth Target Fabrication Meeting | doi.org/10.13182/FST11-A11516
Articles are hosted by Taylor and Francis Online.
In order to decrease the wall absorption of hohlraums during the laser-matter interaction encountered in X-ray indirect-drive inertial confinement fusion, a thick layer of depleted uranium (DU) and gold alloy can be deposited on the inner surface of the hohlraums. Such a coating can be achieved by sputtering simultaneously DU and gold directly into the hohlraums. This technique is called "moulding PVD." In order to validate the moulding PVD technique, Au/Mo cocktail layers were deposited on glass substrates by simultaneous multitarget sputtering. Molybdenum is used for deposition of cocktail alloys since it shows the same sputtering yields as uranium. Au/Mo cocktail layers can be easily grown on glass substrates at any desired composition and controlled thickness by optimizing the deposition parameters. A major issue of DU deposition is its rapid delamination in contact with water, air, or hydrogen. To protect the DU/Au alloy, a thin coating of dense gold is sputtered on the DU alloy. Dense and low-stress gold thin films deposited on glass substrates have been achieved by optimization of processing parameters. The effect of such a coating has been quantified thanks to the study of praseodymium oxidation (which is more sensitive to delamination than DU). A gold coating thickness of 0.2 m thoroughly decreases the oxidation rate of praseodymium in contact with air.