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Fusion Science and Technology
Latest News
Framatome signs contracts with Sizewell C
French nuclear developer Framatome is slated to deliver key equipment for Sizewell C Ltd.’s two large reactors planned for the United Kingdom’s Suffolk coast.
The agreement, reportedly worth multiple billions of euros, was announced this week and will involve Framatome from the design phase until commissioning. The company also agreed to a long-term fuel supply deal. Framatome is 80.5 percent owned by France’s EDF and 19.5 percent owned by Mitsubishi Heavy Industries.
K. C. Chen, A. Nikroo
Fusion Science and Technology | Volume 49 | Number 4 | May 2006 | Pages 721-727
Technical Paper | Target Fabrication | doi.org/10.13182/FST06-A1192
Articles are hosted by Taylor and Francis Online.
The surface of vapor-deposited polyimide (PI) coating onto a mechanically agitated mandrel has always been rougher than the NIF standard. The roughness has been attributed to various sources, including defects and contamination on substrate mandrels, abraded damage from mechanical agitation, or off-stoichiometric compositions.At near-stoichiometric deposition conditions, the surface roughness is primarily due to damages from collisions. Using a plastic mesh container with a suitable opening size and synchronized gentle tapping, we have greatly improved the surface quality of 1 mm diameter 4-5 m thick polyimide shells. The plastic mesh improves the surface quality by limiting shell movements and reducing the impact force and number of collisions between the shells during coating. The surface smoothness of the as-deposited polyamic acid coating meets the NIF surface smoothness standard. Appropriate pressure and heat profiles are used to remove the mandrel and convert the thin polyamic acid coating into polyimide and preserve the surface smoothness. The AFM spheremaps, patch scans and WYKO optical interferometer measurement showed a root-mean-square smoothness ranging 3-5 nm.