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Atlanta, GA|Atlanta Marriott Marquis
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DOE issues new NEPA rule and procedures—and accelerates DOME reactor testing
Meeting a deadline set in President Trump’s May 23 executive order “Reforming Nuclear Reactor Testing at the Department of Energy,” the DOE on June 30 updated information on its National Environmental Policy Act (NEPA) rulemaking and implementation procedures and published on its website an interim final rule that rescinds existing regulations alongside new implementing procedures.
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.