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2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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Latest News
A wave of new U.S.-U.K. deals ahead of Trump’s state visit
President Trump will arrive in the United Kingdom this week for a state visit that promises to include the usual pomp and ceremony alongside the signing of a landmark new agreement on U.S.-U.K. nuclear collaboration.
Masaru Takagi, Robert Cook, Barry McQuillan, Fred Elsner, Richard Stephens, Abbas Nikroo, Jane Gibson, Sally Paguio
Fusion Science and Technology | Volume 41 | Number 3 | May 2002 | Pages 278-285
Technical Paper | Fourteenth Target Fabrication Specialists' Meeting | doi.org/10.13182/FST41-278
Articles are hosted by Taylor and Francis Online.
Recently, we developed a new method for making spherical poly(α-methylstyrene) (PαMS) mandrels. The process utilizes a small amount (<0.1wt%) of high-molecular-weight poly(acrylic acid) (PAA) in the suspending medium, which substantially increases the interfacial tension during curing relative to methods using poly(vinyl alcohol) (PVA) and yields extremely round capsules. The PAA is also beneficial for centering of the core water, leading to exceptionally concentric capsules. However, fully cured capsules made by this method displayed a significant level of high frequency surface debris that became especially problematic when the mandrels were subsequently overcoated. To solve this problem we examined the use of PAA in conjunction with PVA in order to reduce these surface features, and explored numerous variations of concentration and timing of the PVA addition. The optimum conditions were found to be initial use of PAA for centering and symmetry of the mandrels, followed by removal of the PAA medium, washing of the mandrels with water, and finally transfer to PVA solution for completion of the curing cycle. Glow discharge polymer shells made from these mandrels have power spectra that meet the ignition capsule design requirements.