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September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Fusion Science and Technology
July 2025
Latest News
Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
K. C. Chen, A. Q. Nguyen, H. Huang, S. A. Eddinger, A. Nikroo
Fusion Science and Technology | Volume 55 | Number 4 | May 2009 | Pages 429-437
Technical Paper | Eighteenth Target Fabrication Specialists' Meeting | doi.org/10.13182/FST09-A7422
Articles are hosted by Taylor and Francis Online.
A germanium-doped CH capsule is one of the capsule designs for the National Ignition Facility. Eight batches were made to evaluate yields and reproducibility for production. When larger batches (more than 20 capsules) were made, numerous nanometer-height domes, together with many nanometer-sized seeds and micrometer-sized beads, were observed on the capsule surface. These domes originate from abrasion-induced nanometer-sized seeds. Large batch sizes tend to slide as cohesive groups that enhance friction and abrasion. Limiting the batch size to 15 capsules prevented formation of nanometer-height domes. Roughly 80% of the capsules from 15 capsule batches meets the surface roughness specification, and 85% meets the isolated defect specification. The wall thickness and outer diameter yields, currently at 58% and 28 to 40%, respectively, are affected by variables that will be discussed. The average concentrations of the two Ge-doped layers are 0.77 and 0.50 at.%, with standard deviations of 0.15 at.%. The overall Ge-doping yield, with both layers within the most recent tolerance specification of ±0.2 at.%, is 20%. The best overall yields of 15 shell batches are currently 40 to 55%. The yield-limiting factors are wall-thickness accuracy and high mid-mode in outer surface power spectra.