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September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Fusion Science and Technology
July 2025
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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.
G. Tsotridis, I. Goded
Fusion Science and Technology | Volume 26 | Number 1 | August 1994 | Pages 7-16
Technical Paper | First-Wall Technology | doi.org/10.13182/FST94-A30297
Articles are hosted by Taylor and Francis Online.
Plasma-facing components in tokamak-type fusion reactors are subjected to intense heat loads during plasma disruptions. The influence of high heat fluxes on the depths of heat-affected zones on Type 316 stainless steel with different sulfur impurities was studied for a range of energy densities and disruption times. It was demonstrated in small beam simulation experiments that under certain conditions, impurities through their effect on surface tension create convective flows, hence exercising a determining influence on the flow intensities and the resulting depth of molten layers. When a CO2 laser is used as a heat source, the role of impurities diminishes, due to high temperatures on the surface of the specimens, and all types of stainless steel behave like pure material. However, by using an alternative heat source that produces lower surface temperatures, e.g., tungsten inert gas, the stainless steel containing high sulfur produces much higher melting zone thicknesses compared with the low sulfur steels. Comparison between experimental results and existing theoretical predictions reveal significant differences in the depths of the melt layers.