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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.
Emilio Franconi
Fusion Science and Technology | Volume 6 | Number 2 | September 1984 | Pages 414-419
Technical Paper | Selected papers from the Ninth International Vacuum Congress and the Fifth International Conference on Solid Surfaces (Madrid, Spain, September 26-October 1, 1983) | doi.org/10.13182/FST84-A23215
Articles are hosted by Taylor and Francis Online.
Transmission of microwave radiation at the lower hybrid frequency may induce multipactor breakdown in the coupling structure of a tokamak machine. To increase the R.F. power throughput to a plasma, secondary electron emission on the waveguide walls and subsequent electron multiplication which cause multipactor breakdown effect must be reduced. In this work measurements of secondary electron yields δ of two kinds of coatings (graphite, TiC) on S.S. were performed as a function of primary beam energies (100 eV; 1.1 keV). Also uncoated stainless steel was measured. Results show δ to have a typical energy dependence, with a peak occuring at 200 to 300 eV for normal electron beam incidence. The graphite and TiC coatings after surface treatment give δmax < 1, which allows to reduce multipacting in waveguide.