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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.
Jiaqi Dong, Elena Montalvo, Rodolfo Carrera, Marshall N. Rosenbluth
Fusion Science and Technology | Volume 23 | Number 1 | January 1993 | Pages 42-50
Technical Paper | Plasma Engineering | doi.org/10.13182/FST93-A30118
Articles are hosted by Taylor and Francis Online.
The plasma vertical stability in a single-turn tokamak configuration is analyzed. The stabilization effects of the vacuum vessel and poloidal field magnet are studied numerically with rigid and magnetohydrodynamic models. An analytic mode dispersion relation is derived to estimate the effect of the single-turn toroidal field magnet on the plasma vertical stability. The typical growth time of the mode is found to be >1 s. The stability advantages of the single-turn configuration for a high-current tokamak plasma and the differences among the three models used are discussed. A single-turn tokamak configuration seems to be appropriate for a fusion ignition experiment in that it simplifies plasma control and makes feasible the control of high-current, elongated tokamak ignition plasma.
