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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.
P. A. Bagryansky, A. D. Beklemishev, E. I. Soldatkina (19P46)
Fusion Science and Technology | Volume 51 | Number 2 | February 2007 | Pages 340-342
Technical Paper | Open Magnetic Systems for Plasma Confinement | doi.org/10.13182/FST07-A1395
Articles are hosted by Taylor and Francis Online.
One of the most important subjects of the GDT research program is MHD-stability and transversal transport of high pressure two-component plasma. Positive influence of radial electric field on the plasma confinement was demonstrated in previous experiments on the GDT in regimes without any special MHD stabilizers. In recent experiments it was observed that stable plasma confinement always corresponds to intermittent distribution of biasing potential on limiters and plasma dumps. It was shown that enhancement of plasma confinement time corresponds to the radial electric field in the range of 15-40 V/cm and one induces the sheared plasma rotation. Regime with grounding of all radial electrodes was typically unstable with plasma confinement time two times lower than gas dynamic flow time. Therefore sheared rotation can stabilize MHD modes of high two-component plasma in the GDT experiment. It is also shown that contact between plasma and radial electrodes is essential but can not completely provide MHD stability in GDT.Measurements using special combined probe were carried out to study fluctuation induced transversal transport and allowed to conclude that cross field transport is negligible and does not play essential role in regimes with sheared plasma rotation.