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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.
T. Morisaki, M. Shoji, S. Masuzaki, S. Sakakibara, H. Yamada, A. Komori, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 465-470
Chapter 8. Diagnostics | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10832
Articles are hosted by Taylor and Francis Online.
Magnetic flux surface measurements have been carried out in the Large Helical Device (LHD) in the standard magnetic field configuration with toroidal magnetic field strength up to 2.75 T. An electron beam launched with a small electron gun moving across the flux surfaces was detected with a fluorescent screen or a probe array. Nested surfaces could clearly be visualized with both methods. Even the stochastic region was detected. In the experiment, unfavorable m/n = 1/1 and 2/1 magnetic islands were discovered near the last closed flux surface, where m and n are poloidal and toroidal mode numbers, respectively. There is a possibility that the source of the error field, in the low magnetic field of 0.0875 T, is terrestrial magnetism. On the other hand, in the standard magnetic field of 2.75 T, the main source of the error field is thought to be ferromagnetic materials near the torus of LHD. Fortunately, it was demonstrated that such magnetic islands can be reduced or eliminated by applying a correction field with some perturbation coils.