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Nuclear Energy Conference & Expo (NECX)
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.
N. Takeuchi, T. Seki, K. Saito, T. Watari, R. Kumazawa, T. Mutoh, Y. Torii, G. Nomura, A. Kato, F. Shimpo, Y. Takase, H. Kasahara, T. Taniguchi, H. Wada, N. Kasuya, K. Yamagishi, C. P. Moeller, M. Saigusa, Z. Yanping
Fusion Science and Technology | Volume 48 | Number 3 | November 2005 | Pages 1267-1284
Technical Paper | doi.org/10.13182/FST05-A1076
Articles are hosted by Taylor and Francis Online.
A novel stacked combline antenna was fabricated for driving plasma current in order to control the rotational transform profile in the Large Helical Device. The antenna has ten elements facilitating excitation of fast-wave traveling in the toroidal direction.Each antenna element has an electrical length of a half-wavelength and is supported at the midpoint from the back plate by a metallic block. Such an antenna has two modes: even and odd. A mixed excitation of these modes will reduce the current drive efficiency. The electrical properties of this antenna were studied in an attempt to find ways of exciting a traveling wave of pure even mode. A matching section was used in combination and proved to be a good measure to improve the directionality over that of a bare combline antenna. It is confirmed in this paper that the fabricated real antenna has fairly good even-mode purity keeping the odd-mode intensity at a tolerable level. An antenna with insulating supports instead of the metallic supports is also examined, and it is found that even-mode purity is further improved. For practical uses, an entire system including impedance matching and power circulation is proposed, and sensitivity to a change in plasma loading is analyzed. Finally, the power-handling capability is discussed including estimations of plasma loading and driven current reaching an assertion of consistency with the experimental goal.