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2025 ANS Winter Conference & Expo
November 8–12, 2025
Washington, DC|Washington Hilton
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Fusion Science and Technology
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Nuclear News 40 Under 40—2025
Last year, we proudly launched the inaugural Nuclear News 40 Under 40 list to shine a spotlight on the exceptional young professionals driving the nuclear sector forward as the nuclear community faces a dramatic generational shift. We weren’t sure how a second list would go over, but once again, our members resoundingly answered the call, confirming what we already knew: The nuclear community is bursting with vision, talent, and extraordinary dedication.
G. Motojima, H. Okada, K. Y. Watanabe, Y. Nakamura, F. Sano, K. Nagasaki, T. Mizuuchi, S. Kobayashi, K. Kondo, S. Yamamoto, Y. Suzuki, K. Hanatani, Y. Torii, M. Kaneko, H. Arimoto, H. Yamazaki, S. Watanabe, T. Tsuji, H. Nakamura, H. Kitagawa, H. Yabutani, S. Fujikawa, M. Uno
Fusion Science and Technology | Volume 51 | Number 1 | January 2007 | Pages 122-128
Technical Paper | Stellarators | doi.org/10.13182/FST07-A1293
Articles are hosted by Taylor and Francis Online.
Toroidal current has been studied in electron cyclotron heating (ECH) and ECH + neutral beam injection (NBI) plasmas on Heliotron J by controlling the bumpy field component. In the ECH plasma with high density, the toroidal current increases from 0.3 to 1.5 kA when B04/B00 is increased from 0.01 to 0.15, where B04 and B00 are the bumpy field and the uniform field components, respectively. The observed toroidal current is qualitatively in good agreement with neoclassical calculation results without radial electric field except for a low bumpy configuration case at low density. If the radial electric field is responsible for the deviation in the low bumpiness case, the central electric potential is estimated to be ~3 to 5 kV. The dependence of the net toroidal current on the bumpiness has also been observed in the ECH + NBI plasma. An estimation of the Ohkawa current has been attempted.
