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M. Wakatani, Y. Nakamura, K. Kondo,
M. Nakasuga, S. Besshou
Graduate School of Energy Science, Kyoto University, Uji, Japan
T. Obiki, F. Sano, K. Hanatani, T. Mizuuchi,
H. Okada, K. Nagasaki, N. Inoue
Institute of Advanced Energy, Kyoto University, Uji, Japan
National Institute for Fusion Science, Toki, Japan
Abstract. Optimization studies have been done for the helical-axis heliotron
configuration. One purpose is to find a configuration suitable for
experimental studies of basic properties of helical-axis heliotron. In this
study, the role of the bumpy field component (toroidal mirror ratio) on MHD
stability and neoclassical confinement for this type of configuration is
examined. The physical mechanism of the improvement of the neoclassical
transport by controlling bumpy field component is clarified. Physics design
and the current status of the new helical-axis heliotron device (Heliotron
J) are also described.
IAEA 2001
