Effect of Magnetic Axis Shift on Neoclassical Transport in Helical Torus
H. Sanuki and J. Todoroki
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan Neoclassical transport for large helical device (LHD) type of configurations is studied by solving the bounce-averaged kinetic equation. Numerical code employed in the present paper (CHD1) is much faster and more efficient than existing transport codes. Effects of the magnetic axis shift on the mono-energetic transport coefficients are studied in detail for the LHD type of configurations, revealing that a strong inward shift of the magnetic axis can reduce remarkably the neoclassical ripple transport. Transport coefficients in case of the Maxwellian energy distributions are also evaluated.
References
[1] J. Todoroki and H. Sanuki, in Procceedings of the International Conference on Plasma Physics
(ICPP96) in Nagaya(1996), pp298-301. [2] H. Sanuki, J. Todoroki and T. Nakagawa, J. Accel. Plasma Res. Vol.5, No.1(2000) 53. [3] Sanuki H. , Todoroki J. and Nakagawa T. , J. Plasma Fusion Res. Sries, Vol.4(2001)403.
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