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

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