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Yokoyama, M.; Itoh, K.; Okamura, S.; Matsuoka, K.; Nakajima, N.; Itoh, S.I.; Neilson, G.H.; Zarnstorff, M.C.; Rewoldt, G.
NIFS contributions to 19th IAEA fusion energy conference2002
NIFS contributions to 19th IAEA fusion energy conference2002
AbstractAbstract
[en] The maximum-J (J is the second adiabatic invariant) capability, i.e., the drift reversal capability, is examined in quasi-axisymmetric (QAS) stellarators and quasi-poloidally symmetric (QPS) stellarators as a possible mechanism for turbulent transport suppression. Due to the existence of non-axisymmetry of the magnetic field strength in QAS configurations, a local maximum of J is created to cause the drift reversal. The increase of magnetic shear in finite beta equilibria also has favorable effect in realizing the drift reversal. The radial variation of the uniform magnetic field component plays a crucial role for the drift reversal in a QPS configuration. Thus, the drift reversal capability and its external controllability are demonstrated for QAS and QPS stellarators, by which the impact of magnetic configuration on turbulent transport can be studied in experiments. (author)
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National Inst. for Fusion Science, Toki, Gifu (Japan); 151 p; Nov 2002; p. 134-138; 19. IAEA fusion energy conference; Lyon (France); 14-19 Oct 2002; 17 refs., 4 figs.
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