(THP2/08) Improved Stability Due to Local Pressure Flattening in
Stellarators
M. Wakatani1), K. Ichiguchi2),
T. Unemura1), T. Tatsuno3),
B. A. Carreras4)
1) Graduate School of Energy Science, Kyoto University,
Gokasho, Uji, Japan 611-0011
2) National Institute for Fusion Science, Oroshi-cho 322-6, Toki,
Japan 509-5292
3) Graduate School of Frontier Science, University of Tokyo, Tokyo,
Japan 113-8656
4) Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
Abstract. It is demonstrated that the stability of low n pressure
gradient driven modes is improved by introducing local pressure flattening
at low order rational surfaces in LHD (Large Helical Device) with the inward
magnetic axis shift of 25cm, where n is the toroidal mode number.
IAEA 2001
