NIFS-649

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Author(s): K. Ichiguchi, M. Wakatani, T. Unemura, T. Tatsuno and B.A. Carreras Title: Improved Stability due to Local Pressure Flattening in Stellarators Date of publication: Sep. 2000 Key words: IAEA, fusion energy conference, Sorrento Abstract: It is demonstrated that the stability of low n pressure gradient driven modes is improved by introducting local pressure flattening at low order rational surfaces in LHD (Large Helical Device) with the inward magnetic axis shift of 25cm, where n is a toroidal mode number.

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