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(THP2/03) Is the Mercier Criterion Relevant to Stellarator Stability?

B. A. Carreras¹⁾, V. E. Lynch¹⁾, K. Ichiguchi²⁾, M. Wakatani³⁾, T. Tatsuno^4)
 
1) Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A.
²⁾ National Institute for Fusion Science, Toki, Japan
³⁾ Graduate School of Energy Science, Kyoto University, Kyoto, Japan
⁴⁾ Graduate School of Frontier Science, Tokyo University, Tokyo, Japan

Abstract.  Local flattening of the pressure profile at the resonant surfaces may significantly change the stellarator stability properties. This flattening may be an intrinsic consequence of the three-dimensional nature of the equilibrium and may invalidate the local stability criteria often used in stellarator design.

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