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The MHD beta limit of reversed shear equlibria, due to n=1, 2, and ballooning modes, is investigated for peak pressure profiles, consistent with those occurring when the internal transport barrier is established in JET optimized shear discharges. Higher beta(n) can be reached with the control of the minimum q value and a conducting wall can further improve the stable domain. The n=2 mode plays an insignificant role, unless the conducting wall improves the n=1 stability when the shear reversal is large. Increasing the amount of shear reversal generally improves MHD stability and the effect is stronger for n=2 mode. Beta increases with normalized current but B(n) is only weakly affected.

Additional information

Authors: KWON O J, UKAEA Fusion, UKAEA, Abingdon (GB);HENDER T C, UKAEA Fusion, UKAEA, Abingdon (GB);HUYSMANS G T A, Department of Physics, Taegu University (KR)
Bibliographic Reference: Article: JET-P(98)26
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