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(THP1/03) Ideal and Resistive Interchange Instabilities in Negative Shear Tokamaks and Currentless Heliotron Plasmas

(This paper was rapporteured in lecture TH2/2)

M. Furukawa, K. Ichiguchi¹, Y. Nakamura, W. Wakatani

Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Japan 611-0011
¹ National Institute for Fusion Science, Oroshi, Toki, Japan 509-5292

Abstract.  For tokamaks the ideal localized interchange mode does not play a role for q (safety) factor > 1 in the whole plasma region, while it becomes unstable in the edge region with a magnetic hill in heliotron plasmas. However, for negative shear tokamaks the resistive localized interchange mode becomes unstable when q₀ is much larger than q_min, where q₀(q_min) is a central (minimum) q value. It is also shown that the ideal and resistive non-resonant global interchange modes appear easily in the central region of heliotron and in the negative shear tokamak, which are similar to the infernal mode in the low-shear tokamak.

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