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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. Ichiguchi ¹, 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 $q_0$ is much larger than $q_{min}$, where $q_0(q_{min})$ 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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