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Slablike ion temperature gradient driven mode in reversed shear tokamaks

Idomura, Yasuhiro  ; Tokuda, Shinji; Kishimoto, Yasuaki

The ion temperature gradient driven (ITG) mode in reversed shear tokamaks is analyzed using a gyrokinetic toroidal particle code. It is found that the ITG mode in the reversed shear configuration shows a coupled mode structure between the slab and toroidal ITG modes. Especially in the $$q_{min}$$ region, a slab like feature due to the reversed shear slab ITG mode becomes strong. This coupled eigenmode structure is changed from a slab mode to a toroidal mode depending on $$eta_i=L_n/L_{ti}$$ and $$L_{ti}$$. Results show that in reversed shear tokamaks, the ITG mode is determined from a competition between the slab and toroidal ITG modes.

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