ANOMALOUS ION THERMAL CONDUCTIVITY INDUCED BY ▽T_i INSTABILITY

The stability properties of ion temperature gradient instability are studied analytically in both weak and strong ballooning limits for toroidal geometry. The local anomalous ion thermal conductivity X_i is obtained. The scaling of this conductivity under slab approximation is consistent with the results given by Connor et al. The toroidal effects contribute an additional Pfirsch-Schlüter factor ( l+2q²)^3/4 to the conductivity.